Commit Graph

858 Commits

Author SHA1 Message Date
Norman Maurer
c14efd952d
Directly init refCnt to 1 (#8274)
Motivation:

We should just directly init the refCnt to 1 and not use the AtomicIntegerFieldUpdater.

Modifications:

Just assing directly to 1.

Result:

Cleaner code and possible a bit faster as the JVM / JIT may be able to optimize the first store easily.
2018-09-07 19:04:19 +02:00
Norman Maurer
e542a2cf26
Use a non-volatile read for ensureAccessible() whenever possible to reduce overhead and allow better inlining. (#8266)
Motiviation:

At the moment whenever ensureAccessible() is called in our ByteBuf implementations (which is basically on each operation) we will do a volatile read. That per-se is not such a bad thing but the problem here is that it will also reduce the the optimizations that the compiler / jit can do. For example as these are volatile it can not eliminate multiple loads of it when inline the methods of ByteBuf which happens quite frequently because most of them a quite small and very hot. That is especially true for all the methods that act on primitives.

It gets even worse as people often call a lot of these after each other in the same method or even use method chaining here.

The idea of the change is basically just ue a non-volatile read for the ensureAccessible() check as its a best-effort implementation to detect acting on already released buffers anyway as even with a volatile read it could happen that the user will release it in another thread before we actual access the buffer after the reference check.

Modifications:

- Try to do a non-volatile read using sun.misc.Unsafe if we can use it.
- Add a benchmark

Result:

Big performance win when multiple ByteBuf methods are called from a method.

With the change:
UnsafeByteBufBenchmark.setGetLongUnsafeByteBuf  thrpt   20  281395842,128 ± 5050792,296  ops/s

Before the change:
UnsafeByteBufBenchmark.setGetLongUnsafeByteBuf  thrpt   20  217419832,801 ± 5080579,030  ops/s
2018-09-07 07:47:02 +02:00
Francesco Nigro
c78be33443 Added configurable ByteBuf bounds checking (#7521)
Motivation:

The JVM isn't always able to hoist out/reduce bounds checking (due to ref counting operations etc etc) hence making it configurable could improve performances for most CPU intensive use cases.

Modifications:

Each AbstractByteBuf bounds check has been tested against a new static final configuration property similar to checkAccessible ie io.netty.buffer.bytebuf.checkBounds.

Result:

Any user could disable ByteBuf bounds checking in order to get extra performances.
2018-09-03 20:33:47 +02:00
Norman Maurer
54f565ac67
Allow to use native transports when sun.misc.Unsafe is not present on… (#8231)
* Allow to use native transports when sun.misc.Unsafe is not present on the system

Motivation:

We should be able to use the native transports (epoll / kqueue) even when sun.misc.Unsafe is not present on the system. This is especially important as Java11 will be released soon and does not allow access to it by default.

Modifications:

- Correctly disable usage of sun.misc.Unsafe when -PnoUnsafe is used while running the build
- Correctly increment metric when UnpooledDirectByteBuf is allocated. This was uncovered once -PnoUnsafe usage was fixed.
- Implement fallbacks in all our native transport code for when sun.misc.Unsafe is not present.

Result:

Fixes https://github.com/netty/netty/issues/8229.
2018-08-29 19:36:33 +02:00
root
a580dc7585 [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
root
3fc789e83f [maven-release-plugin] prepare release netty-4.1.29.Final 2018-08-24 06:36:06 +00:00
vincent-grosbois
0bea8ecf5d CompositeByteBuf nioBuffer doesn't always alloc (#8176)
In nioBuffer(int,int) in CompositeByteBuf , we create a sub-array of nioBuffers for the components that are in range, then concatenate all the components in range into a single bigger buffer.
However, if the call to nioBuffers() returned only one sub-buffer, then we are copying it to a newly-allocated buffer "merged" for no reason.

Motivation:

Profiler for Spark shows a lot of time spent in put() method inside nioBuffer(), while usually no copy of data is required.

Modification:
This change skips this last step and just returns a duplicate of the single buffer returned by the call to nioBuffers(), which will in most implementation not copy the data

Result:
No copy when the source is only 1 buffer
2018-08-07 11:31:24 +02:00
root
fcb19cb589 [maven-release-plugin] prepare for next development iteration 2018-07-27 04:59:28 +00:00
root
ff785fbe39 [maven-release-plugin] prepare release netty-4.1.28.Final 2018-07-27 04:59:06 +00:00
Norman Maurer
9b08dbca00
Leak detection combined with composite buffers results in incorrectly handled writerIndex when calling ByteBufUtil.writeAscii/writeUtf8 (#8153)
Motivation:

We need to add special handling for WrappedCompositeByteBuf as these also extend AbstractByteBuf, otherwise we will not correctly adjust / read the writerIndex during processing.

Modifications:

- Add instanceof checks for WrappedCompositeByteBuf as well.
- Add testcases

Result:

Fixes https://github.com/netty/netty/issues/8152.
2018-07-27 01:56:09 +08:00
root
b4dbdc2036 [maven-release-plugin] prepare for next development iteration 2018-07-11 15:37:40 +00:00
root
1c16519ac8 [maven-release-plugin] prepare release netty-4.1.27.Final 2018-07-11 15:37:21 +00:00
root
7bb9e7eafe [maven-release-plugin] prepare for next development iteration 2018-07-10 05:21:24 +00:00
root
8ca5421bd2 [maven-release-plugin] prepare release netty-4.1.26.Final 2018-07-10 05:18:13 +00:00
Norman Maurer
6afab517b0
Guard against calling PoolThreadCache.free() multiple times. (#8108)
Motivation:

5b1fe611a6 introduced the usage of a finalizer as last resort for PoolThreadCache. As we may call free() from the FastThreadLocal.onRemoval(...) and finalize() we need to guard against multiple calls as otherwise we will corrupt internal state (that is used for metrics).

Modifications:

Use AtomicBoolean to guard against multiple calls of PoolThreadCache.free().

Result:

No more corruption of internal state caused by calling PoolThreadCache.free() multuple times.
2018-07-09 15:58:12 -04:00
Nick Hill
fef462c043 Deprecate Unpooled.unmodifiableBuffer(ByteBuf...) (#8096)
Motivation:

Recent PR https://github.com/netty/netty/pull/8040 introduced
Unpooled.wrappedUnmodifiableBuffer(ByteBuf...) which has the same
behaviour but wraps the provided array directly. This is preferred for
most uses (including varargs-based use) and if there are any unusual
cases of an explicit array which is re-used before the ByteBuf is
finished with, it can just be copied first.

Modifications:

Added @Deprecated annotation and javadoc to
Unpooled.unmodifiableBuffer(ByteBuf...).

Result:

Unpooled.unmodifiableBuffer(ByteBuf...) will be deprecated.
2018-07-07 14:45:27 -04:00
Norman Maurer
83710cb2e1
Replace toArray(new T[size]) with toArray(new T[0]) to eliminate zero-out and allow the VM to optimize. (#8075)
Motivation:

Using toArray(new T[0]) is usually the faster aproach these days. We should use it.

See also https://shipilev.net/blog/2016/arrays-wisdom-ancients/#_conclusion.

Modifications:

Replace toArray(new T[size]) with toArray(new T[0]).

Result:

Faster code.
2018-06-29 07:56:04 +02:00
Norman Maurer
5b1fe611a6
Remove usage of ObjectCleaner (#8064)
Motivation:

ObjectCleaner does start a Thread to handle the cleaning of resources which leaks into the users application. We should not use it in netty itself to make things more predictable.

Modifications:

- Remove usage of ObjectCleaner and use finalize as a replacement when possible.
- Clarify javadocs for FastThreadLocal.onRemoval(...) to ensure its clear that remove() is not guaranteed to be called when the Thread completees and so this method is not enough to guarantee cleanup for this case.

Result:

Fixes https://github.com/netty/netty/issues/8017.
2018-06-28 08:15:27 +02:00
nickhill
f164759ea3 Support composite buffer creation without array alloc and copy
Motivation:

Unpooled.unmodifiableBuffer() is currently used to efficiently write
arrays of ByteBufs via FixedCompositeByteBuf, but involves an allocation
and content-copy of the provided ByteBuf array which in many (most?)
cases shouldn't be necessary.

Modifications:

Modify the internal FixedCompositeByteBuf class to support wrapping the
provided ByteBuf array directly. Control this behaviour with a
constructor flag and expose the "unsafe" version via a new
Unpooled.wrappedUnmodifiableBuffer(ByteBuf...) method.

Result:

Less garbage on IO paths. I would guess pretty much all existing usage
of unmodifiableBuffer() could use the copy-free version but assume it's
not safe to change its default behaviour.
2018-06-27 07:40:14 +02:00
nickhill
9b95b8ee62 Reduce array allocations during CompositeByteBuf construction
Motivation:

Eliminate avoidable backing array reallocations when constructing
composite ByteBufs from existing buffer arrays/Iterables. This also
applies to the Unpooled.wrappedBuffer(...) methods.

Modifications:

Ensure the initial components ComponentList is sized at least as large
as the provided buffer array/Iterable in the CompositeByteBuffer
constructors.

In single-arg Unpooled.wrappedBuffer(...) methods, set maxNumComponents
to the count of provided buffers, rather than a fixed default of 16. It
seems likely that most usage of these involves wrapping a list without
subsequent modification, particularly since they return a ByteBuf rather
than CompositeByteBuf. If a different/larger max is required there are
already the wrappedBuffer(int, ...) variants.

In fact the current behaviour could be considered inconsistent - if you
call Unpooled.wrappedBuffer(int, ByteBuf) with a single buffer, you
might expect to subsequently be able to add buffers to it (since you
specified a max related to consolidation), but it will in fact return
just a slice of the provided ByteBuf.

Result:

Fewer and smaller allocations in some cases when using CompositeByteBufs
or Unpooled.wrappedBuffer(...).
2018-06-20 16:09:23 +02:00
Tim Brooks
35215309b9 Make UnpooledHeapByteBuf array methods protected (#8015)
Motivation:

Currently there is not a clear way to provide a byte array to a netty
ByteBuf and be informed when it is released. This is a would be a
valuable addition for projects that integrate with netty but also pool
their own byte arrays.

Modification:

Modified the UnpooledHeapByteBuf class so that the freeArray method is
protected visibility instead of default. This will allow a user to
subclass the UnpooledHeapByteBuf, provide a byte array, and override
freeArray to return the byte array to a pool when it is called.
Additionally this makes this implementation equivalent to
UnpooledDirectByteBuf (freeDirect is protected).

Additionally allocateArray is also made protect to provide another override
option for subclasses.

Result:

Users can override UnpooledHeapByteBuf#freeArray and
UnpooledHeapByteBuf#allocateArray.
2018-06-13 11:43:31 -07:00
zekaryu
09d9daf1c4 Update the comment of io.netty.buffer.PoolChunk.java (#7934)
Motivation:

When I read the source code, I found that the comment of PoolChunk is out of date, it may confuses readers with the description about memoryMap.

Modifications:

update the last passage of the comment of the PoolChunk class.

Result:
No change to any source code , just update comment.
2018-05-14 15:44:32 +02:00
Norman Maurer
64bb279f47 [maven-release-plugin] prepare for next development iteration 2018-05-14 11:11:45 +00:00
Norman Maurer
c67a3b0507 [maven-release-plugin] prepare release netty-4.1.25.Final 2018-05-14 11:11:24 +00:00
Xiaoyan Lin
a0ed6ec06c Fix the error message in ReferenceCounted.release (#7921)
Motivation:

When a buffer is over-released, the current error message of `IllegalReferenceCountException` is `refCnt: XXX, increment: XXX`, which is confusing. The correct message should be `refCnt: XXX, decrement: XXX`.

Modifications:

Pass `-decrement` to create `IllegalReferenceCountException`.

Result:

The error message will be `refCnt: XXX, decrement: XXX` when a buffer is over-released.
2018-05-08 20:09:16 +02:00
Rikki Gibson
1b1f7677ac Implement isWritable and ensureWritable on ReadOnlyByteBufferBuf (#7883)
Motivation:

It should be possible to write a ReadOnlyByteBufferBuf to a channel without errors. However, ReadOnlyByteBufferBuf does not override isWritable and ensureWritable, which can cause some handlers to mistakenly assume they can write to the ReadOnlyByteBufferBuf, resulting in ReadOnlyBufferException.

Modification:

Added isWritable and ensureWritable method overrides on ReadOnlyByteBufferBuf to indicate that it is never writable. Added tests for these methods.

Result:

Can successfully write ReadOnlyByteBufferBuf to a channel with an SslHandler (or any other handler which may attempt to write to the ByteBuf it receives).
2018-04-23 08:31:30 +02:00
Norman Maurer
b75f44db9a [maven-release-plugin] prepare for next development iteration 2018-04-19 11:56:07 +00:00
Norman Maurer
04fac00c8c [maven-release-plugin] prepare release netty-4.1.24.Final 2018-04-19 11:55:47 +00:00
Nikolay Fedorovskikh
81a7d1413b Makes EmptyByteBuf#hashCode and AbstractByteBuf#hashCode consistent (#7870)
Motivation:
The `AbstractByteBuf#equals` method doesn't take into account the
class of buffer instance. So the two buffers with different classes
must have the same `hashCode` values if `equals` method returns `true`.
But `EmptyByteBuf#hashCode` is not consistent with `#hashCode`
of the empty `AbstractByteBuf`, that is violates the contract and
can lead to errors.

Modifications:
Return `1` in `EmptyByteBuf#hashCode`.

Result:
Consistent behavior of `EmptyByteBuf#hashCode` and `AbstractByteBuf#hashCode`.
2018-04-16 12:11:42 +02:00
Nikolay Fedorovskikh
f8ff834f03 Checks accessibility in the #slice and #duplicate methods of ByteBuf (#7846)
Motivation:
The `ByteBuf#slice` and `ByteBuf#duplicate` methods should check
an accessibility to prevent creation slice or duplicate
of released buffer. At now this works not in the all scenarios.

Modifications:
Add missed checks.

Result:
More correct and consistent behavior of `ByteBuf` methods.
2018-04-10 10:41:50 +02:00
root
0a61f055f5 [maven-release-plugin] prepare for next development iteration 2018-04-04 10:44:46 +00:00
root
8c549bad38 [maven-release-plugin] prepare release netty-4.1.23.Final 2018-04-04 10:44:15 +00:00
Nikolay Fedorovskikh
a95fd91bc6 Don't check accessible in the #capacity method (#7830)
Motivation:
The `#ensureAccessible` method in `UnpooledHeapByteBuf#capacity` used
to prevent NPE if buffer is released and `array` is `null`. In all
other implementations of `ByteBuf` the accessible is not checked by
`capacity` method. We can assign an empty array to `array`
in the `deallocate` and don't worry about NPE in the `#capacity`.
This will help reduce the number of repeated calls of the
`#ensureAccessible` in many operations with `UnpooledHeapByteBuf`.

Modifications:
1. Remove `#ensureAccessible` call from `UnpooledHeapByteBuf#capacity`.
Use the `EmptyArrays#EMPTY_BYTES` instead of `null` in `#deallocate`.

2. Fix access checks in `AbstractUnsafeSwappedByteBuf` and
`AbstractByteBuf#slice` that relied on `#ensureAccessible`
in `UnpooledHeapByteBuf#capacity`. This was found by unit tests.

Result:
Less double calls of `#ensureAccessible` for `UnpooledHeapByteBuf`.
2018-04-03 21:35:02 +02:00
Norman Maurer
965734a1eb
Limit the number of bytes to use to copy the content of a direct buffer to an Outputstream (#7813)
Motivation:

Currently copying a direct ByteBuf copies it fully into the heap before writing it to an output stream.
The can result in huge memory usage on the heap.

Modification:

copy the bytebuf contents via an 8k buffer into the output stream

Result:

Fixes #7804
2018-03-29 12:49:27 +02:00
Norman Maurer
bd772d127e FixedCompositeByteBuf should allow to access memoryAddress / array when wrap a single buffer.
Motivation:

We should allow to access the memoryAddress / array of the FixedCompositeByteBuf when it only wraps a single ByteBuf. We do the same for CompositeByteBuf.

Modifications:

- Check how many buffers FixedCompositeByteBuf wraps and depending on it delegate the access to the memoryAddress / array
- Add unit tests.

Result:

Fixes [#7752].
2018-03-13 08:50:42 +01:00
kakashiio
12ccd40c5a Correctly throw IndexOutOfBoundsException when writerIndex < readerIndex
Motivation:

If someone invoke writeByte(), markWriterIndex(), readByte() in order first, and then invoke resetWriterIndex() should be throw a IndexOutOfBoundsException to obey the rule that the buffer declared "0 <= readerIndex <= writerIndex <= capacity".

Modification:

Changed the code writerIndex = markedWriterIndex; into writerIndex(markedWriterIndex); to make the check affect

Result:
Throw IndexOutOfBoundsException if any invalid happened in resetWriterIndex.
2018-03-02 10:05:33 +09:00
Francesco Nigro
ed46c4ed00 Copies from read-only heap ByteBuffer to direct ByteBuf can avoid stealth ByteBuf allocation and additional copies
Motivation:

Read-only heap ByteBuffer doesn't expose array: the existent method to perform copies to direct ByteBuf involves the creation of a (maybe pooled) additional heap ByteBuf instance and copy

Modifications:

To avoid stressing the allocator with additional (and stealth) heap ByteBuf allocations is provided a method to perform copies using the (pooled) internal NIO buffer

Result:

Copies from read-only heap ByteBuffer to direct ByteBuf won't create any intermediate ByteBuf
2018-02-27 09:54:21 +09:00
Norman Maurer
69582c0b6c [maven-release-plugin] prepare for next development iteration 2018-02-21 12:52:33 +00:00
Norman Maurer
786f35c6c9 [maven-release-plugin] prepare release netty-4.1.22.Final 2018-02-21 12:52:19 +00:00
Francesco Nigro
bc8e022601 Added exact utf8 length estimator and exposed writeUtf8 with custom space reservation on destination buffer
Motivation:

To avoid eager allocation of the destination and to perform length prefixed encoding of UTF-8 string with forward only access pattern

Modifications:

The original writeUtf8 is modified by allowing customization of the reserved bytes on the destination buffer and is introduced an exact UTF-8 length estimator.

Result:

Is now possible to perform length first encoding with UTF-8 well-formed char sequences following a forward only write access pattern on the destination buffer.
2018-02-16 11:52:35 +01:00
Scott Mitchell
108fbe5282
ByteBufUtil to not pool direct memory by default
Motivation:
ByteBufUtil by default will cache DirectByteBuffer objects, and the
associated direct memory (up to 64k). In combination with the Recycler which may
cache up to 32k elements per thread may lead to a large amount of direct
memory being retained per EventLoop thread. As traffic spikes come this
may be perceived as a memory leak because the memory in the Recycler
will never be reclaimed.

Modifications:
- By default we shouldn't cache DirectByteBuffer objects.

Result:
Less direct memory consumption due to caching DirectByteBuffer objects.
2018-02-12 10:49:17 -08:00
Norman Maurer
e71fa1e7b6 [maven-release-plugin] prepare for next development iteration 2018-02-05 12:02:35 +00:00
Norman Maurer
41ebb5fcca [maven-release-plugin] prepare release netty-4.1.21.Final 2018-02-05 12:02:19 +00:00
Norman Maurer
fbbaf2bd7e Cleanup buffer tests.
Motivation:

There is some cleanup that can be done.

Modifications:

- Use intializer list expression where possible
- Remove unused imports.

Result:

Cleaner code.
2018-02-02 07:33:46 +01:00
Norman Maurer
011841e454 ReadOnlyUnsafeDirectByteBuf.memoryAddress() should not throw
Motivation:

We need the memoryAddress of a direct buffer when using our native transports. For this reason ReadOnlyUnsafeDirectByteBuf.memoryAddress() should not throw.

Modifications:

- Correctly override ReadOnlyUnsafeDirectByteBuf.memoryAddress() and hasMemoryAddress()
- Add test case

Result:

Fixes [#7672].
2018-02-02 07:27:26 +01:00
Norman Maurer
95b9b0af5c Increase timeout and decrement number of operations in AbstractByteBufTest.testToStringMultipleThreads
Motivation:

We saw some timeouts on the CI when the leak detection is enabled.

Modifications:

- Use smaller number of operations in test
- Increase timeout

Result:

CI not times out.
2018-01-31 14:57:38 +01:00
Norman Maurer
d2bd36fc4c ByteBufUtil.isText method should be safe to be called concurrently
Motivation:

ByteBufUtil.isText(...) may produce unexpected results if called concurrently on the same ByteBuffer.

Modifications:

- Don't use internalNioBuffer where it is not safe.
- Add unit test.

Result:

ByteBufUtil.isText is thread-safe.
2018-01-31 13:47:49 +01:00
Scott Mitchell
4921f62c8a
HttpResponseStatus object allocation reduction
Motivation:
Usages of HttpResponseStatus may result in more object allocation then necessary due to not looking for cached objects and the AsciiString parsing method not being used due to CharSequence method being used instead.

Modifications:
- HttpResponseDecoder should attempt to get the HttpResponseStatus from cache instead of allocating a new object
- HttpResponseStatus#parseLine(CharSequence) should check if the type is AsciiString and redirect to the AsciiString parsing method which may not require an additional toString call
- HttpResponseStatus#parseLine(AsciiString) can be optimized and doesn't require and may not require object allocation

Result:
Less allocations when dealing with HttpResponseStatus.
2018-01-24 22:01:52 -08:00
Norman Maurer
336bea9dc5 Fix ByteBuf.nioBuffer(...) and nioBuffers(...) docs to reflect reality.
Motivation:

Depending on the implementation of ByteBuf nioBuffer(...) and nioBuffers(...) may either share the content or return a ByteBuffer that contains a copy of the content.

Modifications:

Fix javadocs.

Result:

Correct docs.
2018-01-22 19:50:08 +01:00
Norman Maurer
ea58dc7ac7 [maven-release-plugin] prepare for next development iteration 2018-01-21 12:53:51 +00:00
Norman Maurer
96c7132dee [maven-release-plugin] prepare release netty-4.1.20.Final 2018-01-21 12:53:34 +00:00
Thomas Devanneaux
3ae57cf302 ByteBuf.toString(Charset) is not thread-safe
Motivation:

Calling ByteBuf.toString(Charset) on the same buffer from multiple threads at the same time produces unexpected results, such as various exceptions and/or corrupted output. This is because ByteBufUtil.decodeString(...) is taking the source ByteBuffer for CharsetDecoder.decode() from ByteBuf.internalNioBuffer(int, int), which is not thread-safe.

Modification:

Call ByteBuf.nioBuffer() instead of ByteBuf.internalNioBuffer() to get the source buffer to pass to CharsetDecoder.decode().

Result:

Fixes the possible race condition.
2018-01-21 09:02:42 +01:00
Norman Maurer
819b870b8a Correctly take position into account when wrap a ByteBuffer via ReadOnlyUnsafeDirectByteBuf
Motivation:

We did not correctly take the position into account when wrapping a ByteBuffer via ReadOnlyUnsafeDirectByteBuf as we obtained the memory address from the original ByteBuffer and not the slice we take.

Modifications:

- Correctly use the slice to obtain memory address.
- Add test case.

Result:

Fixes [#7565].
2018-01-16 19:18:59 +01:00
Norman Maurer
e329ca1cf3 Introduce ObjectCleaner and use it in FastThreadLocal to ensure FastThreadLocal.onRemoval(...) is called
Motivation:

There is no guarantee that FastThreadLocal.onRemoval(...) is called if the FastThreadLocal is used by "non" FastThreacLocalThreads. This can lead to all sort of problems, like for example memory leaks as direct memory is not correctly cleaned up etc.

Beside this we use ThreadDeathWatcher to check if we need to release buffers back to the pool when thread local caches are collected. In the past ThreadDeathWatcher was used which will need to "wakeup" every second to check if the registered Threads are still alive. If we can ensure FastThreadLocal.onRemoval(...) is called we do not need this anymore.

Modifications:

- Introduce ObjectCleaner and use it to ensure FastThreadLocal.onRemoval(...) is always called when a Thread is collected.
- Deprecate ThreadDeathWatcher
- Add unit tests.

Result:

Consistent way of cleanup FastThreadLocals when a Thread is collected.
2017-12-21 07:34:44 +01:00
Norman Maurer
264a5daa41 [maven-release-plugin] prepare for next development iteration 2017-12-15 13:10:54 +00:00
Norman Maurer
0786c4c8d9 [maven-release-plugin] prepare release netty-4.1.19.Final 2017-12-15 13:09:30 +00:00
Norman Maurer
1988cd041d Reduce Object allocations in CompositeByteBuf.
Motivation:

We used subList in CompositeByteBuf to remove ranges of elements from the internal storage. Beside this we also used an foreach loop in a few cases which will crate an Iterator.

Modifications:

- Use our own sub-class of ArrayList which exposes removeRange(...). This allows to remove a range of elements without an extra allocation.
- Use an old style for loop to iterate over the elements to reduce object allocations.

Result:

Less allocations.
2017-12-12 09:08:58 +01:00
Norman Maurer
b2bc6407ab [maven-release-plugin] prepare for next development iteration 2017-12-08 09:26:15 +00:00
Norman Maurer
96732f47d8 [maven-release-plugin] prepare release netty-4.1.18.Final 2017-12-08 09:25:56 +00:00
Tomasz Jędrzejewski
e8540c2b7a Adding stable JDK9 module names that follow reverse-DNS style
Automatic-Module-Name entry provides a stable JDK9 module name, when Netty is used in a modular JDK9 applications. More info: http://blog.joda.org/2017/05/java-se-9-jpms-automatic-modules.html

When Netty migrates to JDK9 in the future, the entry can be replaced by actual module-info descriptor.

Modification:

The POM-s are configured to put the correct module names to the manifest.

Result:

Fixes #7218.
2017-11-29 11:50:24 +01:00
Norman Maurer
09a05b680d Dont use ThreadDeathWatcher to cleanup PoolThreadCache if FastThreadLocalThread with wrapped Runnable is used
Motivation:

We dont need to use the ThreadDeathWatcher if we use a FastThreadLocalThread for which we wrap the Runnable and ensure we call FastThreadLocal.removeAll() once the Runnable completes.

Modifications:

- Dont use a ThreadDeathWatcher if we are sure we will call FastThreadLocal.removeAll()
- Add unit test.

Result:

Less overhead / running theads if you only allocate / deallocate from FastThreadLocalThreads.
2017-11-28 13:43:28 +01:00
Scott Mitchell
a8bb9dc180 AbstractByteBuf readSlice bound check bug
Motivation:
AbstractByteBuf#readSlice relied upon the bounds checking of the slice operation in order to detect index out of bounds conditions. However the slice bounds checking operation allows for the slice to go beyond the writer index, and this is out of bounds for a read operation.

Modifications:
- AbstractByteBuf#readSlice and AbstractByteBuf#readRetainedSlice should ensure the desired amount of bytes are readable before taking a slice

Result:
No reading of undefined data in AbstractByteBuf#readSlice and AbstractByteBuf#readRetainedSlice.
2017-11-18 09:03:42 +01:00
Norman Maurer
cc069722a2 CompositeBytebuf.copy() and copy(...) should respect the allocator
Motivation:

When calling CompositeBytebuf.copy() and copy(...) we currently use Unpooled to allocate the buffer. This is not really correct and may produce more GC then needed. We should use the allocator that was used when creating the CompositeByteBuf to allocate the new buffer which may be for example the PooledByteBufAllocator.

Modifications:

- Use alloc() to allocate the new buffer.
- Add tests
- Fix tests that depend on the copy to be backed by an byte-array without checking hasArray() first.

Result:

Fixes [#7393].
2017-11-10 07:17:16 -08:00
Norman Maurer
188ea59c9d [maven-release-plugin] prepare for next development iteration 2017-11-08 22:36:53 +00:00
Norman Maurer
812354cf1f [maven-release-plugin] prepare release netty-4.1.17.Final 2017-11-08 22:36:33 +00:00
Idel Pivnitskiy
50a067a8f7 Make methods 'static' where it possible
Motivation:

Even if it's a super micro-optimization (most JVM could optimize such
 cases in runtime), in theory (and according to some perf tests) it
 may help a bit. It also makes a code more clear and allows you to
 access such methods in the test scope directly, without instance of
 the class.

Modifications:

Add 'static' modifier for all methods, where it possible. Mostly in
test scope.

Result:

Cleaner code with proper 'static' modifiers.
2017-10-21 14:59:26 +02:00
Nikolay Fedorovskikh
17e1a26d64 Fixes a javadoc for ByteBufUtil#copy method
Motivation:
Javadoc of the `ByteBufUtil#copy(AsciiString, int, ByteBuf, int, int)` is incorrect.

Modifications:
Fix it.

Result:
The description of the `#copy` method is not misleading.
2017-10-21 14:51:20 +02:00
Nikolay Fedorovskikh
09dd6a5d4d Minor improvements in ByteBufOutputStream
Motivation:
In the `ByteBufOutputStream` we can use an appropriate methods of `ByteBuf`
to reduce calls of virtual methods and do not copying converting logic.

Modifications:
- Use an appropriate methods of `ByteBuf`
- Remove redundant conversions (int -> byte, int -> char).
- Use `ByteBuf#writeCharSequence` in the `writeBytes(String)'.

Result:
Less code duplication. A `writeBytes(String)` method is faster.
No unnecessary conversions. More consistent and cleaner code.
2017-10-21 14:44:13 +02:00
Carl Mastrangelo
16b1dbdf92 Motivation: Resource Leak Detector (RLD) tries to helpfully indicate where an object was last accessed and report the accesses in the case the object was not cleaned up. It handles lightly used objects well, but drops all but the last few accesses.
Configuring this is tough because there is split between highly shared (and accessed) objects and lightly accessed objects.

Modification:
There are a number of changes here.  In relative order of importance:

API / Functionality changes:
* Max records and max sample records are gone.  Only "target" records, the number of records tries to retain is exposed.
* Records are sampled based on the number of already stored records.  The likelihood of recording a new sample is `2^(-n)`, where `n` is the number of currently stored elements.
* Records are stored in a concurrent stack structure rather than a list.  This avoids a head and tail.  Since the stack is only read once, there is no need to maintain head and tail pointers
* The properties of this imply that the very first and very last access are always recorded.  When deciding to sample, the top element is replaced rather than pushed.
* Samples that happen between the first and last accesses now have a chance of being recorded.  Previously only the final few were kept.
* Sampling is no longer deterministic.  Previously, a deterministic access pattern meant that you could conceivably always miss some access points.
* Sampling has a linear ramp for low values and and exponentially backs off roughly equal to 2^n.  This means that for 1,000,000 accesses, about 20 will actually be kept.  I have an elegant proof for this which is too large to fit in this commit message.

Code changes:
* All locks are gone.  Because sampling rarely needs to do a write, there is almost 0 contention.  The dropped records counter is slightly contentious, but this could be removed or changed to a LongAdder.  This was not done because of memory concerns.
* Stack trace exclusion is done outside of RLD.  Classes can opt to remove some of their methods.
* Stack trace exclusion is faster, since it uses String.equals, often getting a pointer compare due to interning.  Previously it used contains()
* Leak printing is outputted fairly differently.  I tried to preserve as much of the original formatting as possible, but some things didn't make sense to keep.

Result:
More useful leak reporting.

Faster:
```
Before:
Benchmark                                           (recordTimes)   Mode  Cnt       Score      Error  Units
ResourceLeakDetectorRecordBenchmark.record                      8  thrpt   20  136293.404 ± 7669.454  ops/s
ResourceLeakDetectorRecordBenchmark.record                     16  thrpt   20   72805.720 ± 3710.864  ops/s
ResourceLeakDetectorRecordBenchmark.recordWithHint              8  thrpt   20  139131.215 ± 4882.751  ops/s
ResourceLeakDetectorRecordBenchmark.recordWithHint             16  thrpt   20   74146.313 ± 4999.246  ops/s

After:
Benchmark                                           (recordTimes)   Mode  Cnt       Score      Error  Units
ResourceLeakDetectorRecordBenchmark.record                      8  thrpt   20  155281.969 ± 5301.399  ops/s
ResourceLeakDetectorRecordBenchmark.record                     16  thrpt   20   77866.239 ± 3821.054  ops/s
ResourceLeakDetectorRecordBenchmark.recordWithHint              8  thrpt   20  153360.036 ± 8611.353  ops/s
ResourceLeakDetectorRecordBenchmark.recordWithHint             16  thrpt   20   78670.804 ± 2399.149  ops/s
```
2017-10-19 12:21:21 -07:00
Carl Mastrangelo
83a19d5650 Optimistically update ref counts
Motivation:
Highly retained and released objects have contention on their ref
count.  Currently, the ref count is updated using compareAndSet
with care to make sure the count doesn't overflow, double free, or
revive the object.

Profiling has shown that a non trivial (~1%) of CPU time on gRPC
latency benchmarks is from the ref count updating.

Modification:
Rather than pessimistically assuming the ref count will be invalid,
optimistically update it assuming it will be.  If the update was
wrong, then use the slow path to revert the change and throw an
execption.  Most of the time, the ref counts are correct.

This changes from using compareAndSet to getAndAdd, which emits a
different CPU instruction on x86 (CMPXCHG to XADD).  Because the
CPU knows it will modifiy the memory, it can avoid contention.

On a highly contended machine, this can be about 2x faster.

There is a downside to the new approach.  The ref counters can
temporarily enter invalid states if over retained or over released.
The code does handle these overflow and underflow scenarios, but it
is possible that another concurrent access may push the failure to
a different location.  For example:

Time 1 Thread 1: obj.retain(INT_MAX - 1)
Time 2 Thread 1: obj.retain(2)
Time 2 Thread 2: obj.retain(1)

Previously Thread 2 would always succeed and Thread 1 would always
fail on the second access.  Now, thread 2 could fail while thread 1
is rolling back its change.

====

There are a few reasons why I think this is okay:

1. Buggy code is going to have bugs.  An exception _is_ going to be
   thrown.  This just causes the other threads to notice the state
   is messed up and stop early.
2. If high retention counts are a use case, then ref count should
   be a long rather than an int.
3. The critical section is greatly reduced compared to the previous
   version, so the likelihood of this happening is lower
4. On error, the code always rollsback the change atomically, so
   there is no possibility of corruption.

Result:
Faster refcounting

```
BEFORE:

Benchmark                                                                                             (delay)    Mode      Cnt         Score    Error  Units
AbstractReferenceCountedByteBufBenchmark.retainRelease_contended                                            1  sample  2901361       804.579 ±  1.835  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_contended                                           10  sample  3038729       785.376 ± 16.471  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_contended                                          100  sample  2899401       817.392 ±  6.668  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_contended                                         1000  sample  3650566      2077.700 ±  0.600  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_contended                                        10000  sample  3005467     19949.334 ±  4.243  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_uncontended                                          1  sample   456091        48.610 ±  1.162  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_uncontended                                         10  sample   732051        62.599 ±  0.815  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_uncontended                                        100  sample   778925       228.629 ±  1.205  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_uncontended                                       1000  sample   633682      2002.987 ±  2.856  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_uncontended                                      10000  sample   506442     19735.345 ± 12.312  ns/op

AFTER:
Benchmark                                                                                             (delay)    Mode      Cnt         Score    Error  Units
AbstractReferenceCountedByteBufBenchmark.retainRelease_contended                                            1  sample  3761980       383.436 ±  1.315  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_contended                                           10  sample  3667304       474.429 ±  1.101  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_contended                                          100  sample  3039374       479.267 ±  0.435  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_contended                                         1000  sample  3709210      2044.603 ±  0.989  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_contended                                        10000  sample  3011591     19904.227 ± 18.025  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_uncontended                                          1  sample   494975        52.269 ±  8.345  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_uncontended                                         10  sample   771094        62.290 ±  0.795  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_uncontended                                        100  sample   763230       235.044 ±  1.552  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_uncontended                                       1000  sample   634037      2006.578 ±  3.574  ns/op
AbstractReferenceCountedByteBufBenchmark.retainRelease_uncontended                                      10000  sample   506284     19742.605 ± 13.729  ns/op

```
2017-10-04 08:42:33 +02:00
回眸,境界
06da0ceb64 Fix typo in comment. 2017-10-02 08:16:22 +02:00
Norman Maurer
625a7426cd [maven-release-plugin] prepare for next development iteration 2017-09-25 06:12:32 +02:00
Norman Maurer
f57d8f00e1 [maven-release-plugin] prepare release netty-4.1.16.Final 2017-09-25 06:12:16 +02:00
Carl Mastrangelo
003c8cc7ab Expose all defaults on PooledByteBufAllocator
Motivation:
Most, but not all defaults are statically exposed on
PooledByteBufAllocator.  This makes it cumbersome to make a custom
allocator where most of the defaults remain the same.

Modification:
Expose useCacheForAllThreads, and Direct preferred.  The latter is
needed because it is under the internal package, and public code
should probably not depend on it.

Result:
More customizeable allocators
2017-09-20 21:48:53 -07:00
Norman Maurer
9d56439aa1 Make UnpooledDirectByteBuf, UnpooledHeapByteBuf and UnpooledUnsafeDirectByteBuf constructors public.
Motivation:

The constrcutors a protected atm but the classes are public. We should make the constructors public as well to make it easier to write your own ByteBufAllocator.

Modifications:

Change constructors to be public and add some javadocs.

Result:

Easier to create own ByteBufAllocator.
2017-09-18 21:42:46 -07:00
Carl Mastrangelo
d2cb51bc2e Enable PooledByteBufAllocator to work, event without a cache
Motivation:
`useCacheForAllThreads` may be false which disables memory caching
on non netty threads.  Setting this argument or the system property
makes it impossible to use `PooledByteBufAllocator`.

Modifications:

Delayed the check of `freeSweepAllocationThreshold` in
`PoolThreadCache` to after it knows there will be any caches in
use.  Additionally, check if the caches will have any data in them
(rather than allocating a 0-length array).

A test case is also added that fails without this change.

Results:

Fixes #7194
2017-09-08 10:20:45 +02:00
Norman Maurer
bca35b0449 Allow to construct UnpooledByteBufAllocator that explictly always use sun.misc.Cleaner
Motivation:

When the user want to have the direct memory explicitly managed by the GC (just as java.nio does) it is useful to be able to construct an UnpooledByteBufAllocator that allows this without the chances to see any memory leak.

Modifications:

Allow to explicitly disable the usage of reflection to construct direct ByteBufs and so be sure these will be collected by GC.

Result:

More flexible way to use the UnpooledByteBufAllocator.
2017-08-31 12:57:09 +02:00
Carl Mastrangelo
7528e5a11e Use threadsafe setter on Atomic Updaters
Motivation:
The documentation for field updates says:

> Note that the guarantees of the {@code compareAndSet}
> method in this class are weaker than in other atomic classes.
> Because this class cannot ensure that all uses of the field
> are appropriate for purposes of atomic access, it can
> guarantee atomicity only with respect to other invocations of
> {@code compareAndSet} and {@code set} on the same updater.

This implies that volatiles shouldn't use normal assignment; the
updater should set them.

Modifications:
Use setter for field updaters that make use of compareAndSet.

Result:
Concurrency compliant code
2017-08-31 10:14:40 +02:00
Norman Maurer
b967805f32 [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
Norman Maurer
da8e010a42 [maven-release-plugin] prepare release netty-4.1.15.Final 2017-08-24 15:37:59 +02:00
Norman Maurer
e487db7836 Use the ByteBufAllocator when copy a ReadOnlyByteBufferBuf and so also be able to release it without the GC when the Cleaner is present.
Motivation:

In ReadOnlyByteBufferBuf.copy(...) we just allocated a ByteBuffer directly and wrapped it. This way it was not possible for us to free the direct memory that was used by the copy without the GC.

Modifications:

- Ensure we use the allocator when create the copy and so be able to release direct memory in a timely manner
- Add unit test
- Depending on if the to be copied buffer is direct or heap based we also allocate the same type on copy.

Result:

Fixes [#7103].
2017-08-16 07:33:10 +02:00
Nikolay Fedorovskikh
0774c91456 Support the little endian floats and doubles by ByteBuf
Motivation:
`ByteBuf` does not have the little endian variant of float/double access methods.

Modifications:
Add support for little endian floats and doubles into `ByteBuf`.

Result:
`ByteBuf` has get/read/set/writeFloatLE() and get/read/set/writeDoubleLE() methods. Fixes [#6576].
2017-08-15 06:24:28 +02:00
louyl
8be9a63c1c FIX endless loop in ByteBufUtil#writeAscii
Motivation:

Missing return in ByteBufUtil#writeAscii causes endless loop

Modifications:

Add return after write finished

Result:

ByteBufUtil#writeAscii is ok
2017-08-12 12:50:00 +02:00
Norman Maurer
52f384b37f [maven-release-plugin] prepare for next development iteration 2017-08-02 12:55:10 +00:00
Norman Maurer
8cc1071881 [maven-release-plugin] prepare release netty-4.1.14.Final 2017-08-02 12:54:51 +00:00
Scott Mitchell
452fd36240 ByteBufs which are not resizable should not throw in ensureWritable(int,boolean)
Motivation:
ByteBuf#ensureWritable(int,boolean) returns an int indicating the status of the resize operation. For buffers that are unmodifiable or cannot be resized this method shouldn't throw but just return 1.
ByteBuf#ensureWriteable(int) should throw unmodifiable buffers.

Modifications:
- ReadOnlyByteBuf should be updated as described above.
- Add a unit test to SslHandler which verifies the read only buffer can be tolerated in the aggregation algorithm.

Result:
Fixes https://github.com/netty/netty/issues/7002.
2017-07-22 08:44:48 -07:00
Norman Maurer
06f64948d5 Add tests to ensure an IllegalReferenceCountException is thrown if set/writeCharSequence is called on a released buffer
Motivation:

We need to ensure we not allow calling set/writeCharsequence on an released ByteBuf.

Modifications:

Add test-cases

Result:

Proves fix of [#6951].
2017-07-21 07:39:32 +02:00
Norman Maurer
4af47f0ced AbstractByteBuf.setCharSequence(...) must not expand buffer
Motivation:

AbstractByteBuf.setCharSequence(...) must not expand the buffer if not enough writable space is present in the buffer to be consistent with all the other set operations.

Modifications:

- Ensure we only exand the buffer on writeCharSequence(...) but not on setCharSequence(...)
- Add unit tests.

Result:

Consistent and correct behavior.
2017-07-19 19:44:53 +02:00
Norman Maurer
d125adec38 AbstractByteBuf.ensureWritable(...) should check if buffer was released
Motivation:

AbstractByteBuf.ensureWritable(...) should check if buffer was released and if so throw an IllegalReferenceCountException

Modifications:

Ensure we throw in all cases.

Result:

More consistent and correct behaviour
2017-07-19 07:34:08 +02:00
louxiu
0ad99310f5 Record release when enable detailed leak detection
Motivation:
It would be easier to find where is missing release call in several retain release calls on a ByteBuf

Modifications:
Remove final modifier on SimpleLeakAwareByteBuf and SimpleLeakAwareByteBuf release function and override it to record release in AdvancedLeakAwareByteBuf and AdvancedLeakAwareCompositeByteBuf

Result:
Release will be recorded when enable detailed leak detection
2017-07-18 09:28:56 +02:00
Scott Mitchell
86e653e04f SslHandler aggregation of plaintext data on write
Motivation:
Each call to SSL_write may introduce about ~100 bytes of overhead. The OpenSslEngine (based upon OpenSSL) is not able to do gathering writes so this means each wrap operation will incur the ~100 byte overhead. This commit attempts to increase goodput by aggregating the plaintext in chunks of <a href="https://tools.ietf.org/html/rfc5246#section-6.2">2^14</a>. If many small chunks are written this can increase goodput, decrease the amount of calls to SSL_write, and decrease overall encryption operations.

Modifications:
- Introduce SslHandlerCoalescingBufferQueue in SslHandler which will aggregate up to 2^14 chunks of plaintext by default
- Introduce SslHandler#setWrapDataSize to control how much data should be aggregated for each write. Aggregation can be disabled by setting this value to <= 0.

Result:
Better goodput when using SslHandler and the OpenSslEngine.
2017-07-10 12:22:08 -07:00
Nikolay Fedorovskikh
df568c739e Use ByteBuf#writeShort/writeMedium instead of writeBytes
Motivation:

1. Some encoders used a `ByteBuf#writeBytes` to write short constant byte array (2-3 bytes). This can be replaced with more faster `ByteBuf#writeShort` or `ByteBuf#writeMedium` which do not access the memory.
2. Two chained calls of the `ByteBuf#setByte` with constants can be replaced with one `ByteBuf#setShort` to reduce index checks.
3. The signature of method `HttpHeadersEncoder#encoderHeader` has an unnecessary `throws`.

Modifications:

1. Use `ByteBuf#writeShort` or `ByteBuf#writeMedium` instead of `ByteBuf#writeBytes` for the constants.
2. Use `ByteBuf#setShort` instead of chained call of the `ByteBuf#setByte` with constants.
3. Remove an unnecessary `throws` from `HttpHeadersEncoder#encoderHeader`.

Result:

A bit faster writes constants into buffers.
2017-07-10 14:37:41 +02:00
Norman Maurer
83db2b07b4 Also use realloc when shrink the buffer.
Motivation:

We should also use realloc when shrink the buffer to eliminate extra allocations / memory copies when possible.

Modifications:

Use realloc for expanding and shrinking when possible.

Result:

Less memory copies and allocations
2017-07-06 20:03:15 +02:00
Norman Maurer
2a376eeb1b [maven-release-plugin] prepare for next development iteration 2017-07-06 13:24:06 +02:00
Norman Maurer
c7f8168324 [maven-release-plugin] prepare release netty-4.1.13.Final 2017-07-06 13:23:51 +02:00
Nikolay Fedorovskikh
f35047765f Avoid a double check ByteBuf#ensureWritable in ByteBufUtil
Motivation:

Methods `ByteBufUtil#writeUtf8` and `ByteBufUtil#writeAscii` contains a check `ByteBuf#ensureWritable` before the calling `ByteBuf#writeBytes`. But the `ByteBuf#writeBytes` also do a such check inside.

Modifications:

Make checks more targeted.

Result:

Less redundant method calls.
2017-06-28 19:00:01 +02:00
Nikolay Fedorovskikh
ba3616da3e Apply appropriate methods for writing CharSequence into ByteBuf
Motivation:

1. `ByteBuf` contains methods to writing `CharSequence` which optimized for UTF-8 and ASCII encodings. We can also apply optimization for ISO-8859-1.
2. In many places appropriate methods are not used.

Modifications:

1. Apply optimization for ISO-8859-1 encoding in the `ByteBuf#setCharSequence` realizations.
2. Apply appropriate methods for writing `CharSequences` into buffers.

Result:

Reduce overhead from string-to-bytes conversion.
2017-06-27 07:58:39 +02:00
Nikolay Fedorovskikh
01eb428b39 Move methods for decode hex dump into StringUtil
Motivation:

PR #6811 introduced a public utility methods to decode hex dump and its parts, but they are not visible from netty-common.

Modifications:

1. Move the `decodeHexByte`, `decodeHexDump` and `decodeHexNibble` methods into `StringUtils`.
2. Apply these methods where applicable.
3. Remove similar methods from other locations (e.g. `HpackHex` test class).

Result:

Less code duplication.
2017-06-23 18:52:42 +02:00
Norman Maurer
fd67a2354d [maven-release-plugin] prepare for next development iteration 2017-06-08 21:06:24 +02:00
Norman Maurer
3acd5c68ea [maven-release-plugin] prepare release netty-4.1.12.Final 2017-06-08 21:06:01 +02:00