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Norman Maurer 3c8c7fc7e9 Reduce performance overhead of ResourceLeakDetector
Motiviation:

The ResourceLeakDetector helps to detect and troubleshoot resource leaks and is often used even in production enviroments with a low level. Because of this its import that we try to keep the overhead as low as overhead. Most of the times no leak is detected (as all is correctly handled) so we should keep the overhead for this case as low as possible.

Modifications:

- Only call getStackTrace() if a leak is reported as it is a very expensive native call. Also handle the filtering and creating of the String in a lazy fashion
- Remove the need to mantain a Queue to store the last access records
- Add benchmark

Result:

Huge decrease of performance overhead.

Before the patch:

Benchmark                                           (recordTimes)   Mode  Cnt     Score     Error  Units
ResourceLeakDetectorRecordBenchmark.record                      8  thrpt   20  4358.367 ± 116.419  ops/s
ResourceLeakDetectorRecordBenchmark.record                     16  thrpt   20  2306.027 ±  55.044  ops/s
ResourceLeakDetectorRecordBenchmark.recordWithHint              8  thrpt   20  4220.979 ± 114.046  ops/s
ResourceLeakDetectorRecordBenchmark.recordWithHint             16  thrpt   20  2250.734 ±  55.352  ops/s

With this patch:

Benchmark                                           (recordTimes)   Mode  Cnt      Score      Error  Units
ResourceLeakDetectorRecordBenchmark.record                      8  thrpt   20  71398.957 ± 2695.925  ops/s
ResourceLeakDetectorRecordBenchmark.record                     16  thrpt   20  38643.963 ± 1446.694  ops/s
ResourceLeakDetectorRecordBenchmark.recordWithHint              8  thrpt   20  71677.882 ± 2923.622  ops/s
ResourceLeakDetectorRecordBenchmark.recordWithHint             16  thrpt   20  38660.176 ± 1467.732  ops/s
2017-09-18 16:36:19 -07:00
.github Use GitHub Issue/PR Template Feature 2016-12-07 11:40:26 -08:00
all Correctly filter out native tcnative lib 2017-09-18 11:43:17 -07:00
bom [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
buffer Enable PooledByteBufAllocator to work, event without a cache 2017-09-08 10:20:45 +02:00
codec Use offset finding eol avoid repeated scaning. 2017-09-17 09:17:38 -07:00
codec-dns [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
codec-haproxy [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
codec-http HttpObjectEncoder buffer size estimation 2017-08-31 01:40:53 -07:00
codec-http2 Fix NPE in InboundHttp2ToHttpAdapter 2017-09-17 09:07:11 -07:00
codec-memcache [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
codec-mqtt MQTT encode doesn't complain if password is set but username not 2017-09-14 09:37:37 -07:00
codec-redis [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
codec-smtp [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
codec-socks DefaultSocks5CommandRequest incorrectly rejects SOCKS5 commands with dstPort=0 2017-08-29 15:03:09 +02:00
codec-stomp Fix StompSubframeDecoder.readHeaders produce not any notification when parsed line that contains multiple colon 2017-08-29 22:06:45 +02:00
codec-xml [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
common Reduce performance overhead of ResourceLeakDetector 2017-09-18 16:36:19 -07:00
dev-tools [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
example [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
handler Only load native transport if running architecture match the compiled library architecture. 2017-09-04 13:34:55 +02:00
handler-proxy [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
license Remove reference to akka code and ArrayDeque which is not part of netty anymore 2017-03-07 21:30:51 +01:00
microbench Reduce performance overhead of ResourceLeakDetector 2017-09-18 16:36:19 -07:00
resolver [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
resolver-dns [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
tarball [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
testsuite Fix assertion error when closing / shutdown native channel and SO_LINGER is set. 2017-09-18 14:46:37 -07:00
testsuite-autobahn [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
testsuite-osgi [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
transport Fix assertion error when closing / shutdown native channel and SO_LINGER is set. 2017-09-18 14:46:37 -07:00
transport-native-epoll Fix assertion error when closing / shutdown native channel and SO_LINGER is set. 2017-09-18 14:46:37 -07:00
transport-native-kqueue Fix assertion error when closing / shutdown native channel and SO_LINGER is set. 2017-09-18 14:46:37 -07:00
transport-native-unix-common [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
transport-native-unix-common-tests [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
transport-rxtx Remove @Deprecated from package-info.java as intellij not likes it 2017-09-18 13:44:22 -07:00
transport-sctp [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
transport-udt [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
.fbprefs Updated Find Bugs configuration 2009-03-04 10:33:09 +00:00
.gitignore Use shaded dependency on JCTools instead of copy and paste 2016-06-10 13:19:45 +02:00
.travis.yml Travis CI branch whitelisting 2013-03-11 09:55:43 +09:00
CONTRIBUTING.md Move the pull request guide to the developer guide 2014-03-12 13:13:58 +09:00
LICENSE.txt Relicensed to Apache License v2 2009-08-28 07:15:49 +00:00
NOTICE.txt Remove reference to akka code and ArrayDeque which is not part of netty anymore 2017-03-07 21:30:51 +01:00
pom.xml [maven-release-plugin] prepare for next development iteration 2017-08-24 15:38:22 +02:00
README.md Updating Branches to look section to match the current branching structure of the project 2016-03-10 22:08:01 +01:00
run-example.sh Add UptimeServer and adjust UptimeClient's code style. 2017-04-28 07:41:07 +02:00

Netty Project

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients.

How to build

For the detailed information about building and developing Netty, please visit the developer guide. This page only gives very basic information.

You require the following to build Netty:

Note that this is build-time requirement. JDK 5 (for 3.x) or 6 (for 4.0+) is enough to run your Netty-based application.

Branches to look

Development of all versions takes place in each branch whose name is identical to <majorVersion>.<minorVersion>. For example, the development of 3.9 and 4.0 resides in the branch '3.9' and the branch '4.0' respectively.