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Relates issue: NETTY-18 (Performance degradation when Channel.write() is called from outside an I/O thread (NIO transport)

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* The bottleneck was too frequent wakeups.  I found that recent NIO implementations don't require wakeups to get / set interestOps.
This commit is contained in:
Trustin Lee 2008-08-19 13:21:22 +00:00
parent 07e0bf9413
commit 3828b3754a
1 changed files with 124 additions and 14 deletions
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114
src/main/java/org/jboss/netty/channel/socket/nio/NioWorker.java
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@ -46,7 +46,25 @@ import org.jboss.netty.util.ThreadRenamingRunnable;
class NioWorker implements Runnable {
private static final InternalLogger logger = InternalLoggerFactory.getInstance(NioWorker.class);
private static final InternalLogger logger =
InternalLoggerFactory.getInstance(NioWorker.class);
/**
* FIXME Auto-detect the level
*
* 0 - no need to wake up to get / set interestOps
* 1 - no need to wake up to get interestOps, but need to wake up to set.
* 2 - need to wake up to get / set interestOps
*/
private static final int WAKEUP_REQUIREMENT_LEVEL = 0;
static {
if (WAKEUP_REQUIREMENT_LEVEL < 0 || WAKEUP_REQUIREMENT_LEVEL > 2) {
throw new Error(
"Unexpected wakeup requirement level: " +
WAKEUP_REQUIREMENT_LEVEL + ", please report this error.");
}
}
private final int bossId;
private final int id;
@ -284,11 +302,12 @@ class NioWorker implements Runnable {
} else {
maxWrittenBytes = Integer.MAX_VALUE;
}
int writtenBytes = 0;
synchronized (channel.writeBuffer) {
for (;;) {
if (channel.writeBuffer.isEmpty() && channel.currentWriteEvent == null) {
if (channel.currentWriteEvent == null && channel.writeBuffer.isEmpty()) {
removeOpWrite = true;
break;
}
@ -350,6 +369,9 @@ class NioWorker implements Runnable {
Selector selector = worker.selector;
SelectionKey key = channel.socket.keyFor(selector);
if (key == null) {
return;
}
if (!key.isValid()) {
close(key);
return;
@ -357,6 +379,33 @@ class NioWorker implements Runnable {
int interestOps;
boolean changed = false;
if (opWrite) {
switch (WAKEUP_REQUIREMENT_LEVEL) {
case 0:
interestOps = key.interestOps();
if ((interestOps & SelectionKey.OP_WRITE) == 0) {
interestOps |= SelectionKey.OP_WRITE;
key.interestOps(interestOps);
changed = true;
}
break;
case 1:
interestOps = key.interestOps();
if ((interestOps & SelectionKey.OP_WRITE) == 0) {
if (Thread.currentThread() == worker.thread) {
interestOps |= SelectionKey.OP_WRITE;
key.interestOps(interestOps);
changed = true;
} else {
synchronized (worker.selectorGuard) {
selector.wakeup();
interestOps |= SelectionKey.OP_WRITE;
key.interestOps(interestOps);
changed = true;
}
}
}
break;
case 2:
if (Thread.currentThread() == worker.thread) {
interestOps = key.interestOps();
if ((interestOps & SelectionKey.OP_WRITE) == 0) {
@ -375,7 +424,38 @@ class NioWorker implements Runnable {
}
}
}
break;
default:
throw new Error();
}
} else {
switch (WAKEUP_REQUIREMENT_LEVEL) {
case 0:
interestOps = key.interestOps();
if ((interestOps & SelectionKey.OP_WRITE) != 0) {
interestOps &= ~SelectionKey.OP_WRITE;
key.interestOps(interestOps);
changed = true;
}
break;
case 1:
interestOps = key.interestOps();
if ((interestOps & SelectionKey.OP_WRITE) != 0) {
if (Thread.currentThread() == worker.thread) {
interestOps &= ~SelectionKey.OP_WRITE;
key.interestOps(interestOps);
changed = true;
} else {
synchronized (worker.selectorGuard) {
selector.wakeup();
interestOps &= ~SelectionKey.OP_WRITE;
key.interestOps(interestOps);
changed = true;
}
}
}
break;
case 2:
if (Thread.currentThread() == worker.thread) {
interestOps = key.interestOps();
if ((interestOps & SelectionKey.OP_WRITE) != 0) {
@ -394,6 +474,10 @@ class NioWorker implements Runnable {
}
}
}
break;
default:
throw new Error();
}
}
if (changed) {
@ -458,6 +542,28 @@ class NioWorker implements Runnable {
boolean changed = false;
try {
switch (WAKEUP_REQUIREMENT_LEVEL) {
case 0:
if (key.interestOps() != interestOps) {
key.interestOps(interestOps);
changed = true;
}
break;
case 1:
if (key.interestOps() != interestOps) {
if (Thread.currentThread() == worker.thread) {
key.interestOps(interestOps);
changed = true;
} else {
synchronized (worker.selectorGuard) {
selector.wakeup();
key.interestOps(interestOps);
changed = true;
}
}
}
break;
case 2:
if (Thread.currentThread() == worker.thread) {
if (key.interestOps() != interestOps) {
key.interestOps(interestOps);
@ -472,6 +578,10 @@ class NioWorker implements Runnable {
}
}
}
break;
default:
throw new Error();
}
future.setSuccess();
if (changed) {