epollWait blocks ,but why consume cpu
fuyou
fuyou001 at gmail.com
Fri May 9 03:14:20 UTC 2014
My program is build on Netty4 .
In benchmark,i find the epollWait consume many cpu,the jstack is
The stack of busy(10.4%) thread(30873/0x7899) of java process(30757)
of user(fuyou):
"NETTYSERVER-WORKER-19-thread-9" prio=10 tid=0x00002aaac418a000
nid=0x7899 runnable [0x0000000045f9a000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked <0x000000076c4cf1e0> (a
io.netty.channel.nio.SelectedSelectionKeySet)
--
The stack of busy(10.4%) thread(30866/0x7892) of java process(30757)
of user(fuyou):
"NETTYSERVER-WORKER-19-thread-2" prio=10 tid=0x00002aaac4252800
nid=0x7892 runnable [0x0000000045893000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked <0x000000076c4d1990> (a
io.netty.channel.nio.SelectedSelectionKeySet)
--
The stack of busy(10.4%) thread(30865/0x7891) of java process(30757)
of user(fuyou):
"NETTYSERVER-WORKER-19-thread-1" prio=10 tid=0x00002aaab95c0800
nid=0x7891 runnable [0x0000000045792000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked <0x000000076c47c0f0> (a
io.netty.channel.nio.SelectedSelectionKeySet)
--
The stack of busy(10.3%) thread(30871/0x7897) of java process(30757)
of user(fuyou):
"NETTYSERVER-WORKER-19-thread-7" prio=10 tid=0x00002aaac417f800
nid=0x7897 runnable [0x0000000045d98000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked <0x000000076c676820> (a
io.netty.channel.nio.SelectedSelectionKeySet)
--
The stack of busy(10.3%) thread(30869/0x7895) of java process(30757)
of user(fuyou):
"NETTYSERVER-WORKER-19-thread-5" prio=10 tid=0x00002aaac4061800
nid=0x7895 runnable [0x0000000045b96000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked <0x000000076c528d90> (a
io.netty.channel.nio.SelectedSelectionKeySet)
--
The stack of busy(10.3%) thread(30867/0x7893) of java process(30757)
of user(fuyou):
"NETTYSERVER-WORKER-19-thread-3" prio=10 tid=0x00002aaac4254800
nid=0x7893 runnable [0x0000000045994000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.NativeThread.current(Native Method)
at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:333)
- locked <0x000000076c4c90c8> (a java.lang.Object)
- locked <0x000000076c4c90b0> (a java.lang.Object)
at io.netty.buffer.PooledUnsafeDirectByteBuf.getBytes(PooledUnsafeDirectByteBuf.java:208)
--
The stack of busy(10.2%) thread(30874/0x789a) of java process(30757)
of user(fuyou):
"NETTYSERVER-WORKER-19-thread-10" prio=10 tid=0x00002aaac418c800
nid=0x789a runnable [0x000000004609b000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked <0x000000076c5a70b0> (a
io.netty.channel.nio.SelectedSelectionKeySet)
--
The stack of busy(10.2%) thread(30872/0x7898) of java process(30757)
of user(fuyou):
"NETTYSERVER-WORKER-19-thread-8" prio=10 tid=0x00002aaac4187800
nid=0x7898 runnable [0x0000000045e99000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked <0x000000076c62f290> (a
io.netty.channel.nio.SelectedSelectionKeySet)
--
The stack of busy(10.2%) thread(30870/0x7896) of java process(30757)
of user(fuyou):
"NETTYSERVER-WORKER-19-thread-6" prio=10 tid=0x00002aaac4190800
nid=0x7896 runnable [0x0000000045c97000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked <0x000000076c45e320> (a
io.netty.channel.nio.SelectedSelectionKeySet)
--
The stack of busy(10.2%) thread(30868/0x7894) of java process(30757)
of user(fuyou):
"NETTYSERVER-WORKER-19-thread-4" prio=10 tid=0x00002aaac405b000
nid=0x7894 runnable [0x0000000045a95000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked <0x000000076c6c2660> (a
io.netty.channel.nio.SelectedSelectionKeySet)
[yubao.fyb at vkvm169051 ~]$ cat busy_thread_20140509104529|grep
'NETTYSERVER-WORKER' -A6 -B2
The stack of busy(10.4%) thread(30873/0x7899) of java process(30757)
of user(fuyou):
"NETTYSERVER-WORKER-19-thread-9" prio=10 tid=0x00002aaac418a000
nid=0x7899 runnable [0x0000000045f9a000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked <0x000000076c4cf1e0> (a
io.netty.channel.nio.SelectedSelectionKeySet)
--
The stack of busy(10.4%) thread(30866/0x7892) of java process(30757)
of user(fuyou):
"NETTYSERVER-WORKER-19-thread-2" prio=10 tid=0x00002aaac4252800
nid=0x7892 runnable [0x0000000045893000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked <0x000000076c4d1990> (a
io.netty.channel.nio.SelectedSelectionKeySet)
--
The stack of busy(10.4%) thread(30865/0x7891) of java process(30757)
of user(fuyou):
"NETTYSERVER-WORKER-19-thread-1" prio=10 tid=0x00002aaab95c0800
nid=0x7891 runnable [0x0000000045792000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked <0x000000076c47c0f0> (a
io.netty.channel.nio.SelectedSelectionKeySet)
--
The stack of busy(10.3%) thread(30871/0x7897) of java process(30757)
of user(fuyou):
"NETTYSERVER-WORKER-19-thread-7" prio=10 tid=0x00002aaac417f800
nid=0x7897 runnable [0x0000000045d98000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked <0x000000076c676820> (a
io.netty.channel.nio.SelectedSelectionKeySet)
--
The stack of busy(10.3%) thread(30869/0x7895) of java process(30757)
of user(fuyou):
"NETTYSERVER-WORKER-19-thread-5" prio=10 tid=0x00002aaac4061800
nid=0x7895 runnable [0x0000000045b96000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked <0x000000076c528d90> (a
io.netty.channel.nio.SelectedSelectionKeySet)
--
The stack of busy(10.3%) thread(30867/0x7893) of java process(30757)
of user(fuyou):
"NETTYSERVER-WORKER-19-thread-3" prio=10 tid=0x00002aaac4254800
nid=0x7893 runnable [0x0000000045994000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.NativeThread.current(Native Method)
at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:333)
- locked <0x000000076c4c90c8> (a java.lang.Object)
- locked <0x000000076c4c90b0> (a java.lang.Object)
at io.netty.buffer.PooledUnsafeDirectByteBuf.getBytes(PooledUnsafeDirectByteBuf.java:208)
--
The stack of busy(10.2%) thread(30874/0x789a) of java process(30757)
of user(fuyou):
"NETTYSERVER-WORKER-19-thread-10" prio=10 tid=0x00002aaac418c800
nid=0x789a runnable [0x000000004609b000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked <0x000000076c5a70b0> (a
io.netty.channel.nio.SelectedSelectionKeySet)
--
The stack of busy(10.2%) thread(30872/0x7898) of java process(30757)
of user(fuyou):
"NETTYSERVER-WORKER-19-thread-8" prio=10 tid=0x00002aaac4187800
nid=0x7898 runnable [0x0000000045e99000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked <0x000000076c62f290> (a
io.netty.channel.nio.SelectedSelectionKeySet)
--
The stack of busy(10.2%) thread(30870/0x7896) of java process(30757)
of user(fuyou):
"NETTYSERVER-WORKER-19-thread-6" prio=10 tid=0x00002aaac4190800
nid=0x7896 runnable [0x0000000045c97000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked <0x000000076c45e320> (a
io.netty.channel.nio.SelectedSelectionKeySet)
--
The stack of busy(10.2%) thread(30868/0x7894) of java process(30757)
of user(fuyou):
"NETTYSERVER-WORKER-19-thread-4" prio=10 tid=0x00002aaac405b000
nid=0x7894 runnable [0x0000000045a95000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
- locked <0x000000076c6c2660> (a
io.netty.channel.nio.SelectedSelectionKeySet)
epollWait(...) blocks.why the consume cpu? has any idea to reduce cpu
I also asked the question in Netty
github<https://github.com/netty/netty/issues/2465>
=============================================
fuyou001
Best Regards
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