Peter Crowther wrote:
From: David kerber [dcker...@verizon.net]
My cpu usage for tomcat
has gone from bouncing between 0 and 1 in task manager, to a steady 2
since more threads are now actually doing work instead of waiting around
for their turn at the code, my disk writes per sec in perfmon have also
more than doubled, and the destination log file is growing much faster
as well.
All excellent news. The fact that you've seen the performance double means
that there was, in fact, a bottleneck there. Have you taken a new thread dump
to see whether the locks (almost certainly on the log write) are still a
problem? If so, you might have to go to a more complex scheme such as multiple
log files managed by a pool manager. Don't even try to write the pool manager
yourself; they're horribly messy things to get right and shake the race
conditions out*. I half-remember Jakarta Commons has one that can be adapted
if you get to that stage.
From what I can tell now, it looks like most of my wait time is on
socket reads. In the thread dump I took about 20 minutes ago, I didn't
see any waiting on disk writes:
The line listed in this one is my inputStream.read():
[2009-05-11 08:20:09] [info] "http-1024-Processor8"
[2009-05-11 08:20:09] [info] daemon
[2009-05-11 08:20:09] [info] prio=6 tid=0x270e83c8
[2009-05-11 08:20:09] [info] nid=0xcd4
[2009-05-11 08:20:09] [info] runnable
[2009-05-11 08:20:09] [info] [0x2755f000..0x2755f9e4]
[2009-05-11 08:20:09] [info] at
java.net.SocketInputStream.socketRead0(Native Method)
[2009-05-11 08:20:10] [info] at
java.net.SocketInputStream.read(Unknown Source)
[2009-05-11 08:20:10] [info] at
org.apache.coyote.http11.InternalInputBuffer.fill(InternalInputBuffer.java:747)
[2009-05-11 08:20:10] [info] at
org.apache.coyote.http11.InternalInputBuffer$InputStreamInputBuffer.doRead(InternalInputBuffer.java:777)
[2009-05-11 08:20:10] [info] at
org.apache.coyote.http11.filters.IdentityInputFilter.doRead(IdentityInputFilter.java:115)
[2009-05-11 08:20:10] [info] at
org.apache.coyote.http11.InternalInputBuffer.doRead(InternalInputBuffer.java:712)
[2009-05-11 08:20:10] [info] at
org.apache.coyote.Request.doRead(Request.java:423)
[2009-05-11 08:20:10] [info] at
org.apache.catalina.connector.InputBuffer.realReadBytes(InputBuffer.java:283)
[2009-05-11 08:20:10] [info] at
org.apache.tomcat.util.buf.ByteChunk.substract(ByteChunk.java:404)
[2009-05-11 08:20:10] [info] at
org.apache.catalina.connector.InputBuffer.read(InputBuffer.java:298)
[2009-05-11 08:20:10] [info] at
org.apache.catalina.connector.CoyoteInputStream.read(CoyoteInputStream.java:192)
[2009-05-11 08:20:10] [info] at
eddsrv.EddRcvr.processRequest(EddRcvr.java:199)
[2009-05-11 08:20:10] [info] at eddsrv.EddRcvr.doPost(EddRcvr.java:94)
[2009-05-11 08:20:10] [info] at
javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
[2009-05-11 08:20:10] [info] at
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
[2009-05-11 08:20:10] [info] at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
[2009-05-11 08:20:10] [info] at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
[2009-05-11 08:20:10] [info] at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
[2009-05-11 08:20:10] [info] at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
[2009-05-11 08:20:10] [info] at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
[2009-05-11 08:20:10] [info] at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
[2009-05-11 08:20:10] [info] at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
[2009-05-11 08:20:11] [info] at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
[2009-05-11 08:20:11] [info] at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
[2009-05-11 08:20:11] [info] at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)
[2009-05-11 08:20:11] [info] at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
[2009-05-11 08:20:11] [info] at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
[2009-05-11 08:20:11] [info] at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
[2009-05-11 08:20:11] [info] at java.lang.Thread.run(Unknown Source)
[2009-05-11 08:20:11] [info]
This one seems to be waiting on something in tomcat itself:
[2009-05-11 08:19:49] [info] "http-1024-Processor45"
[2009-05-11 08:19:49] [info] daemon
[2009-05-11 08:19:49] [info] prio=6 tid=0x26fa6f38
[2009-05-11 08:19:49] [info] nid=0x340
[2009-05-11 08:19:49] [info] runnable
[2009-05-11 08:19:49] [info] [0x27edf000..0x27edfae4]
[2009-05-11 08:19:49] [info] at
java.net.SocketInputStream.socketRead0(Native Method)
[2009-05-11 08:19:49] [info] at
java.net.SocketInputStream.read(Unknown Source)
[2009-05-11 08:19:49] [info] at
org.apache.coyote.http11.InternalInputBuffer.fill(InternalInputBuffer.java:737)
[2009-05-11 08:19:49] [info] at
org.apache.coyote.http11.InternalInputBuffer.parseRequestLine(InternalInputBuffer.java:398)
[2009-05-11 08:19:50] [info] at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:827)
[2009-05-11 08:19:50] [info] at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:667)
[2009-05-11 08:19:50] [info] at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
[2009-05-11 08:19:50] [info] at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
[2009-05-11 08:19:50] [info] at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
[2009-05-11 08:19:50] [info] at java.lang.Thread.run(Unknown Source)
[2009-05-11 08:19:50] [info]
I'm also open to suggestions on tuning my socket performance, if there's
anything that can be done with it, though I'm aware it's likely the OS,
and not tomcat that is the issue.
Dave
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