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From "M. Manna" <manme...@gmail.com>
Subject Re: CPU high usage, the reason org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run
Date Sun, 24 Nov 2019 11:13:33 GMT
I’m suspecting it’s the same issue that we found out for 8.5.45 where the
commit didn’t get reverted out in Poll.java

Or maybe not.

Thanks,

On Sun, 24 Nov 2019 at 10:36, Mark Thomas <markt@apache.org> wrote:

> Tomcat version?
>
> Operating system?
>
> Java version?
>
> Mark
>
>
> On 24/11/2019 09:57, Mladen Adamović wrote:
> > I couldn't find the explanation of this in other threads, I've tried to
> > search the archive.
> >
> > I have a high load average on a server and the reason for that is kernel
> > function futex_wait invoked by java thread.
> >
> > By doing jstack, I see a lot of BLOCKED threads like these:
> > Thread 1725: (state = BLOCKED)
> >  - sun.misc.Unsafe.park(boolean, long) @bci=0 (Compiled frame;
> information
> > may be imprecise)
> >  - java.util.concurrent.locks.LockSupport.parkNanos(java.lang.Object,
> long)
> > @bci=20, line=215 (Compiled frame)
> >  -
> >
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(long)
> > @bci=78, line=2078 (Compiled frame)
> >  - java.util.concurrent.LinkedBlockingQueue.poll(long,
> > java.util.concurrent.TimeUnit) @bci=62, line=467 (Compiled frame)
> >  - org.apache.tomcat.util.threads.TaskQueue.poll(long,
> > java.util.concurrent.TimeUnit) @bci=3, line=85 (Compiled frame)
> >  - org.apache.tomcat.util.threads.TaskQueue.poll(long,
> > java.util.concurrent.TimeUnit) @bci=3, line=31 (Compiled frame)
> >  - java.util.concurrent.ThreadPoolExecutor.getTask() @bci=134, line=1066
> > (Compiled frame)
> >  -
> >
> java.util.concurrent.ThreadPoolExecutor.runWorker(java.util.concurrent.ThreadPoolExecutor$Worker)
> > @bci=26, line=1127 (Compiled frame)
> >  - java.util.concurrent.ThreadPoolExecutor$Worker.run() @bci=5, line=617
> > (Compiled frame)
> >  - org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run()
> @bci=4,
> > line=61 (Compiled frame)
> >  - java.lang.Thread.run() @bci=11, line=745 (Compiled frame)
> >
> >
> >
> > What does this
> > org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run() actually
> > does when BLOCKED?
> >
> > Should I perhaps lower some tomcat config values or just forget about
> > measuring system resources if the server works? My tomcat is configured
> as
> > follows:
> >
> >
> > my Tomcat is configured as follows:
> >   <Connector port="8181"
> > protocol="org.apache.coyote.http11.Http11AprProtocol"
> >               SSLCertificateFile="/etc/letsencrypt/live/
> numbeo.com/cert.pem"
> >               SSLCertificateKeyFile="/etc/letsencrypt/live/
> > numbeo.com/privkey.pem"
> >               SSLCertificateChainFile="/etc/letsencrypt/live/
> > numbeo.com/chain.pem"
> >               SSLVerifyClient="optional"
> SSLProtocol="TLSv1+TLSv1.1+TLSv1.2"
> >               connectionTimeout="20000" acceptCount="30000"
> >               acceptorThreadCount="2"
> >               compression="on" maxConnections="50000" maxThreads="500"
> >
> >
> compressableMimeType="text/html,text/xml,text/plain,text/css,text/javascript,application/javascript,image/svg+xml,image/svg,image/png,image/jpeg"
> >
> >               useSendfile="false"
> >               maxHttpHeaderSize="16392" SSLEnabled="true"
> >               enableLookups="false"
> >               scheme="https" secure="true"   clientAuth="false"
> >  useBodyEncodingForURI="true"
> >               URIEncoding="UTF-8"
> >               />
> >
>
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