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From Mladen Adamović <mladen.adamo...@gmail.com>
Subject Re: CPU high usage, the reason org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run
Date Sun, 24 Nov 2019 12:29:20 GMT
Tomcat 8.5.5
Java 1.8.0_101
OS: Ubuntu 4.4.0-38-generic


On Sun, Nov 24, 2019 at 11:36 AM 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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