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 <ma...@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" > > /> > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > >
