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
