Hi Manna, I didn't copied full stack, it seems most threads are actually in TaskQueue.poll, see the full thread trace:
Thread 1714: (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) Thread 1707: (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) etc. (many more like these) On Sun, Nov 24, 2019 at 12:13 PM M. Manna <manme...@gmail.com> wrote: > 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 <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 > > > > >
