-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Rich,
On 6/30/15 2:06 PM, Rich Mayfield wrote: > Moved from Tomcat 7.0.55 to Tomcat 8.0.23 and now see the AJP > Poller thread churning through a lot of CPU in a pretty much quiet > system. > > This seems like a bug. > > * Restarting does not resolve the issue * I've seen some mention of > bumping up the memory. Doubling the max heap (-Xmx from 506m to > 1012m) does not help. This is a relatively small service that is > essentially idle - or at least it would be with the exception of > this Poller thread. > > The connector configuration is unchanged. > > <Connector port="28080" protocol="AJP/1.3" secure="true" > scheme="https" connectionTimeout="20000" packetSize="20000" > maxThreads="1024" URIEncoding="UTF-8" redirectPort="443" > useSendfile="false" compression="force" > compressableMimeTypes="text/html,text/xml,text/plain,text/javascript,t ext/css,application/json,application/xml" > > /> > > The thread consuming all the CPU > > "ajp-apr-28080-Poller" #62 daemon prio=5 os_prio=0 > tid=0x00002ba40293e000 nid=0x407d waiting on condition > [0x00002ba3fc200000] java.lang.Thread.State: WAITING (parking) at > sun.misc.Unsafe.park(Native Method) - parking to wait for > <0x00000000eaf94570> (a > java.util.concurrent.locks.ReentrantLock$NonfairSync) at > java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) > at > java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInte rrupt(AbstractQueuedSynchronizer.java:836) > > at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(Abst ractQueuedSynchronizer.java:870) > at > java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(Abstract QueuedSynchronizer.java:1199) > > at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock. java:209) > at > java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:285) > > at java.util.concurrent.LinkedBlockingQueue.signalNotEmpty(LinkedBlockingQu eue.java:172) > at > java.util.concurrent.LinkedBlockingQueue.offer(LinkedBlockingQueue.jav a:430) > > at org.apache.tomcat.util.threads.TaskQueue.offer(TaskQueue.java:74) > at > org.apache.tomcat.util.threads.TaskQueue.offer(TaskQueue.java:31) > at > java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.jav a:1361) > > at org.apache.tomcat.util.threads.ThreadPoolExecutor.execute(ThreadPoolExec utor.java:161) > at > org.apache.tomcat.util.threads.ThreadPoolExecutor.execute(ThreadPoolEx ecutor.java:141) > > at org.apache.tomcat.util.net.AprEndpoint.processSocket(AprEndpoint.java:89 6) > at > org.apache.tomcat.util.net.AprEndpoint$Poller.run(AprEndpoint.java:188 3) > > at java.lang.Thread.run(Thread.java:745) > > > # rpm -qa | grep apr apr-1.5.1-1 apr-util-1.5.3-1 > > # rpm -qa | grep http httpd-2.2.27-1 > > Server version: Apache Tomcat/8.0.23 Server built: May 19 2015 > 14:58:38 UTC Server number: 8.0.23.0 OS Name: Linux OS > Version: 2.6.18-371.el5 Architecture: amd64 JVM Version: > 1.8.0_40-b25 JVM Vendor: Oracle Corporation Do you have more than one "Poller" thread for the APR connector? That thread is currently blocked on a monitor. Are you saying that it looks like it wakes up all the time and then goes back to sleep? The poller thread is responsible for routing I/O requests between the sockets and the request processors. Basically, it figures out which thread's data is available and then hands it off. So, the poller thread is often busy, but it doesn't do a great deal of actual work itself. - -chris -----BEGIN PGP SIGNATURE----- Comment: GPGTools - http://gpgtools.org iQIcBAEBCAAGBQJVnYIKAAoJEBzwKT+lPKRYg0kP/1dlwElcKwLCVwHzZ6S8gG/n hIX3Xj0Z0K4+odIVSpjHYGfCObNOtZFmUohXxCqRhrtvOf6VIkmy3FYmR+Uth4Et iMdAI+w1g4XhkkdPo8vThJngHrK4wzXlJSWmoMX9Tq7fGKBu0nWkT6c9PgNFWK3E glTUIOoQqKt6qJnMZU8Z3wCLjQFcPoLB7/VfAugK/BfA6YpZ6UuUx3hNT0qQ2LoV T0QX0qESJjvmhkUgKUUS4VyRd7J8NfXsbk5w/NFX1AgCfOpEOduhsd0K2SxZI5/Z sydBduMXdubSN59ckcRFFeOjxCwQ1r07nYl3KH2H2SwiK02V8dCXyObW/ZIDPbyN HAnfE9K9wTzZUeJpyDYew8BRcPKgZS6WXYgcovHAZZtMCyTJTDMjmMQai0rlh+M5 ++MhLqUmsvUL4JhdhMzfb/CFbKBDBRPM0oVSWIfAh/eALIj7Og1iM0wl7oPrOHHL n+ww9+fix7Ik1hRD1DBjlk2eB6NQUQ2p6UZIa9fGgYp9rTHpkDaayFOzEc0iheoS twwlP3a+GJ2TfCsjR1KPfsNIuCpXRiYVDpxm1PJY5/9UssiqiNRS/8yVVZX9E7fU TAlgNMBZu81eswGWB6bhlmifFtOhMTmqwm/AViqUkMB4IcVoLDtWwKyXU3eSzdmu MmsSGJ2O1r2aQhO1Er9Y =s0s6 -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
