Hi Christopher.
On Tue, Mar 10, 2009 at 11:04:43AM -0400, Christopher Schultz wrote:
> > I
> > would like to know if they are useful and if not how to lessen their
> > number.
>
> You should do a thread dump (send a SIG 3
> to your process and watch stdout)
Thank you, that has made much clearer.
> JVM-created threads (you can't eliminate these):
>
> "main" - runs the main program
> "Reference Handler" - GC thread
> "Finalizer" - GC thread
> "Low Memory Detector" - GC thread
> "CompilerThread0" - JIT thread
> "Signal Dispatcher" - Handles signals
>
> Tomcat-created threads:
> "ContainerBackgroundProcessor[StandardEngine[Catalina]]"
> "TP-Monitor" - monitors the request handler thread pool
> "TP-Processor[n]" - these are the request handlers.
> You have configured your TC instance to have between
> 2 and 10 of them. I wouldn't be surprised to find
> that you have 5 TP-Processor threads. I have 12.
> My thread dump contained 5 JVM threads + 14 Tomcat threads + 1 MySQL
> thread = 20 threads. You have 27, and you didn't tell us a thing about
> what your application does.
"Default Tomcat home page" and Server-status/Tomcat Manager
applications :)
> > <Connector address="123.123.123.123" port="50002" protocol="HTTP/1.1"
> > connectionTimeout="20000" maxThreads="10" minSpareThreads="2"
> > maxSpareThreads="5" />
>
> This is the only information you gave us that could help determine what
> those threads are. If you take a thread dump and re-post, we might be
> able to help.
Full thread dump Java HotSpot(TM) 64-Bit Server VM (10.0-b22 mixed mode):
"http-123.123.123.123-50002-Acceptor-0" daemon prio=10 tid=0x00002aaac4a5e000
nid=0x348b runnable [0x000000004143c000..0x000000
004143cd90]
java.lang.Thread.State: RUNNABLE
...
[full dump in attach]
$ grep -c tid catalina.out
19
According to the written above everything is clear in the dump.
Thank you so much for your help.
But i've got one question left, can I set idle timeout for
the thread TP-Processor, after which they will die?
--
BRGDS. Alexey Vlasov.
Full thread dump Java HotSpot(TM) 64-Bit Server VM (10.0-b22 mixed mode):
"http-123.123.123.123-50002-Acceptor-0" daemon prio=10 tid=0x00002aaac4a5e000
nid=0x348b runnable [0x000000004143c000..0x000000
004143cd90]
java.lang.Thread.State: RUNNABLE
at java.net.PlainSocketImpl.socketAccept(Native Method)
at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:384)
- locked <0x00002aaac0a902e8> (a java.net.SocksSocketImpl)
at java.net.ServerSocket.implAccept(ServerSocket.java:453)
at java.net.ServerSocket.accept(ServerSocket.java:421)
at
org.apache.tomcat.util.net.DefaultServerSocketFactory.acceptSocket(Unknown
Source)
at org.apache.tomcat.util.net.JIoEndpoint$Acceptor.run(Unknown Source)
at java.lang.Thread.run(Thread.java:619)
"ContainerBackgroundProcessor[StandardEngine[Catalina]]" daemon prio=10
tid=0x00002aaac4a5d800 nid=0x348a waiting on condition
[0x000000004133b000..0x000000004133bd10]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at
org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(Unknown
Source)
at java.lang.Thread.run(Thread.java:619)
"Low Memory Detector" daemon prio=10 tid=0x00002aaac8023400 nid=0x3455 runnable
[0x0000000000000000..0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"CompilerThread1" daemon prio=10 tid=0x00002aaac8020800 nid=0x3454 waiting on
condition [0x0000000000000000..0x00000000410373e0]
java.lang.Thread.State: RUNNABLE
"CompilerThread0" daemon prio=10 tid=0x00002aaac801f000 nid=0x3453 waiting on
condition [0x0000000000000000..0x0000000040f36360]
java.lang.Thread.State: RUNNABLE
"Signal Dispatcher" daemon prio=10 tid=0x00002aaac801dc00 nid=0x3452 waiting on
condition [0x0000000000000000..0x0000000000000000]
java.lang.Thread.State: RUNNABLE
"Finalizer" daemon prio=10 tid=0x00002aaac42bac00 nid=0x344d in Object.wait()
[0x0000000040d35000..0x0000000040d35c10]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00002aaac08e0be0> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:116)
- locked <0x00002aaac08e0be0> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:132)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:159)
"Reference Handler" daemon prio=10 tid=0x00002aaac42b9800 nid=0x344c in
Object.wait() [0x0000000040c34000..0x0000000040c34d90]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x00002aaac08e01b0> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:485)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)
- locked <0x00002aaac08e01b0> (a java.lang.ref.Reference$Lock)
"main" prio=10 tid=0x0000000040113400 nid=0x3442 runnable
[0x0000000040229000..0x000000004022aed0]
java.lang.Thread.State: RUNNABLE
at java.net.PlainSocketImpl.socketAccept(Native Method)
at java.net.PlainSocketImpl.accept(PlainSocketImpl.java:384)
- locked <0x00002aaabe937cf8> (a java.net.SocksSocketImpl)
at java.net.ServerSocket.implAccept(ServerSocket.java:453)
at java.net.ServerSocket.accept(ServerSocket.java:421)
at org.apache.catalina.core.StandardServer.await(Unknown Source)
at org.apache.catalina.startup.Catalina.await(Unknown Source)
at org.apache.catalina.startup.Catalina.start(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Unknown Source)
at org.apache.catalina.startup.Bootstrap.main(Unknown Source)
"VM Thread" prio=10 tid=0x00002aaac42b4400 nid=0x344b runnable
"GC task thread#0 (ParallelGC)" prio=10 tid=0x000000004011d800 nid=0x3443
runnable
"GC task thread#1 (ParallelGC)" prio=10 tid=0x000000004011ec00 nid=0x3444
runnable
"GC task thread#2 (ParallelGC)" prio=10 tid=0x000000004011fc00 nid=0x3445
runnable
"GC task thread#3 (ParallelGC)" prio=10 tid=0x0000000040121000 nid=0x3446
runnable
"GC task thread#4 (ParallelGC)" prio=10 tid=0x0000000040122400 nid=0x3447
runnable
"GC task thread#5 (ParallelGC)" prio=10 tid=0x0000000040123800 nid=0x3448
runnable
"GC task thread#6 (ParallelGC)" prio=10 tid=0x0000000040124c00 nid=0x3449
runnable
"GC task thread#7 (ParallelGC)" prio=10 tid=0x0000000040126000 nid=0x344a
runnable
"VM Periodic Task Thread" prio=10 tid=0x00002aaac8025800 nid=0x3456 waiting on
condition
JNI global references: 1115
Heap
PSYoungGen total 38208K, used 5503K [0x00002aaabe8e0000,
0x00002aaac1380000, 0x00002aaac3e30000)
eden space 32768K, 6% used
[0x00002aaabe8e0000,0x00002aaabeacba10,0x00002aaac08e0000)
from space 5440K, 65% used
[0x00002aaac08e0000,0x00002aaac0c54348,0x00002aaac0e30000)
to space 5440K, 0% used
[0x00002aaac0e30000,0x00002aaac0e30000,0x00002aaac1380000)
PSOldGen total 87424K, used 0K [0x00002aaab3e30000, 0x00002aaab9390000,
0x00002aaabe8e0000)
object space 87424K, 0% used
[0x00002aaab3e30000,0x00002aaab3e30000,0x00002aaab9390000)
PSPermGen total 21248K, used 10714K [0x00002aaaaea30000,
0x00002aaaafef0000, 0x00002aaab3e30000)
object space 21248K, 50% used
[0x00002aaaaea30000,0x00002aaaaf4a6948,0x00002aaaafef0000)
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