0000944: thread pile-up on log

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Category

Severity

Reproducibility

Date Submitted

Last Update

0000944

[Resin]

minor

always

02-16-06 10:50

03-27-06 11:41

Reporter

ferg

View Status

public

Assigned To

Priority

urgent

Resolution

fixed

Status

closed

Product Version

Summary

0000944: thread pile-up on log

Description

(rep by Bill Au)

This is resin pro 3.0.17 with SUN JDK 1.5.0_06 running on
32-bit RedHat Enterprise Linux 4.

We have a problem when all of a sudden the threads count in
the JVM goes through the roof. Enclosed are two JVM threads
dump taken 10 seconds apart. In each one there are close to
400 threads waiting on a lock in AccessLog.log().

The same thread is holding the lock in the both dumps was it
had been running for at least 10 seconds when the dumps were
taken. Is there any way to get around this? The high threads
count is causing OutOfMemoryError as we are running out of stack
space for all the threads:

java.lang.OutOfMemoryError: unable to create new native thread
        at java.lang.Thread.start0(Native Method)
        at java.lang.Thread.start(Thread.java:574)
        at
com.caucho.util.ThreadPool$ThreadLauncher.startConnection(ThreadPool.java:568)
        at
com.caucho.util.ThreadPool$ThreadLauncher.run(ThreadPool.java:607)
        at java.lang.Thread.run(Thread.java:595)

We are using the default stack size (-Xss1m). Not sure if we
can reduce it. Doing so may just delay the problem. We need to
fix the bottleneck for the threads pile-up.

Additional Information

Attached Files

Relationships

Notes
(0000945) ferg 03-27-06 11:41	That lock has been removed and the access log write synchronization has been modified to avoid the deadlock.

Issue History
Date Modified	Username	Field	Change
02-16-06 10:50	ferg	New Issue
03-27-06 11:41	ferg	Note Added: 0000945
03-27-06 11:41	ferg	Status	new => closed
03-27-06 11:41	ferg	Resolution	open => fixed
03-27-06 11:41	ferg	Fixed in Version	=> 3.0.19

Mantis 1.0.0rc3[^]

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