0003694: Major garbage collection (GC) causes thread spike

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Category

Severity

Reproducibility

Date Submitted

Last Update

0003694

[Resin]

major

always

09-23-09 11:46

01-18-11 20:33

Reporter

mocospace

View Status

public

Assigned To

ferg

Priority

normal

Resolution

fixed

Status

closed

Product Version

4.0.1

Summary

0003694: Major garbage collection (GC) causes thread spike

Description

Every major/full garbage collection (GC) in Resin 4.0.1 professional causes the number of threads to spike in the JVM. This was not the case in Resin 3.2.x professional and is preventing us from upgrading. Resin 4 also seems to use more threads in general than Resin 3. We are running on CentOS 5, with the following JVM params -

        <jvm-arg>-server</jvm-arg>
        <jvm-arg>-Xms2560m</jvm-arg>
        <jvm-arg>-Xmx4608m</jvm-arg>
        <jvm-arg>-XX:MaxPermSize=256m</jvm-arg>
        <jvm-arg>-XX:+UseConcMarkSweepGC</jvm-arg>
        <jvm-arg>-XX:+CMSClassUnloadingEnabled</jvm-arg>
        <jvm-arg>-XX:CMSInitiatingOccupancyFraction=60</jvm-arg>
        <jvm-arg>-XX:+PrintGCTimeStamps</jvm-arg>
        <jvm-arg>-XX:+DisableExplicitGC</jvm-arg>

Additional Information

Attached Files

threads.JPG [^] (27,446 bytes) 09-23-09 12:29

Relationships

Notes
(0004252) mocospace 09-23-09 12:19 edited on: 09-23-09 12:25	We are running java version "1.6.0_11" Java(TM) SE Runtime Environment (build 1.6.0_11-b03) Java HotSpot(TM) 64-Bit Server VM (build 11.0-b16, mixed mode) Attached screen shot of thread spike

(0004256) ferg 09-25-09 14:53	We've redone the threads significantly for 4.0.2. I don't know if this will greatly affect the issue you're seeing. The latest threading model does keep more threads around by default, where earlier versions of Resin were more aggressive about reaping idle threads.

(0004969) ferg 01-18-11 20:33	Threading model has changed in more recent versions of 4.0.x. If the problem persists, please submit a new bug report with the current version of Resin.

Issue History
Date Modified	Username	Field	Change
09-23-09 11:46	mocospace	New Issue
09-23-09 12:19	mocospace	Note Added: 0004252
09-23-09 12:25	mocospace	Note Edited: 0004252
09-23-09 12:29	mocospace	File Added: threads.JPG
09-25-09 14:53	ferg	Note Added: 0004256
01-18-11 20:33	ferg	Note Added: 0004969
01-18-11 20:33	ferg	Assigned To	=> ferg
01-18-11 20:33	ferg	Status	new => closed
01-18-11 20:33	ferg	Resolution	open => fixed
01-18-11 20:33	ferg	Fixed in Version	=> 4.0.14

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