0001428: Locking in Jar.create() method blocks application performance

Viewing Issue Advanced Details [ Jump to Notes ]

[ View Simple ] [ Issue History ] [ Print ]

Category

Severity

Reproducibility

Date Submitted

Last Update

0001428

[Resin]

major

always

10-30-06 06:49

11-01-06 11:14

Reporter

mabbott

View Status

public

Assigned To

ferg

Priority

normal

Resolution

fixed

Platform

Status

closed

Projection

none

OS Version

ETA

none

Fixed in Version

3.1.0

Product Version

3.0.19

Product Build

Summary

0001428: Locking in Jar.create() method blocks application performance

Description

Our application makes heavy use of JavaMail and most requests must
at some point get a JavaMail Session instance. We have found very
heavy lock contention (2/3 of all threads) caused by the Resin
class loader resource fetch locking in the Jar.create method.
A stack dump is below. This is the limiting factor in the
application performance.

"resin-tcp-connection-*:80-3939" daemon prio=10 tid=0x00bd3fb8 nid=0x24f13 waiting for monitor entry [0xc60fe000..0xc60ffc70]
    at com.caucho.vfs.Jar.create(Jar.java:124)
    - waiting to lock <0xd78e6ca8> (a com.caucho.util.LruCache)
    at com.caucho.vfs.JarPath.getJar(JarPath.java:196)
    at com.caucho.vfs.JarPath.canRead(JarPath.java:157)
    at com.caucho.loader.TreeLoader.getPath(TreeLoader.java:312)
    at com.caucho.loader.Loader.getResourceAsStream(Loader.java:164)
    at com.caucho.loader.DynamicClassLoader.getResourceAsStream(DynamicClassLoader.java:1397)
    at com.caucho.loader.DynamicClassLoader.getParentResourceAsStream(DynamicClassLoader.java:1419)
    at com.caucho.loader.DynamicClassLoader.getResourceAsStream(DynamicClassLoader.java:1386)
    at com.caucho.loader.DynamicClassLoader.getParentResourceAsStream(DynamicClassLoader.java:1419)
    at com.caucho.loader.DynamicClassLoader.getResourceAsStream(DynamicClassLoader.java:1386)
    at java.lang.Class.getResourceAsStream(Class.java:1998)
    at javax.mail.SecuritySupport12$2.run(SecuritySupport12.java:41)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.mail.SecuritySupport12.getResourceAsStream(SecuritySupport12.java:39)
    at javax.mail.Session.loadResource(Session.java:1033)
    at javax.mail.Session.loadProviders(Session.java:871)
    at javax.mail.Session.<init>(Session.java:191)
    at javax.mail.Session.getInstance(Session.java:230)

Steps To Reproduce

Additional Information

Attached Files

Relationships

Notes
(0001570) ferg 11-01-06 11:14	Shifted synchronization to use putIfNew to remove lock dependency on the removeEvent

Issue History
Date Modified	Username	Field	Change
10-30-06 06:49	mabbott	New Issue
11-01-06 11:14	ferg	Note Added: 0001570
11-01-06 11:14	ferg	Assigned To	=> ferg
11-01-06 11:14	ferg	Status	new => closed
11-01-06 11:14	ferg	Resolution	open => fixed
11-01-06 11:14	ferg	Fixed in Version	=> 3.1.0

Mantis 1.0.0rc3[^]

29 total queries executed.
26 unique queries executed.