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

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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

Status

closed

Product Version

3.0.19

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)

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

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