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Posted to commits@harmony.apache.org by "Aleksey Shipilev (JIRA)" <ji...@apache.org> on 2008/03/23 22:33:24 UTC
[jira] Created: (HARMONY-5639) [drlvm][classloader][performance]
Make native class/method/field lookups unsynchronized
[drlvm][classloader][performance] Make native class/method/field lookups unsynchronized
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Key: HARMONY-5639
URL: https://issues.apache.org/jira/browse/HARMONY-5639
Project: Harmony
Issue Type: Improvement
Reporter: Aleksey Shipilev
Attachments: 0007-serial-vmClassloader.patch
Current implementation of classloader obtains the lock on any resolve operation, basically performing synchronized lookup in constant pool. The suggestion is to perform such lookups at fastpath desychronized, on failure obtain the lock and lookup again.
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[jira] Updated: (HARMONY-5639) [drlvm][classloader][performance]
Make native class/method/field lookups unsynchronized
Posted by "Nathan Beyer (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HARMONY-5639?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Nathan Beyer updated HARMONY-5639:
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Priority: Trivial (was: Major)
The current patch doesn't look safe, so I'm dropping the priority.
> [drlvm][classloader][performance] Make native class/method/field lookups unsynchronized
> ---------------------------------------------------------------------------------------
>
> Key: HARMONY-5639
> URL: https://issues.apache.org/jira/browse/HARMONY-5639
> Project: Harmony
> Issue Type: Sub-task
> Reporter: Aleksey Shipilev
> Priority: Trivial
> Attachments: 0007-serial-vmClassloader.patch
>
>
> Current implementation of classloader obtains the lock on any resolve operation, basically performing synchronized lookup in constant pool. The suggestion is to perform such lookups at fastpath desychronized, on failure obtain the lock and lookup again.
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[jira] Updated: (HARMONY-5639) [drlvm][classloader][performance]
Make native class/method/field lookups unsynchronized
Posted by "Aleksey Shipilev (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HARMONY-5639?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Aleksey Shipilev updated HARMONY-5639:
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Issue Type: Sub-task (was: Improvement)
Parent: HARMONY-5632
> [drlvm][classloader][performance] Make native class/method/field lookups unsynchronized
> ---------------------------------------------------------------------------------------
>
> Key: HARMONY-5639
> URL: https://issues.apache.org/jira/browse/HARMONY-5639
> Project: Harmony
> Issue Type: Sub-task
> Reporter: Aleksey Shipilev
> Attachments: 0007-serial-vmClassloader.patch
>
>
> Current implementation of classloader obtains the lock on any resolve operation, basically performing synchronized lookup in constant pool. The suggestion is to perform such lookups at fastpath desychronized, on failure obtain the lock and lookup again.
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[jira] Updated: (HARMONY-5639) [drlvm][classloader][performance]
Make native class/method/field lookups unsynchronized
Posted by "Aleksey Shipilev (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HARMONY-5639?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Aleksey Shipilev updated HARMONY-5639:
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Attachment: 0007-serial-vmClassloader.patch
0007-serial-vmClassloader.patch
Proof-of-concept patch.
Eliminates up to 70% of contended synchronization on SerialBench (8-core Clovertown).
> [drlvm][classloader][performance] Make native class/method/field lookups unsynchronized
> ---------------------------------------------------------------------------------------
>
> Key: HARMONY-5639
> URL: https://issues.apache.org/jira/browse/HARMONY-5639
> Project: Harmony
> Issue Type: Improvement
> Reporter: Aleksey Shipilev
> Attachments: 0007-serial-vmClassloader.patch
>
>
> Current implementation of classloader obtains the lock on any resolve operation, basically performing synchronized lookup in constant pool. The suggestion is to perform such lookups at fastpath desychronized, on failure obtain the lock and lookup again.
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You can reply to this email to add a comment to the issue online.