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From "Aleksey Shipilev (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HARMONY-5633) [classlib][luni][performance] ObjectStreamClass lookup improvement
Date Tue, 08 Apr 2008 13:51:26 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-5633?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aleksey Shipilev updated HARMONY-5633:
--------------------------------------

    Attachment: serial-lookupClass-RC2.patch

serial-lookupClass-RC2.patch
 - Moves caches to ThreadLocalCache.
 - Leaves WeakHashMap as storage.

I think this patch solves the problem Alexei described. Alexei?

This patch still gives +80% boost for MT/SerialBench at 8-core Clovertown.

> [classlib][luni][performance] ObjectStreamClass lookup improvement
> ------------------------------------------------------------------
>
>                 Key: HARMONY-5633
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5633
>             Project: Harmony
>          Issue Type: Improvement
>            Reporter: Aleksey Shipilev
>         Attachments: 0001-serial-lookupClass.patch, serial-lookupClass-RC1.patch, serial-lookupClass-RC2.patch
>
>
> For now, ObjectStreamClass (OSC) is created on-the-fly during serialization/deserialization
and stored in static cache.
> Performance problems arose when several threads doing the lookups, hitting on synchronized
cache. Moreover, the cache is built around WeakHashMap to ensure GC of OSCs. This issue is
the source of scalability problems for multi-threaded serialization benchmarks.

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