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From "Aleksey Shipilev (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HARMONY-5633) [drlvm][performance] ObjectStreamClass lookup improvement
Date Sun, 23 Mar 2008 19:55:24 GMT

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

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

    Attachment: 0001-serial-lookupClass.patch

0001-serial-lookupClass.patch
Basic POC patch for this issue:
 - stores the OSC in Class field
 - creates one OSC per Class on demand

Pitfalls:
 1. Breaks specification (public fields/methods in Class) - need to implement backing storage
in o.a.h.*
 2. No weak references here. Need to wrap the OSC instance with WeakReference.

> [drlvm][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
>
>
> 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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