harmony-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Aleksey Shipilev (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-5636) [classlib][luni][performance] java.lang.reflect.Proxy cache should be unsynchronized
Date Thu, 27 Mar 2008 15:11:24 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-5636?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12582680#action_12582680
] 

Aleksey Shipilev commented on HARMONY-5636:
-------------------------------------------

Sure, the patch is not safe, it's just POC. According to my measurements, up to 15% of _contended_
synchronization on SerialBench running on 8-core  server originates from this location. The
reason for this is OOS.writeClassDesc call during the serialization.

I changed WeakHashMap to HashMap to avoid internal WeakHashMap's synchronization. This change
is POC too.

> [classlib][luni][performance] java.lang.reflect.Proxy cache should be unsynchronized
> ------------------------------------------------------------------------------------
>
>                 Key: HARMONY-5636
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5636
>             Project: Harmony
>          Issue Type: Improvement
>            Reporter: Aleksey Shipilev
>            Priority: Minor
>         Attachments: 0004-serial-isProxyClass.patch
>
>
> For now, the proxyCache in Proxy is synchronized, which lead to performance problems
with accessing Proxy.isProxyClass() from multiple threads at once.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message