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Date: Tue, 27 May 2008 05:27:40 -0700 (PDT)
From: "Sergey Dmitriev (JIRA)" <jira@apache.org>
To: commits@harmony.apache.org
Subject: [jira] Commented: (HARMONY-5829) [drlvm][kernel][performance]
 j.l.Class Serializable/Externalizable caching
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    [ https://issues.apache.org/jira/browse/HARMONY-5829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12600107#action_12600107 ] 

Sergey Dmitriev commented on HARMONY-5829:
------------------------------------------

Guys we have a degradation on SPECjvm2008.serial right after the 659908 commit.

Tigerton machine,
Harmony Windows IA32 build,
-Xem:server -Xms2000m -Xmx2000m,
-ikv.

HARMONY WINDOWS IA32 r659907:

  Benchmark:   serial
  Run mode:    timed run
  Test type:   multi
  Threads:     16
  Warmup:      120s
  Iterations:  1
  Run length:  240s

Warmup (120s) begins: Tue May 27 16:05:14 GMT+04:00 2008
Warmup (120s) ends:   Tue May 27 16:07:53 GMT+04:00 2008
Warmup (120s) result: 40.07 ops/m

Iteration 1 (240s) begins: Tue May 27 16:07:54 GMT+04:00 2008
Iteration 1 (240s) ends:   Tue May 27 16:12:26 GMT+04:00 2008
Iteration 1 (240s) result: 44.17 ops/m

Valid run!
Score on serial: 44.17 ops/m


HARMONY WINDOWS IA32 r659908:

  Benchmark:   serial
  Run mode:    timed run
  Test type:   multi
  Threads:     16
  Warmup:      120s
  Iterations:  1
  Run length:  240s

Warmup (120s) begins: Tue May 27 16:13:20 GMT+04:00 2008
Warmup (120s) ends:   Tue May 27 16:17:28 GMT+04:00 2008
Warmup (120s) result: 11.16 ops/m

Iteration 1 (240s) begins: Tue May 27 16:17:28 GMT+04:00 2008
Iteration 1 (240s) ends:   Tue May 27 16:22:57 GMT+04:00 2008
Iteration 1 (240s) result: 11.51 ops/m

Valid run!
Score on serial: 11.51 ops/m


> [drlvm][kernel][performance] j.l.Class Serializable/Externalizable caching
> --------------------------------------------------------------------------
>
>                 Key: HARMONY-5829
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5829
>             Project: Harmony
>          Issue Type: Sub-task
>          Components: DRLVM
>            Reporter: Aleksey Shipilev
>            Assignee: Nathan Beyer
>             Fix For: 5.0M7
>
>         Attachments: vm-kernel-serializable-externalizable-cache-rc1.patch, vm-kernel-serializable-externalizable-cache-rc2.patch, vm-kernel-serializable-externalizable-cache-rc3.patch
>
>
> Serialization workloads relies on Class.isAssignableFrom(...) when looking up Serializable and Externalizable properties (that is, implementation of interfaces). For now, DRLVM kernel classes perform lookups on each invocation. This issue caches the mentioned properties in Class fields and does not go to native VMClassRegistry for resolution.

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