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Date: Tue, 12 Feb 2008 05:25:08 -0800 (PST)
From: "Aleksey Shipilev (JIRA)" <jira@apache.org>
To: commits@harmony.apache.org
Subject: [jira] Commented: (HARMONY-5396) [drlvm][em] excess ValueProfiler
 locking causes degradation on JITted code with profiling
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    [ https://issues.apache.org/jira/browse/HARMONY-5396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12568105#action_12568105 ] 

Aleksey Shipilev commented on HARMONY-5396:
-------------------------------------------

> I think, this is enough to prove that we can move on with the current precision 
Egor, the thing is, lack of accurate profiling can cause _intermittent_ performance degradations, which we wouldn't quickly notice. That's the price we would pay for speed of startup, and then we should resort to inaccurate profiling only in case of startup-important workloads. I think precise (e.g. locked) profiling should reside as default.

> [drlvm][em] excess ValueProfiler locking causes degradation on JITted code with profiling
> -----------------------------------------------------------------------------------------
>
>                 Key: HARMONY-5396
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5396
>             Project: Harmony
>          Issue Type: Improvement
>          Components: DRLVM
>            Reporter: Aleksey Shipilev
>            Assignee: Egor Pasko
>         Attachments: 0001-ValueProfileCollector-refactoring-to-separate-FirstN-and-Divided-methods.txt, 0002-value-profiling-options-locked-flagged_all-flagged_insert-unsafe.txt, 0002-ValueProfileCollector-implementing-locking-strategies.txt, 0003-value-profiling-options-locked-flagged_all-flagged_insert-unsafe.txt, HARMONY-5396-syncTie.patch
>
>
> During investigation of serious slowdown in some microbenchmark, excess locking in ValueProfiler was identified. 
> Please see Harmony-dev thread for the details: http://markmail.org/message/tatsfbyb7eb3q3rr

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