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Posted to commits@harmony.apache.org by "Aleksey Shipilev (JIRA)" <ji...@apache.org> on 2008/07/19 11:00:32 UTC
[jira] Updated: (HARMONY-5920) [classlib][pack200][performance]
ArrayList usage optimization
[ https://issues.apache.org/jira/browse/HARMONY-5920?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Aleksey Shipilev updated HARMONY-5920:
--------------------------------------
Attachment: pack200-arraylist-v3.patch
pack200-arraylist-v3.patch
Proposed patch, incorporates HARMONY-5919.
Successfully passes JUnit tests.
Gives +10% on unpacking scenario.
> [classlib][pack200][performance] ArrayList usage optimization
> -------------------------------------------------------------
>
> Key: HARMONY-5920
> URL: https://issues.apache.org/jira/browse/HARMONY-5920
> Project: Harmony
> Issue Type: Improvement
> Environment: Latest pack200
> Reporter: Aleksey Shipilev
> Attachments: pack200-arraylist-v3.patch
>
>
> 1. Microbenchmark on Sun 1.6.0_05 shows that iterating ArrayList via iterators is 3x slower than iterating via get(). This issue eliminates iterator() in favor of get().
> 2. ArrayList-s are frequently instantiated with default capacity, even when the storage size is known. This issue sets the default capacities where applicable.
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