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From "Aleksey Shipilev (JIRA)" <j...@apache.org>
Subject [jira] Closed: (HARMONY-5920) [classlib][pack200][performance] ArrayList usage optimization
Date Mon, 21 Jul 2008 13:01:31 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-5920?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Aleksey Shipilev closed HARMONY-5920.
-------------------------------------


Applied OK, thanks.

> [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
>            Assignee: Sian January
>             Fix For: 5.0M7
>
>         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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