Mailing-List: contact commits-help@harmony.apache.org; run by ezmlm
Precedence: bulk
Reply-To: dev@harmony.apache.org
Message-ID: <477920650.1216458032006.JavaMail.jira@brutus>
Date: Sat, 19 Jul 2008 02:00:32 -0700 (PDT)
From: "Aleksey Shipilev (JIRA)" <jira@apache.org>
To: commits@harmony.apache.org
Subject: [jira] Updated: (HARMONY-5920) [classlib][pack200][performance]
 ArrayList usage optimization
In-Reply-To: <1168469268.1216457911685.JavaMail.jira@brutus>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit


     [ 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.

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