[jira] Updated: (HARMONY-5634) [classlib][luni][performance] ObjectInputStream should use HashMap instead of Hashtable for internal storage

["Aleksey Shipilev (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HARMONY-5634?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aleksey Shipilev updated HARMONY-5634:
--------------------------------------

    Attachment: 0002-serial-HashMap.patch

0002-serial-HashMap.patch
Changes the HashMap to Hashtable.

This patch may be committed in this form, presumably it's correct.
However, more beautiful solution will be declaring PRIMITIVE_CLASSES as UnmodifiableHashMap.

This patch gives up to +30% boost on SerialBench running at 8-core Clovertown.

> [classlib][luni][performance] ObjectInputStream should use HashMap instead of Hashtable for internal storage
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: HARMONY-5634
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5634
>             Project: Harmony
>          Issue Type: Improvement
>            Reporter: Aleksey Shipilev
>         Attachments: 0002-serial-HashMap.patch
>
>
> For now, ObjectInputStream uses Hashtable for two storages:
>  1. static PRIMITIVE_CLASSES, populated via static initializer, read by all instances (e.g. in theory by all threads)
>  2. private objectsRead, serving as instance-local buffer
> Both of these storages should be migrated to HashMap, since Hashtable.get is synchronized and synchronization is not needed here.

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