[jira] Updated: (HARMONY-4010) [drlvm][jit] Memory management improvement in Jitrino.OPT compiler

["Mikhail Fursov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HARMONY-4010?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mikhail Fursov updated HARMONY-4010:
------------------------------------

    Attachment: mm.diff

> [drlvm][jit] Memory management improvement in Jitrino.OPT compiler
> ------------------------------------------------------------------
>
>                 Key: HARMONY-4010
>                 URL: https://issues.apache.org/jira/browse/HARMONY-4010
>             Project: Harmony
>          Issue Type: Improvement
>          Components: DRLVM
>            Reporter: Mikhail Fursov
>         Attachments: mm.diff
>
>
> The MemoryManager class has "initial size" parameter and it's usage is misleading.
> Once set this parameter works as default arena size for all arenas allocated by this memory manager.
> I did a code review and see that in 90% of cases this parameter is not used correctly and default value is used (4k per arena).
> The problem is that sometimes the initial size is set to very large values for a global memory managers (like 128*method size  which is about  5Mb for a large methods ). Once this parameter is set, every new arena in memory manager will have the same size, making JIT to ask a large memory chunks from OS when it's not needed and causing a problems in environments with high memory pressure.
> I propose removing this parameter at all.

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