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From "Mikhail Fursov (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-4010) [drlvm][jit] Memory management improvement in Jitrino.OPT compiler
Date Thu, 31 May 2007 10:20:15 GMT
[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

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
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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