Java shared memory

Radek rsmogura at
Mon May 30 18:48:10 UTC 2016

Dear all,

Please don’t think I’m so crazy. Recently I was working on JVM changes to add shared memory / memory mapping support.

I’m able to map part of files as primitive java arrays. First performance results are very optimistic (40% boost in searching min-max long in 1GB file) with mapped long[] as a replacement to LongBuffer. The work is not finished. I have adopted G1, c1 and c2, but I have got mainly stable solution (or I think so).

I see three possible benefits of shared memory:
1. Shared memory and interprocess communication.
2. Mapping large files.
3. Aggressive inter-JVM string de-duplication.

I’m looking for sponsorship for this change, with some guidelines how I can move forward with possible adoption into JDK. If solution would be viable, I would like to open JSR for JDK API modification.

I use as umbrella repo, but I don’t update it quite often.

Thanks in advance,

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