« Return to Thread: [jira] Created: (RVM-341) Improved copying in VM_Memory

[jira] Commented: (RVM-341) Improved copying in VM_Memory

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[ http://jira.codehaus.org/browse/RVM-341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=178981#action_178981 ]

David Grove commented on RVM-341:
---------------------------------

One benchmark to watch is jess. array copies of very small Object[] is a key hotspot for this program.

It's possible that what we should be doing is a hybrid strategy of going inline for things that are short without bothering with fancy alignment code and going out-of-line (memcopy) to things that are big.

> Improved copying in VM_Memory
> -----------------------------
>
> Key: RVM-341
> URL: http://jira.codehaus.org/browse/RVM-341
> Project: RVM
> Issue Type: Improvement
> Components: Instruction Architecture: Intel, Runtime
> Reporter: Ian Rogers
> Fix For: 1000
>
> Attachments: memcpyTest.java, memcpyTestC.c
>
>
> r13857 improved memory copying for Intel with SSE2 so that we used 64bit copies rather than 32bit copies. This gave a large number of speed ups:
> http://jikesrvm.anu.edu.au/cattrack/results/rvmx86lnx32.anu.edu.au/perf/1790/performance_report
> most notably on SpecJBB 2000. There is a low-hanging fruit to improve this further, for example, by using 128bit copies and using more than 1 register to do the copying.

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« Return to Thread: [jira] Created: (RVM-341) Improved copying in VM_Memory