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From "Xiao-Feng Li" <xiaofeng...@gmail.com>
Subject Re: [jira] Commented: (HARMONY-5759) [drlvm][gc][performance] Alignment of GC blocks could improve the performance of FP benchmarks
Date Fri, 18 Apr 2008 00:06:21 GMT
Aleksey, the patch looks good.

Could you change "BLOCK_BASE_ALIGNMENT" to be
"GC_BLOCK_BODY_ALIGNMENT"?  BASE actually refers to the start of a
block. BODY is the start of the allocatable area.  (And same to
BLOCK_BASE_ALIGN_MASK). Thanks.

I will commit after you make the modification.

Thanks,
xiaofeng

On Fri, Apr 18, 2008 at 1:01 AM, Aleksey Shipilev (JIRA)
<jira@apache.org> wrote:
>
>     [ https://issues.apache.org/jira/browse/HARMONY-5759?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12590102#action_12590102
]
>
>  Aleksey Shipilev commented on HARMONY-5759:
>  -------------------------------------------
>
>  RC1 patch gives astonishing +30% boost to composite SciMark2 score.
>
>  $ ../../builds/shade.r649000.CLEAN/bin/java -Xem:server jnt.scimark2.commandline
>
>  SciMark 2.0a
>
>  Composite Score: 257.2925459369102
>  FFT (1024): 324.4495281837533
>  SOR (100x100):   364.95358549804746
>  Monte Carlo : 61.79453602352396
>  Sparse matmult (N=1000, nz=5000): 265.54295673436866
>  LU (100x100): 269.7221232448578
>
>  java.vendor: Apache Software Foundation
>  java.version: 1.5.0
>  os.arch: x86
>  os.name: Windows XP
>  os.version: 5.1
>
>  20:55:23 (189) /cygdrive/c/Harmony.new/test/Scimark
>   $ ../../builds/shade.r649000.GCB/bin/java -Xem:server jnt.scimark2.commandline
>
>  SciMark 2.0a
>
>  Composite Score: 335.49067843718
>  FFT (1024): 317.1346618181818
>  SOR (100x100):   592.9092332307692
>  Monte Carlo : 64.09633310436254
>  Sparse matmult (N=1000, nz=5000): 270.69805822691814
>  LU (100x100): 432.6151058056684
>
>  java.vendor: Apache Software Foundation
>  java.version: 1.5.0
>  os.arch: x86
>  os.name: Windows XP
>  os.version: 5.1
>
>
>  > [drlvm][gc][performance] Alignment of GC blocks could improve the performance of
FP benchmarks
>  > ----------------------------------------------------------------------------------------------
>  >
>  >                 Key: HARMONY-5759
>  >                 URL: https://issues.apache.org/jira/browse/HARMONY-5759
>  >             Project: Harmony
>  >          Issue Type: Improvement
>  >            Reporter: Aleksey Shipilev
>  >         Attachments: vm-gc-blocksize-rc1.patch
>  >
>  >
>  > This issue defines the block alignment to be separated from object alignment. This
would allow to leave the object alignment at 4 and not to waste precious memory, but on other
hand will open the way for alignment of GC blocks to 8 thus increasing the chances that data
requiring 8/16 alignment will layout in memory properly.
>
>  --
>  This message is automatically generated by JIRA.
>  -
>  You can reply to this email to add a comment to the issue online.
>
>



-- 
http://xiao-feng.blogspot.com

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