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From "Chen Yang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-5146) [drlvm][gc]Allocation Prefetch in Garbage Collector
Date Mon, 19 Nov 2007 06:43:43 GMT
[drlvm][gc]Allocation Prefetch in Garbage Collector
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                 Key: HARMONY-5146
                 URL: https://issues.apache.org/jira/browse/HARMONY-5146
             Project: Harmony
          Issue Type: Improvement
          Components: DRLVM
         Environment: Win32/Win64/Linux32 have already been verified
            Reporter: Chen Yang


Allocation Prefetch is known to be effective in improving the application performance, this
patch is based on the study on current allocation implementation in garbage collector and
has already been evaluated. Some options are provided:
   -XX:gc.prefetch=true/false	                     ; to enable or disable the allocation prefetch,
default false
   -XX:gc.zeroing_size=N		; to specify the number of bytes in group memset, default 256
   -XX:gc.prefetch_stride=N		; to specify the number of bytes of prefetch stride, default
64
   -XX:gc.prefetch_distance=N	                     ; to specify the number of bytes to be
prefetched, default 1024
   To get the best performance, it is expected to select appropriate parameters.


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