Tsz Wo Nicholas Sze created HADOOP-10674:
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Summary: Rewrite the PureJavaCrc32 loop for performance improvement
Key: HADOOP-10674
URL: https://issues.apache.org/jira/browse/HADOOP-10674
Project: Hadoop Common
Issue Type: Bug
Components: performance, util
Reporter: Tsz Wo Nicholas Sze
Assignee: Tsz Wo Nicholas Sze
Below are some performance improvement opportunities performance improvement in
PureJavaCrc32.
- eliminate "off += 8; len -= 8;"
- replace T8_x_start with hard coded constants
- eliminate c0 - c7 local variables
In my machine, there are 30% to 50% improvement for most of the cases.
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