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https://issues.apache.org/jira/browse/SPARK-10307?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joseph K. Bradley resolved SPARK-10307.
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Resolution: Cannot Reproduce
> Fix regression in block matrix multiply (1.4->1.5 regression)
> -------------------------------------------------------------
>
> Key: SPARK-10307
> URL: https://issues.apache.org/jira/browse/SPARK-10307
> Project: Spark
> Issue Type: Improvement
> Components: MLlib
> Affects Versions: 1.5.0
> Reporter: Joseph K. Bradley
> Assignee: Joseph K. Bradley
> Priority: Critical
>
> Running spark-perf on the block-matrix-mult test (BlockMatrix.multiply), I
> found the running time increased from 50 sec to 80 sec. This was on the
> default test settings, on 16 r3.2xlarge workers on EC2, and with 15 trials,
> dropping the first 2.
> The only relevant changes I found are:
> *
> [https://github.com/apache/spark/commit/520ad44b17f72e6465bf990f64b4e289f8a83447]
> *
> [https://github.com/apache/spark/commit/99c40cd0d8465525cac34dfa373b81532ef3d719]
> I'm testing reverting each of those now.
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