[jira] [Commented] (CASSANDRA-7442) Parallelize unit test runner

["Philip Thompson (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-7442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14043943#comment-14043943 ] 

Philip Thompson commented on CASSANDRA-7442:
--------------------------------------------

I'm seeing similar improvements in time on Linux (15m to 6m) and Windows (30m to 18m). I had no issues setting -Dtest.runners higher than the number of cores.

> Parallelize unit test runner
> ----------------------------
>
>                 Key: CASSANDRA-7442
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7442
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Tools
>            Reporter: T Jake Luciani
>            Assignee: T Jake Luciani
>            Priority: Minor
>              Labels: qa-resolved
>             Fix For: 2.1.0
>
>         Attachments: 7442.txt
>
>
> Currently we spend ~15 minutes running unit tests.
> We can parallelize the unit tests by splitting the classes up across processes and using more cores.
> This patch adds a new variable -Dtest.runners=X (default is 1)
> Running with 4 runtime goes from 15min to 6min. 
> Beyond 1 runner per core I don't see much of a difference



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