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From "Nick Pentreath (JIRA)" <>
Subject [jira] [Commented] (SPARK-11968) ALS recommend all methods spend most of time in GC
Date Mon, 27 Feb 2017 11:50:48 GMT


Nick Pentreath commented on SPARK-11968:

While working on performance testing for ALS parity I've got a possible solution for this.

Will update once I have some more concrete numbers.

> ALS recommend all methods spend most of time in GC
> --------------------------------------------------
>                 Key: SPARK-11968
>                 URL:
>             Project: Spark
>          Issue Type: Improvement
>          Components: ML, MLlib
>    Affects Versions: 1.5.2, 1.6.0
>            Reporter: Joseph K. Bradley
>            Assignee: Nick Pentreath
> After adding recommendUsersForProducts and recommendProductsForUsers to ALS in spark-perf,
I noticed that it takes much longer than ALS itself.  Looking at the monitoring page, I can
see it is spending about 8min doing GC for each 10min task.  That sounds fixable.  Looking
at the implementation, there is clearly an opportunity to avoid extra allocations: []
> CC: [~mengxr]

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