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From "Ananda Verma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SYSTEMML-1894) Switch log from FastMath to Math
Date Fri, 08 Sep 2017 16:11:00 GMT

    [ https://issues.apache.org/jira/browse/SYSTEMML-1894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16158852#comment-16158852
] 

Ananda Verma commented on SYSTEMML-1894:
----------------------------------------

[~mboehm7] I would like to work on this issue. Can you assign it to me.

> Switch log from FastMath to Math
> --------------------------------
>
>                 Key: SYSTEMML-1894
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-1894
>             Project: SystemML
>          Issue Type: Sub-task
>            Reporter: Matthias Boehm
>             Fix For: SystemML 1.0
>
>
> Currently, SystemML uses FastMath instead of Math for certain builtin operations. However,
recent experiments with JDK 8 on different platforms have shown that for log this is no longer
beneficial and actually leads to a slowdown of up to 30%.
> For example, on a scenario of 20 iterations of log(X), where X is a 10K x 10K dense matrix,
we obtained the following results:
> {code}
> log w/ FastMath: 85.2s
> log w/ Math: 65.6s
> {code}
> Hence, this task aims to replace FastMath.log with Math.log in all occurrences in SystemML
runtime and code generation framework. 



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