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From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SYSTEMML-2278) Performance issues spark ctable(X,Y) w/ large num distinct
Date Wed, 25 Apr 2018 07:29:00 GMT

     [ https://issues.apache.org/jira/browse/SYSTEMML-2278?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matthias Boehm updated SYSTEMML-2278:
-------------------------------------
    Summary: Performance issues spark ctable(X,Y) w/ large num distinct  (was: Performance
issues spark table(X,Y) w/ large num distinct)

> Performance issues spark ctable(X,Y) w/ large num distinct
> ----------------------------------------------------------
>
>                 Key: SYSTEMML-2278
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-2278
>             Project: SystemML
>          Issue Type: Task
>            Reporter: Matthias Boehm
>            Priority: Major
>
> {code}
> N = 1e9
> X = seq(1,N);
> Y = 1+seq(1,N)/1000;
> while(FALSE){}
> Z = table(X,Y)
> while(FALSE){}
> print(sum(Z));
> {code}



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