systemml-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Matthias Boehm (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SYSTEMML-2073) Lost update on high frequency statistics maintenance
Date Thu, 08 Mar 2018 02:14:00 GMT

     [ https://issues.apache.org/jira/browse/SYSTEMML-2073?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matthias Boehm updated SYSTEMML-2073:
-------------------------------------
    Issue Type: Sub-task  (was: Bug)
        Parent: SYSTEMML-2061

> Lost update on high frequency statistics maintenance
> ----------------------------------------------------
>
>                 Key: SYSTEMML-2073
>                 URL: https://issues.apache.org/jira/browse/SYSTEMML-2073
>             Project: SystemML
>          Issue Type: Sub-task
>            Reporter: Matthias Boehm
>            Assignee: Matthias Boehm
>            Priority: Major
>             Fix For: SystemML 1.1
>
>
> The recently introduced lock-free statistics maintenance (SYSTEMML-2069) has an issue
of lost updates under high-frequency updates of hot opcodes. For example, the following script
> {code}
> parfor(j in 1:24)
>    for(i in 1:10000000)
>      q = nrow(Y);
> {code}
>  
> gives the following statistics (counts of 240,000,000 are expected here)
> {code}
>  #  Instruction  Time(s)      Count
>  1  nrow          95.118  239999993
>  2  mvvar         64.423  239999957
> {code}
>  



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)

Mime
View raw message