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From "Runping Qi (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-2608) Reading sequence file consumes 100% cpu with maximum throughput being about 5MB/sec per process
Date Thu, 17 Jan 2008 06:08:36 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-2608?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12559815#action_12559815
] 

Runping Qi commented on HADOOP-2608:
------------------------------------

Forgot one point: when scanning sequence files with JuteRecord with buffer instead of ustring
type, the cpu
was fluctuating between 50% and 100%.

So it was no longer  completely cpu bounded.

> Reading sequence file consumes 100% cpu with maximum throughput being about 5MB/sec per
process
> -----------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-2608
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2608
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: io
>            Reporter: Runping Qi
>
> I did some tests on the throughput of scanning block-compressed sequence files.
> The sustained throughput was bounded at 5MB/sec per process, with the cpu of each process
maxed at 100%.
> It seems to me that the cpu consumption is too high and the throughput is too low for
just scanning files.

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