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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15536) Make AsyncFSWAL as our default WAL
Date Fri, 01 Apr 2016 08:50:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15221395#comment-15221395
] 

Duo Zhang commented on HBASE-15536:
-----------------------------------

So we are using more CPUs with asyncwal? But actually we spend less cycles with asyncwal(Yeah
you said, less work)? What does the '2.597 GHz' mean?

And for the IPC, I remember the time when I was a graduate student who was learning how to
do 'software pipeline' and 'instruction scheduling' in a compiler... But usually these optimizations
are only useful on loops and I can not find a heavy loop in {{AsyncFSWAL}}... And it is interesting
that we have a less branch-miss rate but a less IPC...
Maybe we need to find the hot spots in {{AsyncFSWAL}} first?

Thanks.

> Make AsyncFSWAL as our default WAL
> ----------------------------------
>
>                 Key: HBASE-15536
>                 URL: https://issues.apache.org/jira/browse/HBASE-15536
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Duo Zhang
>
> As it should be predicated on passing basic cluster ITBLL



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