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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-2749) 1.6.0RC4 slower than 1.5.1
Date Thu, 01 May 2014 05:26:16 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-2749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13986358#comment-13986358
] 

Josh Elser commented on ACCUMULO-2749:
--------------------------------------

Oh, also, enabling {{-fno-omit-frame-pointer}} is pretty pointless since any optimization
flag to GCC disables it (I believe the optimization overrides the flag). Regardless, the normal
user probably isn't going to be debugging the library, and, as such, building it with that
flag is probably unnecessary.

> 1.6.0RC4 slower than 1.5.1
> --------------------------
>
>                 Key: ACCUMULO-2749
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-2749
>             Project: Accumulo
>          Issue Type: Bug
>            Reporter: Keith Turner
>            Assignee: Eric Newton
>             Fix For: 1.6.0
>
>         Attachments: gcc-lol.png, ingest_test.diff
>
>
> I am seeing consistently slower write rates when comparing 1.5.1 and 1.6.0 RC4.   Following
env :
>    * hadoop 2.2.0
>    * Zookeeper 3.4.5
>    * Centos 6 (native, not a VM)
>    * using examples/3GB/native-standalone config
>    * setting tserver.mutation.queue.max 4M
>    * I am running test/system/test1/ingest_test.sh
>    * single node
> Saw the following rates
> {noformat}
>   1.5.1 aggregate rate : 200,806 records/sec
>   1.6.0 aggregate rate : 181,264 records/sec (90%)
> {noformat}
> Reran test setting  table.walog.enabled=false
> {noformat}
>   1.5.1 aggregate rate : 302,307 records/sec
>   1.6.0 aggregate rate : 232,685 records/sec (77%)
> {noformat}
> Since the relative performance gap seemed to widen when disabling walog I tried another
test where I disabled walogs and set the devnull iterator 
> {noformat}
>   1.5.1 aggregate rate : 554,853 records/sec
>   1.6.0 aggregate rate : 373,556 records/sec (67%)
> {noformat}
> The relative performance gap grew even further.
> Used the following command to enable dev null iterator in 1.5.1 and RC4
> {noformat}
> config -t test_ingest -s table.iterator.minc.devnull=10,org.apache.accumulo.core.iterators.DevNull
> {noformat}



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