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From "Eric Newton (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-2749) 1.6.0RC4 slower than 1.5.1
Date Wed, 30 Apr 2014 17:30:16 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-2749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13985780#comment-13985780
] 

Eric Newton commented on ACCUMULO-2749:
---------------------------------------

I saw a 25% improvement with gcc 4.4.7, when compiled with -O3, instead of -O2.  Maybe if
we have [~elserj] use -O3 we can go even faster! 

> 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: 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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