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From "Shawn Kumar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-7217) Native transport performance (with cassandra-stress) drops precipitously past around 1000 threads
Date Thu, 06 Nov 2014 18:31:34 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-7217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14200604#comment-14200604
] 

Shawn Kumar commented on CASSANDRA-7217:
----------------------------------------

I'll be continuing testing on a more cpu-perfomant instance but thought I would briefly try
the cstar_perf on bdplab. [Here|http://cstar.datastax.com/graph?stats=dd73c4a6-65d9-11e4-9413-bc764e04482c&metric=op_rate&operation=1_write&smoothing=1&show_aggregates=true&xmin=0&xmax=279.07&ymin=0&ymax=120665.6]
are the results - I increase the threads from 500 - 1500 in 250 thread increments from the
first operation to the last and it seems like there is a noticeable drop.

> Native transport performance (with cassandra-stress) drops precipitously past around
1000 threads
> -------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-7217
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7217
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Benedict
>            Assignee: Shawn Kumar
>              Labels: performance, triaged
>             Fix For: 2.1.2
>
>
> This is obviously bad. Let's figure out why it's happening and put a stop to it.



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