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From "Dave Brosius (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-5896) Stress reports invalid latencies
Date Fri, 16 Aug 2013 05:26:49 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-5896?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dave Brosius updated CASSANDRA-5896:
------------------------------------

    Attachment: 5896.txt

timer is now returning values as nanoseconds, so convert to milliseconds as was expected before.
                
> Stress reports invalid latencies
> --------------------------------
>
>                 Key: CASSANDRA-5896
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5896
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Tools
>            Reporter: Ryan McGuire
>         Attachments: 5896.txt
>
>
> I get this output from trunk:
> {code}
> $ ccm node1 stress
> total,interval_op_rate,interval_key_rate,latency,95th,99th,elapsed_time
> 176678,17667,17667,153510.0,1322730.2,181065524.2,10
> 335566,15888,15888,145371.0,1220290.5,181065524.2,20
> 498488,16292,16292,145535.0,1227675.0,46032966.9,30
> 642012,14352,14352,143999.0,1130215.4,46004055.9,40
> 776083,13407,13407,145573.5,1737871.2,153211818.5,50
> 1000000,22391,22391,145128.0,1336373.6,148773096.0,60
> Averages from the middle 80% of values:
> interval_op_rate          : 15521
> interval_key_rate         : 15521
> latency median            : 146797.7
> latency 95th percentile   : 1327756.5
> latency 99.9th percentile : 121475978.0
> Total operation time      : 00:01:00
> END
> {code}
> Notice the wild latency values.
> Whereas this is the output that I've come to expect (from cassandra-2.0):
> {code}
> $ ccm node1 stress
> total,interval_op_rate,interval_key_rate,latency,95th,99th,elapsed_time
> 157972,15797,15797,0.1,1.2,119.1,10
> 346627,18865,18865,0.1,1.2,118.8,20
> 493937,14731,14731,0.1,1.2,119.2,30
> 663086,16914,16914,0.2,1.3,119.8,40
> 893083,22999,22999,0.1,1.1,65.6,50
> 1000000,10691,10691,0.1,1.1,65.6,55
> Averages from the middle 80% of values:
> interval_op_rate          : 17861
> interval_key_rate         : 17861
> latency median            : 0.1
> latency 95th percentile   : 1.2
> latency 99.9th percentile : 108.5
> Total operation time      : 00:00:55
> END
> {code}

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