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Date: Wed, 26 Mar 2014 12:48:19 +0000 (UTC)
From: "Benedict (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
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Subject: [jira] [Updated] (CASSANDRA-6553) Benchmark counter improvements
 (counters++)
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     [ https://issues.apache.org/jira/browse/CASSANDRA-6553?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benedict updated CASSANDRA-6553:
--------------------------------

    Attachment: 6553.txt

AbstractCType.compare() seems to be eating up a lot of time. The attached patch optimises SimpleSparseCellNameType, which on my box brings performance in line with 2.0 _for this workload_. I haven't attempted to improve performance across the board for AbstractCType; it probably requires a separate ticket to address performance improvements.

> Benchmark counter improvements (counters++)
> -------------------------------------------
>
>                 Key: CASSANDRA-6553
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6553
>             Project: Cassandra
>          Issue Type: Test
>            Reporter: Ryan McGuire
>            Assignee: Russ Hatch
>             Fix For: 2.1 beta2
>
>         Attachments: 6553.txt, 6553.uber.quorum.bdplab.read.png, 6553.uber.quorum.bdplab.write.png, high_cl_one.png, high_cl_quorum.png, low_cl_one.png, low_cl_quorum.png, tracing.txt, uber_cl_one.png, uber_cl_quorum.png
>
>
> Benchmark the difference in performance between CASSANDRA-6504 and trunk.
> * Updating totally unrelated counters (different partitions)
> * Updating the same counters a lot (same cells in the same partition)
> * Different cells in the same few partitions (hot counter partition)
> benchmark: https://github.com/apache/cassandra/tree/1218bcacba7edefaf56cf8440d0aea5794c89a1e (old counters)
> compared to: https://github.com/apache/cassandra/tree/714c423360c36da2a2b365efaf9c5c4f623ed133 (new counters)
> So far, the above changes should only affect the write path.


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