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From "Jun Rao (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (CASSANDRA-444) improve throughput for normal inserts on many-core systems
Date Thu, 17 Sep 2009 23:45:57 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12756859#action_12756859
] 

Jun Rao edited comment on CASSANDRA-444 at 9/17/09 4:45 PM:
------------------------------------------------------------

The patch looks fine. Did the same test as in http://issues.apache.org/jira/browse/CASSANDRA-445
with the patch. The results are:
run1: 2m42s
run2: 2m32s

Doesn't seem to improve performance much.

Could you add a link to how the concurrency bug in NonBlockingHashMap was fixed?

Can I commit #445 before this one?


      was (Author: junrao):
    The patch looks fine. Did the same test as in http://issues.apache.org/jira/browse/CASSANDRA-445
with the patch. The results are:
run1: 2m42s
run2: 2m32s

Doesn't seem to improve performance much.

Could you add a link to how the concurrency bug in NonBlockingHashMap was fixed?

Can I commit #444 before this one?

  
> improve throughput for normal inserts on many-core systems
> ----------------------------------------------------------
>
>                 Key: CASSANDRA-444
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-444
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jonathan Ellis
>            Assignee: Jonathan Ellis
>             Fix For: 0.5
>
>         Attachments: 0001-CASSANDRA-444-move-per-key-locking-inside-Memtable-and.txt,
0002-serialize-row-outside-of-commitlog-executor-to-improve.txt, 0003-use-putIfAbsent-to-avoid-locking-on-first-insert.txt
>
>
> move the serialization of commitlog Row to the calling thread, not the CL executor
> shard the memtable lock
> others?

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