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From "Rob Davies (JIRA)" <>
Subject [jira] Resolved: (AMQ-1386) Very slow on Solaris/Linux when commiting transactions
Date Sat, 29 Aug 2009 06:21:15 GMT


Rob Davies resolved AMQ-1386.

       Resolution: Working as Designed
    Fix Version/s:     (was: 5.4.0)

sync to disk on a transaction boundary is going to be slow. You can configure not to do this
- depends on the store used

> Very slow on Solaris/Linux when commiting transactions
> ------------------------------------------------------
>                 Key: AMQ-1386
>                 URL:
>             Project: ActiveMQ
>          Issue Type: Bug
>    Affects Versions: 4.1.1, 5.2.0
>         Environment: Solaris 10 on T2000, SUSE Enterprise linux 10 on DELL AMD64, Debian
testing on AMD Turion laptop, SUSE8 on DELL amd
>            Reporter: robert huitema
>            Assignee: Rob Davies
>             Fix For: 5.3.0
>         Attachments:
> All these systems show a very severe slowdown in TPS when each read is commited. this
varies with the system, but is generally 100 times less than when I commit every 1000 reads.
I have investigated and applied the fixes found so far, including the tcp_nodelay, net.ipv4.tcp_abc,
and misc system fixes. The problem exhibits across localhost and network, and on Seebeyonds
stcms IQManager. 
> I have attached a test harness which should show the problem.
> Summary of speeds:
> localhost windows desktop PC:  commit 1000: 3900 tps, commit each:1300 tps
> DELL AMD64:  commit 1000: 8000tps, commit each: 30tps
> SunT2000: commit 1000:700tps, commit each; 15tps
> linux laptop: commit 1000: 2500 tps, commit each: 200 tps
> Hope you can help, we have been at this in depth for a while now :-(
> rgds
> rob

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