Adam Purkiss wrote:
I too have seen this kind of cpu load from sequoia (with mysql running
at about 80%)
It would be interesting to run the profiling as well in that case.
There are a number of reasons that could be the cause for a high cpu usage:
- improper JVM memory settings leading to GC hyperactivity
- bad caching settings
- problems in network stack configuration (group communication, Nagle
algorithm on some platforms...)
- problems in the database JDBC driver
- operating system scheduler with a large number of threads
Without more information about the setup and some basic profiling it
will hard to diagnose what is exactly going on.
Thanks for your interest in Sequoia,
Emmanuel
------------------------------------------------------------------------
> Date: Wed, 30 Jul 2008 12:37:58 -0400
> From: [EMAIL PROTECTED]
> To: [email protected]
> Subject: Re: [Sequoia] Sequoia process CPU too big in Load Tests
> CC: [EMAIL PROTECTED];
[EMAIL PROTECTED];
[EMAIL PROTECTED];
[EMAIL PROTECTED];
[EMAIL PROTECTED];
[EMAIL PROTECTED]
>
> Hi Toni,
>
> It would be interesting to know where Sequoia actually spends its time.
> Could you turn the CPU profiling in the JVM to get an idea of what is
> going on?
> Also what does your configuration look like?
>
> Thanks for the feedback,
> Emmanuel
> >
> > We are doing some load test of on product using JBOSS, Sequoia and
> > MySQL, and in our test we have notice that sequoia get a very big,
> > big, big quantity of CPU...
> >
> > Look top in machine where the service is processes ( nearly
150%cpu ),
> > we are talking about servers with 2 CPUS :
> >
> >
> > top - 14:36:31 up 25 days, 22:28, 2 users, load average: 6.87, 6.53,
> > 3.66
> > Tasks: 104 total, 1 running, 103 sleeping, 0 stopped, 0 zombie
> > Cpu(s): 59.0% us, 8.1% sy, 0.0% ni, 29.6% id, 0.7% wa, 0.3% hi,
> > 2.3% si
> > Mem: 8164704k total, 5899548k used, 2265156k free, 387168k buffers
> > Swap: 8385920k total, 0k used, 8385920k free, 3190788k cached
> >
> > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
> > COMMAND
> > 26562 sequoia 17 0 2010m 366m 14m S 150 4.6 16:28.59
> > java
> > 5809 jboss 25 0 2049m 1.1g 73m S 89 14.7 11:55.62
> > java
> > 21342 mysql 16 0 544m 371m 4872 S 37 4.7 43:01.14
> > mysqld
> >
> > And this in the BE which is not processing any traffic :
> >
> > top - 14:42:00 up 25 days, 22:33, 2 users, load average: 3.99, 4.57,
> > 3.67
> > Tasks: 104 total, 1 running, 103 sleeping, 0 stopped, 0 zombie
> > Cpu(s): 36.8% us, 5.2% sy, 0.0% ni, 54.9% id, 0.4% wa, 0.3% hi,
> > 2.3% si
> > Mem: 8164704k total, 5968124k used, 2196580k free, 387396k buffers
> > Swap: 8385920k total, 0k used, 8385920k free, 3262028k cached
> >
> > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+
> > COMMAND
> > 26562 sequoia 17 0 1966m 365m 14m S 141 4.6 22:42.70
> > java
> > 21342 mysql 16 0 545m 371m 4872 S 35 4.7 44:32.83 mysqld
> >
--
Emmanuel Cecchet
FTO @ Frog Thinker
Open Source Development & Consulting
--
Web: http://www.frogthinker.org
email: [EMAIL PROTECTED]
Skype: emmanuel_cecchet
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