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From "Gavin McDonald" <ga...@16degrees.com.au>
Subject RE: Ubuntu4/5 (juno/janus) filesystem operations are slow in comparison with other Ubuntu1-3.
Date Mon, 26 Nov 2012 00:19:17 GMT


> -----Original Message-----
> From: Keith W [mailto:keith.wall@gmail.com]
> Sent: Monday, 26 November 2012 9:32 AM
> To: builds@apache.org
> Subject: Re: Ubuntu4/5 (juno/janus) filesystem operations are slow in
> comparison with other Ubuntu1-3.
> 
> Hello Builds,
> 
> Would someone by able to answer my query please?
> 
> Thanks in advance, Keith.

Hi Keith, 

I have updated machines.html for janus/juno.

Heres top for Juno:

Tasks: 129 total,   2 running, 127 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.7%us,  0.2%sy,  0.0%ni, 98.8%id,  0.3%wa,  0.0%hi,  0.0%si,
0.0%st
Mem:  16434808k total, 16163256k used,   271552k free,  4382236k buffers
Swap: 31248376k total,   263072k used, 30985304k free,  6737076k cached

So some swapping going on.

HTH

Gav...

> 
> On 12 November 2012 09:09, Keith W <keith.wall@gmail.com> wrote:
> > Hello Builds
> >
> > I'm investigating a regular test failure we (Qpid) see on one of our
> > Jenkins jobs (Qpid-Java-Java-DBY-TestMatrix).  The job is a matrix
> > that is tied to the ubuntu label.   I notice that the test failure (a
> > timeout) seems to occur when ubuntu4 or 5 is chosen as a build slave.
> > Tests that normally take a seconds or less extend to tens of seconds
> > or worse and the job is caught by the build timeout plugin  and a
> > failure results.
> >
> > I'm still investigating, but at the moment, the application logs are
> > pointing to a very slow filesystem as a likely cause.  I also see
> > similar results timing sync and dd commands from a jenkins job.
> > Script fragment and results are below.
> >
> > It would be helpful to me to know the spec of juno and janus machines
> > including their filesystem spec and config (eg. RAID)   (the details
> > are absent from www.apache.org/dev/machines.html).   Are these true
> > machines or guest VMs?  Are you aware of anything else that may cause
> > slow filesystem performance?
> >
> > Kind regards, Keith Wall.
> >
> >
> >
> > Script:
> >
> > time sync
> > sh -c 'dd if=/dev/zero of=ddfile bs=8k count=200000 && sync'
> > time sync
> >
> > ubuntu5
> >
> > time sync (before)
> > real    0m6.513s
> > user    0m0.000s
> > sys     0m0.584s
> > 200000+0 records in
> > 200000+0 records out
> > 1638400000 bytes (1.6 GB) copied, 3.58202 s, 457 MB/s
> > real    0m32.567s
> > user    0m0.016s
> > sys     0m4.116s
> > time sync (after)
> > real    0m1.378s
> > user    0m0.000s
> > sys     0m0.552s
> >
> > ubuntu3 (for comparison):
> >
> > time sync (before)
> > real    0m0.491s
> > user    0m0.000s
> > sys     0m0.372s
> >
> > 1638400000 bytes (1.6 GB) copied, 1.25777 s, 1.3 GB/s
> > real    0m4.696s
> > user    0m0.012s
> > sys     0m1.608s
> >
> > time sync (after)
> > real    0m0.376s
> > user    0m0.000s
> > sys     0m0.364s


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