> -----Original Message----- > From: Keith W [mailto:[email protected]] > Sent: Monday, 26 November 2012 9:32 AM > To: [email protected] > 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 <[email protected]> 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
