Hello Builds, Would someone by able to answer my query please?
Thanks in advance, Keith. 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
