> Am 06.11.2015 um 11:14 schrieb William Hay <w....@ucl.ac.uk>: > > On Fri, Nov 06, 2015 at 02:32:21PM +0800, Wei-Zhao Lu wrote: >> HI ALL, >> >> I have problem about openmpi. >> I used openmpi 1.6.5 and ran parallel job normally. >> >> I upgrade openmpi to 1.8.7 to run the same parallel job failed. >> the error message is >> -------------------------------------------------------------------------- >> There are not enough slots available in the system to satisfy the 4 slots >> that were requested by the application: >> ./cpi >> >> Either request fewer slots for your application, or make more slots >> available >> for use. >> There are not enough slots available in the system to satisfy the 4 slots >> that were requested by the application: >> ./cpi >> >> Either request fewer slots for your application, or make more slots >> available >> for use. >> -------------------------------------------------------------------------- >> >> Because I want each node serve for 1 job, so I configured as follow: >> $ qconf -sq all.q | grep slots >> slots 1 >> How to fix the problem. Thanks. > > My best guess is that your 1.8.7 has grid engine support built in and > therefore when run > under grid engine it only sees as many slots as grid engine allocates. So > that provides > a couple of options: > > i)Disable grid-engine support if mpirun doesn't provide a switch (I can't > recall) then > you can probably do this by having the job script unset a few of the > variables grid engine sets > > ii)Ensure grid engine allocates as many slots as you require. Change all.q > to have > a number of slots equal to the number of cores on the node (or however many > you think > you will need if that differs for some reason). Add an exclusive resource > (see the complex manpage) > to each host. When submitting a job make sure you request a pe with the > appropriate number of slots > and the exclusive resource. > > The second is the cleaner way to do it but does involve changing how people > submit jobs.
I definitely recommend the second option too. To ease the handling for the users, a JSV could add the exclusive resource in case a particular PE is requested. It could also adjust the number of requested slots from any value to the range "1-" to use the complete node, independent from the number of built-in cores which may vary between machines. -- Reuti > William > > _______________________________________________ > users mailing list > users@gridengine.org > https://gridengine.org/mailman/listinfo/users
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