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. William
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