[slurm-users] srun and mpirun

Mahmood Naderan mahmood.nt at gmail.com
Fri Apr 13 09:33:13 MDT 2018

I tried with one of the NAS benchmarks (BT) with 121 threads since the
number of cores should be square. With srun, I get

 WARNING: compiled for   121 processes
 Number of active processes:     1

           0           1         408         408         408
  Problem size too big for compiled array sizes

However, with mpirun, it seems to be fine

 Number of active processes:   121

 Time step    1
 Time step   20


On Fri, Apr 13, 2018 at 5:46 PM, Chris Samuel <chris at csamuel.org> wrote:
> On 13/4/18 7:19 pm, Mahmood Naderan wrote:
>> I see some old posts on the web about performance comparison of srun vs.
>> mpirun. Is that still an issue?
> Just running an MPI hello world program is not going to test that.
> You need to run an actual application that is doing a lot of
> computation and communications instead.  Something like NAMD
> or a synthetic benchmark like HPL.
> All the best,
> Chris
> --
>  Chris Samuel  :  http://www.csamuel.org/  :  Melbourne, VIC

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