[mpich-discuss] Using MPICH and Hydra to manage apruns

[Kenneth Raffenetti]

Hi Justin,

You can disable cobalt by adding this to your Hydra/MPICH configure:

   --with-hydra-bss=user,ssh,rsh,fork,slurm,ll,lsf,sge,pbs,manual,persist

This is basically the default setting minus cobalt.

Ken

On 04/27/2018 10:37 AM, Justin M Wozniak wrote:
> Hi
>      I am trying to use an MPI program to manage an ensemble of apruns 
> under Cobalt on Theta.  I compiled an MPICH 3.2 for the login node. 
> Then, in an interactive allocation, I do:
> 
> $ hostname
> thetamom2
> 
> $ mpiexec -launcher fork -n 1 echo hi
> [mpiexec at thetamom2] HYDU_parse_hostfile (utils/args/args.c:319): unable 
> to open host file: /var/tmp/cobalt.222331
> [mpiexec at thetamom2] HYDT_bscd_cobalt_query_node_list 
> (tools/bootstrap/external/cobalt_query_node_list.c:27): error parsing 
> hostfile
> [mpiexec at thetamom2] HYDT_bsci_query_node_list 
> (tools/bootstrap/src/bsci_query_node_list.c:19): RMK returned error 
> while querying node list
> [mpiexec at thetamom2] main (ui/mpich/mpiexec.c:186): unable to query the 
> RMK for a node list
> 
> It looks like Hydra has detected that it is under Cobalt.  How do I 
> force it to ignore Cobalt?
> 
> Ultimately, I plan to replace 'echo' with a shell script that does an 
> aprun.
> 
>      Thanks
> 
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