[Swift-user] Passing hostType for MPI jobs

[Andriy Fedorov]

> But finally...
>
>  <extensions>
>    <resourceAllocationGroup>
>        <hostType>ia64-compute</hostType>
>        <hostCount>5</hostCount>
>        <cpusPerHost>1</cpusPerHost>
>    </resourceAllocationGroup>
>  </extensions>
>
> allocates 5 hosts.
>
> So it looks like you need to specify both hostCount and cpusPerHost.
>

Ok, I tried that. It indeed allocates correct number of the requested
hosts. But, there's still a problem. It appears that only one instance
of the executable is running, at least when I specify jpbType to mpi.
I am not sure it is being run as an MPI job. I have a simple mpi code
that outputs rank and COMM_WORLD size, ant the test says I have the
total of 1 process, when I submit my job with the following job
specification:

        <executable>/home/fedorov/local/bin/hello_mpi</executable>

        <stdout>/home/fedorov/scratch/hello_mpi_xml.stdout</stdout>
        <stderr>/home/fedorov/scratch/hello_mpi_xml.stderr</stderr>

        <maxWallTime>10</maxWallTime>

        <jobType>mpi</jobType>

        <extensions>
        <resourceAllocationGroup>
        <hostType>compute</hostType>
        <hostCount>4</hostCount>
        <cpusPerHost>1</cpusPerHost>
        <count>4</count>
        </resourceAllocationGroup>
        </extensions>

Ben, can you try to run some MPI executable, and see if it works for you?

By the way, I also discovered, that sometimes the order of tags in
.xml makes difference (meaning, with certain order of "count",
"walltime" and "hostCount" globusrun-ws will abort). I had no idea
order matters...

Andrey