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Subject: Re: [hwloc-devel] Something lighter-weight than XML?
From: Christopher Samuel (samuel_at_[hidden])
Date: 2011-09-05 03:58:10


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On 02/09/11 19:54, Jeff Squyres wrote:

> Fail enough,

Nice Freudian slip. :-)

> but do the back-end nodes have libxml?

Apparently so..

rpm --root /bgsys/drivers/ppcfloor/linux/OS -qa | grep -i xml
libxml2-2.6.23-22

That's the I/O node filesystem, which is what the compute node
kernel maps I/O's back to I believe. Mind you most people on
BG do statically linking as dynamic linking is rather new there.

> For us to do what we want, it would need to be available on
> all nodes because the OMPI orted processes would be querying
> hwloc for the local topology and then sending it to the "head"
> node process (usually mpirun) for further analysis and process
> mapping.

Umm, not sure that'll work on a BG because you can't fork() or
execve() on a BG, the IBM mpirun runs on the login node and talks
to an mpirund on the service node which then launches the users
code on the compute nodes via the Navigator API.

cheers,
Chris
- --
    Christopher Samuel - Senior Systems Administrator
 VLSCI - Victorian Life Sciences Computation Initiative
 Email: samuel_at_[hidden] Phone: +61 (0)3 903 55545
         http://www.vlsci.unimelb.edu.au/

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