On Apr 24, 2008, at 9:09 AM, Adrian Knoth wrote:
On Thu, Apr 24, 2008 at 08:25:44AM -0400, Alberto Giannetti wrote:
I am using one of the nodes as a desktop computer. Therefore it is
most important for me that the mpi program is not so greedily
acquiring cpu time.
From a performance/usability stand, you could set interactive
applications on higher priority to guarantee your desktop
applications work as expected.
What you really mean is to renice the MPI program to 10 or even 19.
Linux has also a Posix real-time scheduling mode (priocntl).
It's usually not a good idea to raise the priority of any program
below
0, as this could lock up your machine (that's why nice-levels below 0
are reserved for privileged users (root))
(note that lower nice levels actually mean higher priority. Just to
avoid confusion. I guess I don't have to mention "man nice" on a
technical mailing list.)
Anyway, I suggest you set mpi_yield_when_idle=1 in your mca-
params.conf.
--
Cluster and Metacomputing Working Group
Friedrich-Schiller-Universität Jena, Germany
private: http://adi.thur.de
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