hkaiser changed the topic of #ste||ar to: STE||AR: Systems Technology, Emergent Parallelism, and Algorithm Research | stellar-group.org | HPX: A cure for performance impaired parallel applications | github.com/STEllAR-GROUP/hpx | This channel is logged: irclog.cct.lsu.edu
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<HHN93> How do we find the number of cores to ideally launch the par algorithm?
<HHN93> is their any API the OS provides for it?
<hkaiser> HHN93: you can control the number of cores, but there is no perfect mechanism to automatically select it
<HHN93> by default HPX chooses the number of physical cores, right?
<HHN93> how does it find out the number of physical cores?
<hkaiser> a) it looks at the hardware topology, and b) there is the --hpx:threads=N command line option that limits the number of cores used
<HHN93> `a) it looks at the hardware topology`
<HHN93> can you please briefly explain how this is done? or point me to the code which does it?
<hkaiser> sure
<hkaiser> it uses the hwloc library (https://www.open-mpi.org/projects/hwloc/)
<hkaiser> also, for the parallel algorithms, here are the beginnings of some docs describing how to customize parallel algorithms: https://github.com/STEllAR-GROUP/hpx/blob/416a7f8b0ed5b3dce4ed6096334919e0d494ae54/docs/sphinx/manual/migration_guide.rst
<HHN93> thank you
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