Hi Gus,
I played with collectives a few months ago. Details are here
http://www.cse.scitech.ac.uk/disco/publications/WorkingNotes.ConnectX.pdf
That was in the context of 1.2.6
You can get available tuning options by doing
ompi_info -all -mca coll_tuned_use_dynamic_rules 1 | grep alltoall
and simil
Hi Sangamesh,
I'd look into making sure that the node you are using is not running
anything in parallel.
Make sure you allocate a whole node and it is clean from previous jobs.
Best,
INK
Hi Sangamesh,
As far as I can tell there should be no difference if you run CPMD on a
single node whether with or without ib. One easy thing that you could do is
to repeat your runs on the infiniband node(s) with and without infiniband
using --mca btl ^tcp and --mca btl ^openib respectively. But si
riele Fatigati
> Hi Igor,
> My message size is 4096kb and i have 4 procs per core.
> There isn't any difference using different algorithms..
>
> 2009/1/23 Igor Kozin :
> > what is your message size and the number of cores per node?
> > is there any difference using
what is your message size and the number of cores per node?
is there any difference using different algorithms?
2009/1/23 Gabriele Fatigati
> Hi Jeff,
> i would like to understand why, if i run over 512 procs or more, my
> code stops over mpi collective, also with little send buffer. All
> proce
