Hi, Rob Latham <[email protected]> writes: >>>> is anyone aware of troubles with PHDF5 and IntelMPI? A test code to >>>> reads an HDF5 file in parallel has trouble when scaling if I run it with >>>> IntelMPI, but no trouble if I run it, for example, with POE.
>> thanks, but this issue is not happening in CURIE, but in MareNostrum, >> which uses GPFS. >> > > Good to know. While intel mpi does not include any GPFS optimizations, > there's > really only one optimization that matters for GPFS writes: aligning ROMIO file > domains to file system block boundaries. > > Set the MPI-IO hint "striping_unit" to the GPFS block size. But this problem is happening when reading a file, not writing it (in any case, I have tried setting the striping_unit as well, but no difference). So far I have no idea what is going on. ~1500 procs is where the trouble begins, but the number of processors that breaks the program is not fixed. I run it sucessfully with 1515 processors, then it failed with 1480... Any pointers appreciated, -- Ángel de Vicente http://www.iac.es/galeria/angelv/ --------------------------------------------------------------------------------------------- ADVERTENCIA: Sobre la privacidad y cumplimiento de la Ley de Protecci�n de Datos, acceda a http://www.iac.es/disclaimer.php WARNING: For more information on privacy and fulfilment of the Law concerning the Protection of Data, consult http://www.iac.es/disclaimer.php?lang=en
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