Hi, Anyone have a feeling of whether a collective write or individual writes would be faster in the following scenario: file etc. opened collectively for MPI-I/O, being written to a lustreFS. 2%-10% of the MPI ranks need to write hyperslabs to the dset. Typical number of MPI ranks is ~2000. From googling around i get the sense that collective IO is usually faster because it's coordinated, but given the low % of MPI ranks needing to write to the data set should I go with individual dset writes? (The two approaches are outlined here: http://www.hdfgroup.org/hdf5-quest.html#par-nodata)
Thanks, Izaak Beekman =================================== (301)244-9367 UMD-CP Visiting Graduate Student Aerospace Engineering [email protected] [email protected] _______________________________________________ Hdf-forum is for HDF software users discussion. [email protected] http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
