Issues/6436/v3.1 #6437
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Issues/6436/v3.1 #6437
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correctly handle the case in which iovec is full and the last accessed element of the datatype is the beginning of a loop Refs. open-mpi#6285 Thanks Axel Huebl for reporting this Signed-off-by: Gilles Gouaillardet <gilles@rist.or.jp> cherry-pick open-mpi#6295 into 3.1 Signed-off-by: George Bosilca <bosilca@icl.utk.edu>
The issue was a little complicated due to the internal stack used in the convertor. The main issue was that in the case where we run out of iov space to save the raw description of the data while hanbdling a repetition (loop), instead of saving the current position and bailing out directly we reading of the next predefined type element. It worked in most cases, except the one identified by the HDF5 test. However, the biggest issue here was the drop in performance for all ensuing calls to the convertor pack/unpack, as instead of handling contiguous loops as a whole (and minimizing the number of memory copies) we copied data description by data description. Signed-off-by: George Bosilca <bosilca@icl.utk.edu>
bwbarrett
approved these changes
Mar 1, 2019
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#6436 part 1