[mpiwg-tools] Vector MPI_T reads

Schulz, Martin schulzm at llnl.gov
Wed Dec 4 00:05:23 CST 2013

I think this could be interesting and helpful, but wouldn't this be expensive in the implementation, at least for some variables? Would we need some way to say which variables can be read atomically?


On Dec 3, 2013, at 2:27 PM, "Jeff Squyres (jsquyres)" <jsquyres at cisco.com>

> I'm trolling through SC-accumulated emails and saw one that prompted me to ask here (I think I asked about this before, but don't remember): is there any interest in atomic vector reads of MPI_T variables?
> I ask because, especially for pvars, if you loop over reading a bunch of them, they're not atomic, and you might not get consistent values.  But if you can issue a single MPI_T read for N values all at once, you have a much better chance of getting an atomic/consistent set of values.
> -- 
> Jeff Squyres
> jsquyres at cisco.com
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Martin Schulz, schulzm at llnl.gov, http://people.llnl.gov/schulzm
CASC @ Lawrence Livermore National Laboratory, Livermore, USA

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