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Thread: MPI_Allreduce thread safe?

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hello there

here says operation thread safe, i'm not quite sure how interpret that.

since particular call doesn't accept "tag" parameter, think not thread safe; instance, if have 10 process 3 threads each , each thread calls mpi_allreduce...

can sure calls not mixed?

knows alternative collective operation thread safe?

seems we're expected have private communicator each group of threads.
http://www.mcs.anl.gov/research/proj..._comm_dup.html

should work now.


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