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Subject: [OMPI devel] [PATCH]Incorrect algorithm choice using coll_tuned_dynamic_rules_filename (over 2GiB message)
From: Y.MATSUMOTO (yuki.matsumoto_at_[hidden])
Date: 2012-03-01 02:33:31

Dear All,

Next feedback is about "coll_tuned_dynamic_rules_filename".

Incorrect algorithm is selected in following conditions:
1:"--mca coll_tuned_use_dynamic_rules 1" is set.
2:"--mca coll_tuned_dynamic_rules_filename" is set.
3: Collective communication which is written in 2, called >= 2GiB communication.
(ex) MPI_Bcast:data type size * count >= 2GiB
MPI_Allgather: data type size * count * communication size >= 2GiB)

Please see attached patch(Patch is for V1.4.x).
But, we found problem when over 2GiB message is written in rulefile as "message size".
(over 2GiB message cannot read correctly.)
And we do not fix it.

Best Regards,
yuki Matsumoto
MPI development team,