Open MPI logo

Open MPI Development Mailing List Archives

  |   Home   |   Support   |   FAQ   |  

This web mail archive is frozen.

This page is part of a frozen web archive of this mailing list.

You can still navigate around this archive, but know that no new mails have been added to it since July of 2016.

Click here to be taken to the new web archives of this list; it includes all the mails that are in this frozen archive plus all new mails that have been sent to the list since it was migrated to the new archives.

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,
Fujitsu