Hi Christian, do you have the ticket #, I just looked and didn't see it
listed...
G.
On Tue, 12 Sep 2006, Christian Siebert wrote:
Hi,
I stumbled across a serious bug in the tuned component of Open MPI,
which crashes for example the well-known HPL benchmark in conjunction
with the "native MPI_Bcast() patch" [1].
The problem is within the function ompi_coll_tuned_bcast_intra_chain(),
which does mainly the following:
ompi_ddt_type_size( datatype, &typelng );
segcount = segsize / typelng;
num_segments = count / segcount;
Whenever you have a constructed type with a size larger than 'segsize'
(16384), you'll get a 'seqcount' of zero and finally a division by zero.
Happy fixing!
Christian
[1] http://www-user.tu-chemnitz.de/~chsi/hpl/
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Thanks,
Graham.
----------------------------------------------------------------------
Dr Graham E. Fagg | Distributed, Parallel and Meta-Computing
Innovative Computing Lab. PVM3.4, HARNESS, FT-MPI, SNIPE & Open MPI
Computer Science Dept | Suite 203, 1122 Volunteer Blvd,
University of Tennessee | Knoxville, Tennessee, USA. TN 37996-3450
Email: f...@cs.utk.edu | Phone:+1(865)974-5790 | Fax:+1(865)974-8296
Broken complex systems are always derived from working simple systems
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