hi,
i'd like to know if someone had a chance to check at the issue I reported.
thanks and happy new year !
éloi
On 12/21/2010 10:58 AM, Eloi Gaudry wrote:
hi,
when launching a parallel computation on 128 nodes using openib and
the "-mca btl_openib_receive_queues P,65536,256,192,128" option, i
observe a rather large memory consumption (2GB: 65336*256*128) on the
process with rank 0 (only).
this memory seems to be initialized and in use as the resident memory
indicator matches the virtual one. at the time of observation, a call
to MPI_Init has been done, but no communication (user side) has been
done.
i'd like to know why the other processes doesn't behave the same:
- other processes located on the same nodes don't use that amount of
memory
- all others processes (i.e. located on any other nodes) neither
i'm using OpenMPI-1.4.2, built with gcc-4.3.4 and
'--enable-cxx-exceptions --with-pic --with-threads=posix' options. the
cluster is based on eight-core nodes using mellanox hca.
thanks for your help,
éloi
--
Eloi Gaudry
Senior Product Development Engineer
Free Field Technologies
Company Website: http://www.fft.be
Direct Phone Number: +32 10 495 147
