what i cannot understand is the reason why this extra memory would be
initialized on proc 0 only.
as far as i know, this doesn't make sense.
éloi
On 22/04/2011 08:52, Eloi Gaudry wrote:
it varies with the receive_queues specification *and* with the number
of mpi processes: memory_consumed = nb_mpi_process * nb_buffers *
(buffer_size + low_buffer_count_watermark + credit_window_size )
éloi
On 04/22/2011 12:26 AM, Jeff Squyres wrote:
Does it vary exactly according to your receive_queues specification?
On Apr 19, 2011, at 9:03 AM, Eloi Gaudry wrote:
hello,
i would like to get your input on this:
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 resident memory consumption (2GB:
65336*256*128) on the process with rank 0 (and only this process)
just after a call to MPI_Init.
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.
thanks for your help,
éloi
