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
--
Eloi Gaudry
Senior Product Development Engineer
Free Field Technologies
Company Website: http://www.fft.be
Direct Phone Number: +32 10 495 147
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Eloi Gaudry
Senior Product Development Engineer
Free Field Technologies
Company Website: http://www.fft.be
Direct Phone Number: +32 10 495 147
