On 10/05/2010 10:23 AM, Storm Zhang wrote:
Sorry, I should say one more thing about the 500 procs test. I tried
to run two 500 procs at the same time using SGE and it runs fast and
finishes at the same time as the single run. So I think OpenMPI can
handle them separately very well.
For the bind-to-core, I tried to run mpirun --help but not find the
bind-to-core info. I only see bynode or byslot options. Is it same as
bind-to-core? My mpirun shows version 1.3.3 but ompi_info shows 1.4.2.
No, -bynode/-byslot is for mapping not binding. I cannot explain the
different release versions of ompi_info and mpirun. Have you done a
which to see where each of them are located. Anyways, 1.3.3 does not
have any of the -bind-to-* options.
--td
Thanks a lot.
Linbao
On Mon, Oct 4, 2010 at 9:18 PM, Eugene Loh <eugene....@oracle.com
<mailto:eugene....@oracle.com>> wrote:
Storm Zhang wrote:
Here is what I meant: the results of 500 procs in fact shows
it with 272-304(<500) real cores, the program's running time
is good, which is almost five times 100 procs' time. So it can
be handled very well. Therefore I guess OpenMPI or Rocks OS
does make use of hyperthreading to do the job. But with 600
procs, the running time is more than double of that of 500
procs. I don't know why. This is my problem.
BTW, how to use -bind-to-core? I added it as mpirun's options.
It always gives me error " the executable 'bind-to-core' can't
be found. Isn't it like:
mpirun --mca btl_tcp_if_include eth0 -np 600 -bind-to-core
scatttest
Thanks for sending the mpirun run and error message. That helps.
It's not recognizing the --bind-to-core option. (Single hyphen,
as you had, should also be okay.) Skimming through the e-mail, it
looks like you are using OMPI 1.3.2 and 1.4.2. Did you try
--bind-to-core with both? If I remember my version numbers,
--bind-to-core will not be recognized with 1.3.2, but should be
with 1.4.2. Could it be that you only tried 1.3.2?
Another option is to try "mpirun --help". Make sure that it
reports --bind-to-core.
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