On Tue, 12 Aug 2008, Gus Correa wrote:
> Hello Daniel and list
>
> Could it be a problem with memory bandwidth / contention in multi-core?
Yes, I believe we are somehow limited by memory performance. Here are
some numbers from a dual Opteron 2352 system, which has much more memory
bandwidth:
Hi Rayne
SSH is used to start processes on the other machines - that's why you
must configure ssh to work without passwords.
As to your 64/32 bit problem: a program compiled for 32 bits usually
works on a 64 bit machine,
but not vice versa. There are methods to start MPI such that different
execu
Hi,
check in /usr/lib it's usually folder for 32bit libraries.
I think OFED1.3 comes already with Open MPI so it should be installed by
default.
BTW, OFED1.3.1 comes with Open MPI 1.2.6 .
Lenny.
On 8/12/08, Mohd Radzi Nurul Azri wrote:
>
> Hi,
>
>
> Thanks for the prompt reply. This might b
Hi,
just for the try - can run np 2
( Ping Pong test is for 2 processes only )
On 8/13/08, Daniël Mantione wrote:
>
>
>
> On Tue, 12 Aug 2008, Gus Correa wrote:
>
> > Hello Daniel and list
> >
> > Could it be a problem with memory bandwidth / contention in multi-core?
>
>
> Yes, I believe we ar
Hi,
I'm starting to think that the main problem lies in the 32-bit server not being
able to execute the program compiled by the 64-bit PC, and vice versa. I just
noticed that the sizes of the executables created by the PC and server are
different - the one created by the 64-bit PC is 3204 bytes
Usually OFED installs only 64 bit version of libibverbs. If you want to
install 32bit and 64bit version you need pass "--build32" flag to OFED
install. So after reinstalling OFED with 32bit support, you may rebuild
the OMPI for 32 bit support.
Regards,
Pasha
Mohd Radzi Nurul Azri wrote:
Hi
An application compiled for 64-bit *IS* different from a 32-bit.
But if both your 64-bit server and and 32-bit PC have compatible
processor types,
you can compile on the PC and run the program on the server.
(as i told you in my previous mail)
Jody
On Wed, Aug 13, 2008 at 10:15 AM, Rayne wrote:
FWIW, we have made some improvements to shared memory performance in
the upcoming v1.3 series. I won't ask you to test a v1.3 tarball
right now because there's a gnarly bug in the shared memory support
that George is working to fix -- hopefully he'll fix it soon and you
can see if the perf
Hi,
A bit more info wrt the question below. I have run other releases of OpenMPI
and they seem to be fine. The reason I need to run the latest is because it
supports valgrind fully.
openmpi-1.2.4
openmpi-1.3ar18303
TIA, Tom
--- On Tue, 8/12/08, Tom Riddle wrote:
Hi,
I am getting a curious
> [...]
>
> MPICH2 manages to get about 5GB/s in shared memory performance on the
> Xeon 5420 system.
Does the sm btl use a memcpy with non-temporal stores like MPICH2?
This can be a big win for bandwidth benchmarks that don't actually
touch their receive buffers at all...
-Ron
Hello,
I seem to have encountered a bug in MPI-IO, in which
MPI_File_get_position_shared hangs when called by multiple processes in
a communicator. It can be illustrated by the following simple test case,
in which a file is simply created with C IO, and opened with MPI-IO.
(defining or undefining
Hi,
Yup some OFED build need the 32 bit flag. The earlier issue I had is OFED
1.3 can't install properly with --build32 option. If it worked, then openmpi
1.2.5 32 bit woulr be installed as well. It's a chicken and egg thing.
However now what I've done is to re-install OFED 1.3.1 plus the 32 bit
Hi,
I tried to see if I can get my 64-bit PC to execute 64.out, and my 32-bit
server to execute 32.out, by using
mpirun --bynode -np 1 64.out : -np 1 32.out
My hostfile contains:
localhost
IP address of server
However, I got the following error message:
"Failed to find the following executab
I just tried to explicitly specify where 32.out is on the server when using
mpirun, and it worked. So the problem I had earlier did lie in the server not
being able to find 32.out. So what should I do so that I don't have to
explicitly specify the location of the program everytime I run mpirun?
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