Dear developers,
I "switched" from Lam-MPI to Open MPI recently. I am using MacOS X
server
on small clusters, previously with XLF/XLC on G5, now gfortran/gcc
with Intels.
Since users are used to Unix file systems, since most applications/
libraries compilations are not aware of HFS+ file s
OMPI uses the getcwd() library call to determine the pwd, whereas the
shell $PWD variable contains the shell's point of view of what the
PWD is (I *suspect* that the pwd(1) shell command also uses getcwd(),
but I don't know that for sure).
From the OSX getcwd(3) man page:
The getcwd()
On Mar 5, 2007, at 9:50 AM, Michael wrote:
I have discovered a problem with the Fortran90 interfaces for all
types of communication when one uses derived datatypes (I'm currently
using openmpi-1.3a1r13918 [for testing] and openmpi-1.1.2 [for
compatibility with an HPC system]), for example
call
Sorry for the delay in replying -- we've been quite busy trying to
get OMPI v1.2 out the door!
Are you sure that you build BLACS properly with Open MPI? Check this
FAQ item:
http://www.open-mpi.org/faq/?category=mpi-apps#blacs
In particular, note that there are items in Bmake.inc that
On Tue, 2007-03-06 at 09:51 -0500, Jeff Squyres wrote:
> On Mar 5, 2007, at 9:50 AM, Michael wrote:
>
> > I have discovered a problem with the Fortran90 interfaces for all
> > types of communication when one uses derived datatypes (I'm currently
> > using openmpi-1.3a1r13918 [for testing] and open
On Feb 19, 2007, at 1:53 PM, Mark Kosmowski wrote:
[snipped good description of cluster]
Sorry for the delay in replying -- traveling for a week-long OMPI
developer meeting and trying to get v1.2 out the door has sucked up
all of our time recently. :-(
For just the one system with two
On Mar 6, 2007, at 10:23 AM, Åke Sandgren wrote:
What about the "Fortran 2003 ISO_C_BINDING" couldn't a C_LOC be used
here?
(I probably don't know what i'm talking about but i just saw a
reference
to it.)
FWIW, we wrote a paper about a proposed Fortran 2003 bindings that
uses the ISO_C_BI
Sure, we can add a FAQ entry on that :).
At present, configure decides whether Open MPI will be installed on a
case sensitive file-system or not based on what the build file system
does. Which is far from perfect, but covers 99.9% of the cases. You
happen to be the .1%, but we do have an
Hi Tim, I get back to you
"What kind of system is it?"
=>The system is a "Debian Sarge".
"How many nodes are you running on?"
=> There is no cluster configured, so I guess I work with no node environnement.
"Have you been able to try a more recent version of Open MPI?"
=>Today, I tried with versio
I have a section of code were I need to send 8 separate integers via
BCAST.
Initially I was just putting the 8 integers into an array and then
sending that array.
I just tried using MPI_PACK on those 8 integers and I'm seeing a
massive slow down in the code, I have a lot of other communic
I doubt this come from the MPI_Pack/MPI_Unpack. The difference is 137
seconds for 5 calls. That's basically 27 seconds by call to MPI_Pack,
for packing 8 integers. I know the code and I'm affirmative there is
no way to spend 27 seconds over there.
Can you run your application using valgrind
Brian Barrett wrote:
specify --with-cs-fs or --without-cs-fs
Unbeliveable !
Thanks again.
--
Christian SIMON
I believe I know what is happening here. My availability in the next week is
pretty limited due to a family emergency, but I'll take a look when I get
back. In brief, this is a resource starvation issue where the system thinks
your node is unable to support any further processes and so it blocks.
I discovered I made a minor change that cost me dearly (I had thought
I had tested this single change but perhaps didn't track the timing
data closely).
MPI_Type_creat_struct performs well only when all the data is
continuous in memory (at least for OpenMPI 1.1.2).
Is this normal or expe
On Mar 6, 2007, at 4:51 PM, Michael wrote:
MPI_Type_creat_struct performs well only when all the data is
continuous in memory (at least for OpenMPI 1.1.2).
There are always benefits for sending contiguous data, especially
when the message is small. Packing and unpacking, are costly
opera
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