Hi Lars
I wonder if you could always use blocking message passing on the
preliminary send/receive pair that transmits the message size/header,
then use non-blocking mode for the actual message.
If the "message size/header" part transmits a small buffer,
the preliminary send/recv pair will use t
Hi,
I'm trying to solve a problem of passing serializable, arbitrarily
sized objects around using MPI and non-blocking communication. The
problem I'm facing is what to do at the receiving end when expecting
an object of unknown size, but at the same time not block on waiting
for it.
When using bl
Simon, it is a lot more difficult than it appears. You're right,
select/poll can do it for any file descriptor, and shared mutexes/
conditions (despite the performance impact) can do it for shared
memory. However, in the case where you have to support both
simultaneously, what is the right a
Dear Reiner, Jeff, Gus and list,
Thanks for your suggestions, I will test them tomorrow.
I did not check your mails before because I was busy trying the
gcc/gfortran way.
I have other problems:
- for static linking I am missing plenty of ibv_* routines. I saw on the
net that they should be in a l
Hi Michel, Jeff, Rainer, list
I have AMD Opteron Shanghai, and Intel 10.1017.
I had trouble with the Intel -fast flag also.
According to the ifort man page/help:
-fast = -xT -O3 -ipo -no-prec-div -static
(Each compiler vendor has a different -fast, PGI is another thing.)
Intel doesn't allow SS
The changes Jeff mentioned are not in the 1.3 branch - not sure if they will
come over there or not.
I'm a little concerned in this thread that someone is reporting the process
affinity binding changing - that shouldn't be happening, and my guess is
that something outside of our control may be cha
Rainer and I are still iterating on the trunk solution (we moved to an
hg branch just for convenience for the moment).
Note that the Fortran flags aren't too important to OMPI. We *only*
use them in configure. OMPI doesn't contain any Fortran 77 code at
all, and the F90 module is extremel
On Jun 3, 2009, at 11:40 AM, Ashley Pittman wrote:
Wasn't there a discussion about this recently on the list, OMPI binds
during MPI_Init() so it's possible for memory to be allocated on the
wrong quad, the discussion was about moving the binding to the orte
process as I recall?
Yes. It's bee
Jeff Squyres wrote:
We get this question so much that I really need to add it to the FAQ. :-\
Open MPI currently always spins for completion for exactly the reason
that Scott cites: lower latency.
Arguably, when using TCP, we could probably get a bit better performance
by blocking and allow
On Wed, 2009-06-03 at 11:27 -0400, Jeff Squyres wrote:
> On Jun 3, 2009, at 10:48 AM, wrote:
>
> > For HPL, try writing a bash script that pins processes to their
> > local memory controllers using numactl before kicking off HPL. This
> > is particularly helpful when spawning more than 1 thr
Dear Michel,
per the naming convention test in configure:
ifort -fast
will turn on -xHOST -O3 -ipo -no-prec-div -static,
of which -ipo turns on interprocedural optimizations for multiple files.
Here the compiled object file does not contain the symbols searched for in the
configure-tests.
Loo
Hi Jeff,
Yes, this technique is particularly helpful for multi-threaded and works
consistently across the various MPIs I test.
Thanks, jacob
> -Original Message-
> From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] On
> Behalf Of Jeff Squyres
> Sent: Wednesday, June 0
On Jun 3, 2009, at 10:48 AM, wrote:
For HPL, try writing a bash script that pins processes to their
local memory controllers using numactl before kicking off HPL. This
is particularly helpful when spawning more than 1 thread per
process. The last line of your script should look like "num
I'm afraid I have no experience with Hypre -- sorry! :-(
Do they have a support web site / mailing list somewhere? You might
have better luck contacting them about their software.
On Jun 3, 2009, at 11:05 AM, naveed wrote:
Hi,
I wanted to know if any have used Hypre library for the solut
tsi...@coas.oregonstate.edu wrote:
Thanks for the explanation. I am using GigEth + Open MPI and the
buffered MPI_BSend. I had already noticed that top behaved
differently on another cluster with Infinibandb + MPICH.
So the only option to find out how much time each process is waiting
arou
Hi,
I wanted to know if any have used Hypre library for the solution of Ax = b
for of equations.
I have problems reading in matrix file. I went through user manual, but
couldn't get much out of it. I wanted to know what will be the best file
format for reading large sparse matrices with Hypre.
Look
Hi Iftikhar,
For HPL, try writing a bash script that pins processes to their local memory
controllers using numactl before kicking off HPL. This is particularly helpful
when spawning more than 1 thread per process. The last line of your script
should look like "numactl -c $cpu_bind -m $ mem_b
Thanks for the explanation. I am using GigEth + Open MPI and the
buffered MPI_BSend. I had already noticed that top behaved differently
on another cluster with Infinibandb + MPICH.
So the only option to find out how much time each process is waiting
around seems to be to profile the code.
Ralph Castain a écrit :
> I assume you re-did the ./configure command?
Thanks for your answer.
Yes.
> Did you also remember to "make clean" before doing your "make all
> install"?
No, but now that I have done it, the result is the same: "ld: attempted
static link of dynamic object `../../../opal/.l
I assume you re-did the ./configure command? Did you also remember to "make
clean" before doing your "make all install"?
Also, I note that your prefix looks really strange - it looks like you are
trying to install OMPI where the Intel compiler is located? Are you sure you
want to do that?
On Wed
We get this question so much that I really need to add it to the
FAQ. :-\
Open MPI currently always spins for completion for exactly the reason
that Scott cites: lower latency.
Arguably, when using TCP, we could probably get a bit better
performance by blocking and allowing the kernel to
Hi again,
In fact I forgot to put back to '-fast -C' the FCFLAGS variable (from
'-O3 -C'). There is still an error (many opal_*_* subroutines not found
during the ipo step) at the same place, coming from the fact that
"ld: attempted static link of dynamic object
`../../../opal/.libs/libopen-pal.so
Dear openMPI users and developers,
I have just tried installing openmpi by compiling it rather than just
using a rpm because I want to use it with the ifort compiler.
I have noticed a problem in the configure script (present at least in
version 1.3.1 and 1.3.2) for the determination of Fortran na
On Jun 3, 2009, at 6:05 AM, tsi...@coas.oregonstate.edu wrote:
Top always shows all the paralell processes at 100% in the %CPU
field, although some of the time these must be waiting for a
communication to complete. How can I see actual processing as
opposed to waiting at a barrier?
Thanks
Top always shows all the paralell processes at 100% in the %CPU field,
although some of the time these must be waiting for a communication to
complete. How can I see actual processing as opposed to waiting at a
barrier?
Thanks,
Tiago
I'm afraid there is no way to do this in 1.3.2 (or any OMPI
distributed release) with MPI applications.
The OMPI trunk does provide continuous re-spawn of failed processes,
mapping them to other nodes and considering fault relationships
between nodes, but this only works if they are -not- M
Hi,
I am writing a program for a central controller that will spawn processes
depend on the user selection. And when there is some fault in the spawn
processes like for example, the computer that is spawned with the process
suddenly go down, the controller should react to this and respawn the
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