On Jan 12, 2010, at 16:57 , Eugene Loh wrote:
> Jeff Squyres wrote:
>
>> It would be very strange for nanosleep to cause a problem for Open MPI -- it
>> shouldn't interfere with any of Open MPI's mechanisms. Double check that
>> your my_barrier() function is actually working properly -- remov
Jeff Squyres wrote:
It would be very strange for nanosleep to cause a problem for Open MPI -- it
shouldn't interfere with any of Open MPI's mechanisms. Double check that your
my_barrier() function is actually working properly -- removing the nanosleep()
shouldn't affect the correctness of yo
It would be very strange for nanosleep to cause a problem for Open MPI -- it
shouldn't interfere with any of Open MPI's mechanisms. Double check that your
my_barrier() function is actually working properly -- removing the nanosleep()
shouldn't affect the correctness of your barrier.
If you'v
First of all, the reason that I have created a CPU-friendly version of
MPI_Barrier is that my program is asymmetric (so some of the nodes can
easily have to wait for several hours) and that it is I/O bound. My program
uses MPI mainly to synchronize I/O and to share some counters between the
nodes,
On Sun, 2009-12-13 at 19:04 +0100, Gijsbert Wiesenekker wrote:
> The following routine gives a problem after some (not reproducible)
> time on Fedora Core 12. The routine is a CPU usage friendly version of
> MPI_Barrier.
There are some proposals for Non-blocking collectives before the MPI
forum cu
Let's start with this: You generate non-blocking sends (MPI_Isend).
Those sends are not completed anywhere. So, strictly speaking, they
don't need to be executed. In practice, even if they are executed, they
should be "completed" from the user program's point of view (MPI_Test,
MPI_Wait, MP
The following routine gives a problem after some (not reproducible) time on
Fedora Core 12. The routine is a CPU usage friendly version of MPI_Barrier.
The verbose output shows that if the problem occurs one of the (not
reproducible) nodes does not receive a message from one of the other (not
re
