On Dec 15, 2010, at 9:10 PM, Ioannis Papadopoulos wrote:
> I agree that MPI_Test() has to do some progress, but as you can see I am only
> sending one message and I busy wait on it - since there is nothing else to do
> and no other incoming traffic, I would expect no difference among MPI_Test()
On 12/15/2010 07:39 PM, Jeff Squyres wrote:
On Nov 30, 2010, at 4:09 PM, Ioannis Papadopoulos wrote:
The overall time may be the same, however it is alarming (at least to me) that
if you call MPI_Test() too many times, the average time per MPI_Test() call
increases. After all, that is what I
On Nov 30, 2010, at 4:09 PM, Ioannis Papadopoulos wrote:
> The overall time may be the same, however it is alarming (at least to me)
> that if you call MPI_Test() too many times, the average time per MPI_Test()
> call increases. After all, that is what I am trying to measure, how much it
> cost
Eugene Loh wrote:
Ioannis Papadopoulos wrote:
Has anyone observed similar behaviour? Is it something that I'll have
to deal with it in my code or does it indeed qualify as an issue to
be looked into?
I would say this is NOT an issue that merits much attention. There
are too many potential
Ioannis Papadopoulos wrote:
Has anyone observed similar behaviour? Is it something that I'll have
to deal with it in my code or does it indeed qualify as an issue to be
looked into?
I would say this is NOT an issue that merits much attention. There are
too many potential performance anomali
Hi,
Has anyone observed similar behaviour? Is it something that I'll have to
deal with it in my code or does it indeed qualify as an issue to be
looked into?
Thanks
Yiannis Papadopoulos wrote:
It is a quad core machine (Intel Core2 Quad CPU Q9550 - 64bit).
OpenMPI is the one that comes with
It is a quad core machine (Intel Core2 Quad CPU Q9550 - 64bit).
OpenMPI is the one that comes with Fedora 13.
I tested it on a cluster of Intel Xeon (32bit) with Gigabit Ethernet
with OpenMPI 1.3.3, the results are:
// with no timeout
Total time: 1.00309 secs
Estimated calls: 1116537
MPI_Test cal
What kind of network did you do these tests on?
Were both processes on the same machine or different machines?
On Nov 10, 2010, at 12:29 AM, Yiannis Papadopoulos wrote:
> Hello,
>
> I am using OpenMPI 1.4.1. I have a small test case that calls
> MPI_Test() too many times. I see one or two rand
Hello,
I am using OpenMPI 1.4.1. I have a small test case that calls
MPI_Test() too many times. I see one or two random time spikes when
this happens. On the other hand, if I avoid calling MPI_Test() based
on a timeout, this problem disappears.
For example, with no timeout, the results I'm gettin
