On Apr 4, 2012, at 8:04 PM, Rohan Deshpande wrote:
> Yes they are on same subnet. ips for example - 192.168.1.1, 192.168.1.2,
> 192.168.1.3
This is generally considered a bad idea, not just for MPI, but for Linux in
general. Google around about this. One reason, for example, is that there i
Yes they are on same subnet. ips for example - 192.168.1.1, 192.168.1.2,
192.168.1.3
So what I need to modify here?
On Thu, Apr 5, 2012 at 7:59 AM, Jeffrey Squyres wrote:
> Run ifconfig on your nodes. Do you have multiple IP interfaces?
>
> If so, are they on the same IP subnet? (e.g., one
Run ifconfig on your nodes. Do you have multiple IP interfaces?
If so, are they on the same IP subnet? (e.g., one IP interface 192.168.1.x/24
and another on 192.168.1.y/24)
On Apr 4, 2012, at 7:55 PM, Rohan Deshpande wrote:
> Hi,
>
> I am not quite sure what does that mean. Can you please
Hi,
I am not quite sure what does that mean. Can you please explain more.
Thanks
On Wed, Apr 4, 2012 at 10:47 PM, Jeffrey Squyres wrote:
> Do you have multiple IP interfaces on a single machine on the same IP
> subnet, perchance?
>
> If so, don't do that. :-) Put each of your IP addresses in
Hi Edgar, thank you for the response.
Unfortunately, I've tried with and without this option. In both the result
was the same... =(
On Wed, Apr 4, 2012 at 5:04 PM, Edgar Gabriel wrote:
> did you try to start the program with the --mca coll ^inter switch that
> I mentioned? Collective dup for in
did you try to start the program with the --mca coll ^inter switch that
I mentioned? Collective dup for intercommunicators should work, its
probably again the bcast over a communicator of size 1 that is causing
the hang, and you could avoid it with the flag that I mentioned above.
Also, if you cou
Hi there.
I've made some tests related to the problem reported by Rodrigo. And I
think, I'd rather be wrong, that *collective calls like Create and Dup do
not work with Inter communicators. I've try this in the client group:*
*MPI::Intercomm tmp_inter_comm;*
*
*
*tmp_inter_comm = server_comm.Crea
OK Jeffrey thanks a lot, the answer was very helpful to me, at least I got to
know the complexity of this issue.
--- On Wed, 4/4/12, Jeffrey Squyres wrote:
From: Jeffrey Squyres
Subject: Re: [OMPI users] Need Performance estimation of MPI_Bcast
To: "Open MPI Users"
List-Post: users@lists.ope
Do you have multiple IP interfaces on a single machine on the same IP subnet,
perchance?
If so, don't do that. :-) Put each of your IP addresses in a different IP
subnet.
On Apr 3, 2012, at 10:30 PM, Rohan Deshpande wrote:
> Hi,
>
> I am running a MPI program using cluster and tcp communi
On Apr 4, 2012, at 9:56 AM, anas trad wrote:
> Thanks Jeffrey, I understand, can you please guide me to such paper that give
> more accurate estimation for the MPI_Bcast.
I can't cite any specific papers (collectives are not my focus area, and I left
academia several years ago); you'll need to
Thanks Jeffrey, I understand, can you please guide me to such paper that give
more accurate estimation for the MPI_Bcast.
--- On Wed, 4/4/12, Jeffrey Squyres wrote:
From: Jeffrey Squyres
Subject: Re: [OMPI users] Need Performance estimation of MPI_Bcast
To: "Open MPI Users"
List-Post: users@
It's a bit more complicated than that; there are many factors involved:
- how many peer MPI processes are involved in the broadcast
- how many of those peers are local (and will likely communicate via shared
memory, not a network device) and how many are remote
- what broadcast algorithm is used
Hi Toufik,
Could you please try the 1.5.5 installer?
http://www.open-mpi.org/software/ompi/v1.5/downloads/OpenMPI_v1.5.5-1_win32.exe
Please let me know if it works for you. Thanks.
Shiqing
On 2012-04-02 8:02 PM, toufik hadjazi wrote:
Hi Shiqing,
i haven't yet find a solution and for the reco
Hi
Envoyé ,
Thanks for the reply but I want to estimate the time of executing MPI_Bcast
function by mathmatics. I found that we can achieve this by using LogGP model
with this equation:
T = ceil(log2p) . (L + 2 · o + (n − 1) · G
but that does not give good accuracy for time evaluation.
--- On
You can use the intel mpi benchmark, or skampi. These two programs are designed
to evaluate Moi performance.
Envoyé de mon iPad
Le 2012-04-04 à 08:46, anas trad a écrit :
> Hi all,
>
> I need to know the time estimation of executing MPI_Bcast function on Neolith
> Cluster. Please, can anyone
Hi all,
I need to know the time estimation of executing MPI_Bcast function on Neolith
Cluster. Please, can anyone show me how to achieve that.
Thanks,Anas
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