Re: [OMPI users] single CPU vs four CPU result differences, is it normal?

Dear Diego, I will suggest you read the following two. It will give you some good understanding as to what is happening: https://en.wikipedia.org/wiki/Butterfly_effect http://www.amazon.com/The-End-Error-Computing-Computational/dp/1482239868 --Bibrak On Wed, Oct 28, 2015 at 6:58 PM, Diego Ave

[OMPI users] How to run Open MPI over TCP (Ethernet)

Hi, I am facing problem in running Open MPI using TCP (on 1G Ethernet). In practice the bandwidth must not exceed 1000 Mbps but for some data points (for point-to-point ping pong) it exceeds this limit. I checked with MPICH it works as desired. Following is the command I issue to run my program o

Re: [OMPI users] How to run Open MPI over TCP (Ethernet)

overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:21661017 (20.6 MiB) TX bytes:21661017 (20.6 MiB) Bibrak Qamar On Thu, May 22, 2014 at 3:30 PM, Jeff Squyres (jsquyres) wrote: > Can you send the output of ifconfig on both compute-0-15.local and > compute-0-16

Re: [OMPI users] How to run Open MPI over TCP (Ethernet)

Dear Jeff, Thanks for the information and helping me out. I too delayed replying, I wanted to test this but the cluster here is down. I will check it and let you know in case it doesn't work. Thanks Bibrak Qamar On Sat, May 24, 2014 at 5:23 AM, Jeff Squyres (jsquyres) wrote: > I

[OMPI users] Calculate time spent on non blocking communication?

Hello All, I am using non-blocking send and receive, and i want to calculate the time it took for the communication. Is there any method or a way to do this using openmpi. Thanks Bibrak Qamar Undergraduate Student BIT-9 Member Center for High Performance Scientific Computing NUST-School of

[OMPI users] Check whether non-blocking communication has finished?

Hello All, Is there any way to find whether a non blocking communication has finished without calling the wait( ) function. Thanks Bibrak Qamar Undergraduate Student BIT-9 Member Center for High Performance Scientific Computing NUST-School of Electrical Engineering and Computer Science.

Re: [OMPI users] Calculate time spent on non blocking communication?

Gus Correa, But it will include the time of computation which took place before waitAll( ). List-Post: users@lists.open-mpi.org Date: Tue, 1 Feb 2011 10:09:03 +0400 From: Bibrak Qamar Subject: [OMPI users] Calculate time spent on non blocking communication? To: us...@open-mpi.org Message

Re: [OMPI users] Calculate time spent on non blocking communication?

Thanks all, As asked the reason of such calculation of non blocking communication, the main reason is that I want to look into the program as how much it percent time is consumed on communication alone, computation alone and the intersection of both. Bibrak Qamar Undergraduate Student BIT-9

[OMPI users] Collective comminucation API

I want to know, if there is any other implementation of collective communication ( reduce and Bcast) available apart from what openMPI provides. Thanks Bibrak Qamar Undergraduate Student BIT-9 Member Center for High Performance Scientific Computing NUST-School of Electrical Engineering and

[OMPI users] MPICH2 is working OpenMPI Not

rror message *** Because of the warning:regcache incompatible with malloc warning I did > bibrak@barq:~/XXX> export MX_RCACHE=2 And now ignored the warning, but the error still remains I shall appreciate any help. Bibrak Qamar NUST-SEECS