Re: [OMPI users] MPI over tcp

On Thu, 03 May 2012, Rolf vandeVaart wrote: > I tried your program on a single node and it worked fine. It works fine on a single node, but deadlocks when it communicates in between nodes. Single node communication doesn't use tcp by default. > Yes, TCP message passing in Open MPI has been

Re: [OMPI users] MPI over tcp

I tried your program on a single node and it worked fine. Yes, TCP message passing in Open MPI has been working well for some time. I have a few suggestions. 1. Can you run something like hostname successfully (mpirun -np 10 -hostfile yourhostfile hostname) 2. If that works, then you can also

[OMPI users] MPI over tcp

I'm attempting to use MPI over tcp; the attached (rather trivial) code gets stuck in MPI_Send. Looking at TCP dumps indicates that the TCP connection is made successfully to the right port, but the actual data doesn't appear to be sent. I'm beginning to suspect that there's some basic problem

Re: [OMPI users] Regarding the execution time calculation

Not related to this question , but just curious, is Wtime context switch safe ? -- Sent from my iPhone On May 3, 2012, at 4:48 AM, seshendra seshu wrote: > Hi, > I have written an parallel program and when i run my program on 4,8,16 nodes > and calculated the execution

Re: [OMPI users] Openmpi problem

You apparently are running on a cluster that uses Torque, yes? If so, it won't use ssh to do the launch - it uses Torque to do it, so the passwordless ssh setup is irrelevant. Did you ensure that your LD_LIBRARY_PATH includes the OMPI install lib location? On May 3, 2012, at 9:59 AM, Acero

[OMPI users] Openmpi problem

Hello, I have a problem when running a mpi program with openmpi library. I did the following. 1.- I installed the ofed 1.5.4 from RHEL. The hardware are qlogic 7340 ib cards. 2.- I am using openmpi 1.4.3 , the one that comes with ofed 1.5.4 3.- I have check openmpi website, and I have

Re: [OMPI users] OpenMPI and CUDA on cluster

I have solved this issue. All the paths were correct but I still had to use mpirun -x LD_LIBRARY_PATH while executing the job. Other option is to update your .bashrc/.cshrc. Just add the LD_LIBRARY_PATH to the file and the update variable will be available on remote machines as well. (I

Re: [OMPI users] Segmentation fault on master task

At 12:51 03/05/2012, you wrote: Thanks for the reply. When I modify the code it still fails with segmentation error. You run it on different servers or runs in the same server? If you are testing on one server, perhaps your gpu is out of memory. Check your cudaMalloc calls, perhaps memory

Re: [OMPI users] Regarding the execution time calculation

Hi, could you also attach your current code ? Regards Björn From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] On Behalf Of seshendra seshu Sent: den 3 maj 2012 13:49 To: Open MPI Users Subject: [OMPI users] Regarding the execution time calculation Hi, I have written

[OMPI users] Regarding the execution time calculation

Hi, I have written an parallel program and when i run my program on 4,8,16 nodes and calculated the execution time at master using MPI_Wtime in master node. The problem the execution time is increasing rapidly like NON parallel program-55 sec, and for parallel program 2-nodes--60sec , 4-nodes

Re: [OMPI users] Segmentation fault on master task

Thanks for the reply. When I modify the code it still fails with segmentation error. my latest code looks like #include "mpi.h" #include #include #include #include #include #include #define MASTER0 #define ARRAYSIZE 4000 int