[OMPI users] Why communication performance change with binding PEs?

Hi, I am trying to understand this peculiar behavior where the communication time in OpenMPI changes depending on the number of process elements (cores) the process is bound to. Is this expected? Thank you, saliya -- Saliya Ekanayake Ph.D. Candidate | Research Assistant School of Informatics a

Re: [OMPI users] Why communication performance change with binding PEs?

Can you please provide more details on your config, how test are performed and the results ? to be fair, you should only compare cases in which mpi tasks are bound to the same sockets. for example, if socket0 has core[0-7] and socket1 has core[8-15] it is fair to compare {task0,task1} bound

Re: [OMPI users] Shared Libraries

Wow, I haven’t encountered Forth in over 20 years! Though I confess I used to program in it myself back in my control days. IIRC, you would need to write a wrapper to let Forth access C-based functions, yes? You could configure and build OMPI as a 32-bit library, and libmpi.so is C, so that isn

[OMPI users] Fw: OpenSHMEM Runtime Error

From: "RYAN RAY"Sent: Wed, 22 Jun 2016 14:32:33To: "users"Subject: OpenSHMEM Runtime ErrorI have installed openmpi-1.10.1 in a system and while executing one of the example codes of OpenSHMEM I am getting an error. The snapshot of the error is attach

Re: [OMPI users] Fw: OpenSHMEM Runtime Error

Ryan -- Did you try the suggestions listed in the help message? > On Jun 23, 2016, at 1:24 AM, RYAN RAY wrote: > > > > From: "RYAN RAY" > Sent: Wed, 22 Jun 2016 14:32:33 > To: "users" > Subject: OpenSHMEM Runtime Error > > I have installed openmpi-1.10.1 in a system and while executing one

Re: [OMPI users] Shared Libraries

Greetings Richard. Yes, that certainly is unusual. :-) Here's my advice: - Configure Open MPI with the --disable-dlopen flag. This will slurp in all of Open MPI's plugins into the main library, and make things considerably simpler for you. - Build Open MPI in a 32 bit mode -- e.g., supply C

Re: [OMPI users] Why communication performance change with binding PEs?

Thank you, Gilles for the quick response. The code comes from a clustering application, bu let me try to explain simply what the pattern is. It's a bit long than I expected. The program has the pattern BSP pattern with *compute()* followed by collective *allreduce()* And it does many iterations

Re: [OMPI users] Why communication performance change with binding PEs?

Java uses *many* threads, simply ls /proc//tasks and you will be amazed at how many threads are used. Here is my guess, from the point of view of a given MPI process : in case 1, the main thread and all the other threads do time sharing, so basically, when an other thread is working, the mai

Re: [OMPI users] Why communication performance change with binding PEs?

Thank you, this is really helpful. Yes, the other bookkeeping threads of Java were what I worried too. I think I can extract a part to make a c program to check. I've got a quick question. Besides theses time sharing constraints, does number of cores has any significance to MPI's communication d

Re: [OMPI users] Why communication performance change with binding PEs?

On Jun 23, 2016, at 8:20 AM, Saliya Ekanayake wrote: > > I've got a quick question. Besides theses time sharing constraints, does > number of cores has any significance to MPI's communication decisions? Open MPI doesn't use the number of cores available to it in any calculations / algorithm se

Re: [OMPI users] Fw: OpenSHMEM Runtime Error

Ryan, Four suggestions are provided in the help output. Please try these. Josh On Thu, Jun 23, 2016 at 1:25 AM, Jeff Squyres (jsquyres) wrote: > Ryan -- > > Did you try the suggestions listed in the help message? > > > > On Jun 23, 2016, at 1:24 AM, RYAN RAY wrote: > > > > > > > > From: "RYAN

[OMPI users] [[INVALID], INVALID] ORTE_ERROR_LOG: Not found in file ess_env_module.c at line 367

Hello Everyone! I recently downloaded OpenFOAM and while attempting to use its parallel features (which use mpi) I recieve the following error: su2@su2-HP:~/OpenFOAM/su2-3.0.1/run/tutorials/incompressible/simpleFoam/motorBike_baseCase$ mpirun -np 4 simpleFoam -parallel [su2-HP:21015] [[INVALI

Re: [OMPI users] [[INVALID], INVALID] ORTE_ERROR_LOG: Not found in file ess_env_module.c at line 367

Looks like you are getting mixes of OMPI installations between the nodes - try ensuring that the PATH and LD_LIBRARY_PATH are correct on all the nodes > On Jun 23, 2016, at 11:48 AM, Blair Climenhaga > wrote: > > Hello Everyone! > > I recently downloaded OpenFOAM and while attempting to use i

Re: [OMPI users] [[INVALID], INVALID] ORTE_ERROR_LOG: Not found in file ess_env_module.c at line 367

Hi Ralph, Thank you for your reply. How would I check that the PATH and LD_LIBRARY_PATH are correct on all nodes? I have a feeling that this is a likely problem though as the computer I am using has had many iterations of MPI installed on it and likely in different locations. All the best, Bl

Re: [OMPI users] [[INVALID], INVALID] ORTE_ERROR_LOG: Not found in file ess_env_module.c at line 367

One easy solution: configure OMPI with —enable-orterun-prefix-by-default and it will ensure that all the launched daemons and procs have the right setting on the backend nodes. Or you can ssh to each node and print the relevant envars and see what they say. > On Jun 23, 2016, at 12:19 PM, Blai

[OMPI users] Fwd: Run MPI in Firewall Enviroment

I realize that OpenMPI wasn't made to run in a Firewall environment. I'd like to try to get it to run in said environment though. So what *exact* ports do I need to open to be able to run in a firewall environment? And how can I set MPI to run on said ports? Any help I would really appreciate. Th

Re: [OMPI users] Fwd: Run MPI in Firewall Enviroment

Both the runtime and TCP BTL components accept port range definitions. All you have to do is tell us what those are, and then set your firewall to leave those ports open. So the cmd line would look like: mpirun -mca oob_tcp_dynamic_ipv4_ports 12345-12350 -mca btl_tcp_port_min_v4 34561 -mca btl_