[OMPI users] random problems with a ring communication example

Hello, I followed a simple MPI example to do a ring communication. Here's the figure that illustrates this example with 7 processes : http://i.imgur.com/Wrd6acv.png Here the code :

Re: [OMPI users] random problems with a ring communication example

g of stdout. > > > On Mar 15, 2014, at 2:43 PM, christophe petit < > christophe.peti...@gmail.com> wrote: > > Hello, > > I followed a simple MPI example to do a ring communication. > > Here's the figure that illustrates this exa

[OMPI users] efficient strategy with temporary message copy

Hello, I am studying the optimization strategy when the number of communication functions in a code is high. My courses on MPI say two things for optimization which are contradictory : 1*) You have to use temporary message copy to allow non-blocking sending and uncouple the sending and

Re: [OMPI users] efficient strategy with temporary message copy

Thanks Jeff, I understand better the different cases and how to choose as a function of the situation 2014-03-17 16:31 GMT+01:00 Jeff Squyres (jsquyres) <jsquy...@cisco.com>: > On Mar 16, 2014, at 10:24 PM, christophe petit < > christophe.peti...@gmail.com> wrote: &

[OMPI users] try to understand heat equation 2D mpi version

Hello, i'm studying the parallelized version of a solving 2D heat equation code in order to understand cartesian topology and the famous "MPI_CART_SHIFT". Here's my problem at this part of the code :

[OMPI users] try to understand heat equation 2D mpi solving version

Hello, i am still trying to understand the parallelized version of the heat equation 2D solving that we saw at school. In order to explain my problem, i need to list the main code : 9 program heat 10 !** 11 ! 12 !

[OMPI users] Need Help for understand heat equation 2D mpi solving version

Hello, > > i am still trying to understand the parallelized version of the heat > equation 2D solving that we saw at school. In order to explain my problem, i > need to list the main code : > > 9 program heat > 10 >

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[OMPI users] need help for a mpi 2d heat equation solving code

Hello, i need help regarding a mpi program which solves the 2d heat equation. I have rewritten the original code in my own way, in oder to understand well the parallelization. I will initially make it work with 4 processors (nproc=4) with a 2D domain of 100 points, that is to say 10 on the x

[OMPI users] Problem on 3D contiguous array with MPI_TYPE_VECTOR

Hello, I try to use MPI for solving the Fourier equation in 3D. In the code, I have the following parameters : number of domains on Ox : x_domains number of domains on Oy : y_domains number of domains on Oz : z_domains size of grid on Ox: size_x size of grid on Oy: size_y size of grid on Oz:

[OMPI users] issue with 2 connected computers

Hello, I try to launch an executable on 2 computers ( Debian 6.0 and MacOS snow leopard ). I have successfully installed on both Open-MPI 1.6 with the option "--enable-heterogenous" and setup passwordless ssh connection between the 2 computers. My issue is that the distributed computing works

[OMPI users] MPIRUN Error on Mac pro i7 laptop and linux desktop

hello, i have a problem concerning the execution of a f90 program (explicitPar) compiled with openmpi-1.4.2. I get nearly the same error on my debian desktop ( AMD Phenom(tm) 9550 Quad-Core Processor) and my mac pro i7 laptop : on mac pro i7 : $ mpiexec -np 2 explicitPar

Re: [OMPI users] MPIRUN Error on Mac pro i7 laptop and linux desktop

> MPI_Cart_shift. "Invalid" probably means that it's not a Cartesian > communicator. > > You might want to double check the definition and requirements of the > MPI_CART_SHIFT function (see the MPI_Cart_shift(3) man page). > > > > On Jul 28, 2010, at 1

[OMPI users] MacOS - Running MPI code with 256 procs - “[warn] select: Invalid argument” message

Hello, Using Open-Mpi 3.0 and following the tutorial on this link , I try to run a MPI code under MacOS 10.9.5 (Mavericks) with a number of process equal to 256 : the MPI code allocates for each

Re: [OMPI users] MacOS - Running MPI code with 256 procs - “[warn] select: Invalid argument” message

How did you build/install Open MPI ? > The message seems to come from libevent, and Open MPI uses an embedded > version of libevent. > It is possible to use an external version at configure time. > If you are using an external libevent, you might want to try > rebuilding Open

Re: [OMPI users] MacOS - Running MPI code with 256 procs - “[warn] select: Invalid argument” message

bedded > version of libevent. > It is possible to use an external version at configure time. > If you are using an external libevent, you might want to try > rebuilding Open MPI with the embedded one. > > > Cheers, > > Gilles > > On Wed, Feb 14, 2018 at 4:5

Re: [OMPI users] MacOS - Running MPI code with 256 procs - “[warn] select: Invalid argument” message

not work, then could you give a try to Open MPI from > homebrew ? > > and if that fixes the issue, can you please post your configure command > line ? > > > Cheers, > > > Gilles > > > On 2/17/2018 7:08 AM, Christophe Petit wrote: > >> Hello Gilles,