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Questions tagged [openmpi]

Open MPI is an open source implementation of the Message Passing Interface, a library for distributed memory parallel programming.

The Open MPI Project is an open-source implementation of the Message Passing Interface, a standardized and portable message-passing system designed to leverage to computational power of massively parallel, distributed memory computers.

Message passing is one of the distributed memory models most often used, with MPI being the most used message passing API, offering two types of communication between processes: point-to-point or collective. MPI can run in distributed and shared memory architectures.

An application using MPI consists usually of multiple simultaneously running processes, normally on different CPUs, which are able to communicate with each other. Normally, this type of application is programmed using the SPMD model. Nevertheless, most MPI implementations also support the MPMD model.

More information about the MPI standard may be found on the official MPI Forum website, in the official documentation, and in the Open MPI documentation.

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Open MPI ranks are not in order

When i run an "Open MPI" program, it generally assigns ranks in random order I want to know is there a way to always assign ranks in order? So instead of this Hello, World. I am 2 of 3 Hello, World. I am 0 of 3 Hello, World. I am 1 of 3 can i…
Jovi DSilva
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MPI Send and Receive Multiple Times

I am trying to do some MPI parallel work. I am able to run this on any number of processors. The issue is that each processor will take one job, execute it and send it back then the program is done. I want to be able to send a processor another…
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Parallel MPI Implementation of Serial Code

I have this code which uses Euler's method to solve the simple ODE - dy/dt = 2y - 2t^2 - 3. The serial code takes random values for y_0 and computes the result. I want to use MPI to send each node its own y_0 value and collect the results. Do I…
diggers3
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Visual Studio C++ and OpenMPI in windows: missing files.h

I've just correctly installed Visual Studio Express C++ and OpenMPI. I've added the path to PATH variable: C:\Program Files\OpenMPI_v1.5.5-win32\bin; C:\Program Files\Microsoft Visual Studio 10.0\VC\bin; C:\Program Files\Microsoft Visual Studio…
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OpenMPI doesn't send data from an array

I am trying to parallelize a grayscale filter for BMP image, my function get stuck when trying to send data from a pixel array. #include #include #include #include #include "mpi.h" #define…
John Smith
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Open MPI's Java bindings

I'm trying to build the new Java bindings of Open MPI (v.openmpi-1.9a1r29661) on Macbook Pro running Mavericks (OSX 10.9). I have the JDK 7 installed: ^_^:examples demirelo $ java -version java version "1.7.0_45" Java(TM) SE Runtime Environment…
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Parallelizing a function in openMpi?

I have an algorithm parallelized in main() using C with openMPI; it works perfect but now I want to move the code over to an external function. void my_parallel_function(int v[], int size, int rank) { if(rank==0) { MPI_Send(&v[0], 5,…
John Smith
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Scanf and Printf in OpenMPI

i am using ANSI C and OpenMPI library. I have this code: if(myRank == 0) { printf("\n\tEnter bright: "); scanf("%d", &bright); } But when i run the program it first wait for key pressing (scanf) and then printf. I really don't know what is…
John Smith
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Error in Open MPI run configurations with eclipse kepler

I have created a simple Open MPI project from default list ("MPI Pi C Project") using eclipse-kepler and PTP tools 7 (both latest). The project builds without any errors, and if I click on run, the output is also shown. However, when I configure…
Osman Khalid
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OpenMPI fault tolerance

I have an assignment to implement simple fault-tolerance in an OpenMPI application. The problem we are having is that, despite setting the MPI error handling to MPI_ERRORS_RETURN, when one of our nodes is unplugged from the cluster we get the…
iondune
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MPI_Scatter taking foever to complete

I am working on parallel LU decomposition using MPI, where I send bunch of contiguous rows from original matrix and retrieve them later after some computation. Scatter and Gather was working fine but I messed up and stuck. I know its is some silly…
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How to pass parameters from input file to fortran 77 mpirun during run time?

I am an MPI and Fortran 77 noob. I have a fortran 77 code FKRPRO.f which I wanted to parallelize using OpenMPI. The code requires a lot of parameters which are fed into it during run time from a separate file. Compilation and running is something…
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fatal error in pmpi_gather

So I have a raytracer I'm writing which compiles just fine, but when I get to the MPI_Gather() function I get this error set. If I write to files the whole thing finishes fine, but then I can't run it on a distributed computing system. Fatal error…
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How to use shared global datasets in MPI?

I am an MPI beginner. I have a large array gmat of numbers (type double, dimensions 1x14000000) which is precomputed and stored in a binary file. It will use approximately 100 MB in memory (14000000 x8 bytes /1024 /1024). I want to write a MPI code…
Guddu
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OpenMPI v/s Mvapich2: MPI_Send without MPI_Recv

I am trying to test the effects of MPI_Send without MPI_Recv. I have the following program which I compile and run using openmpi-1.4.5 and mvapich2-1.9. I am aware that these implementations are for 2 different versions of the MPI standard, but I…
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