mpi Questions
3
Here is a simple MPI "Hello, World!" program.
#include <stdio.h>
#include <mpi.h>
int main(int argc, char **argv)
{
int size, rank;
MPI_Init(&argc, &argv);
MPI_Comm_size(MP...
2
I tried installing Intel MPI Benchmark on my computer and I got this error:
fork: retry: Resource temporarily unavailable
Then I received this error again when I ran ls and top command.
W...
1
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So far, my application is reading in a txt file with a list of integers. These integers needs to be stored in an array by the master process i.e. processor with rank 0. This is working fine.
Now,...
Gerardgerardo asked 13/12, 2012 at 20:20
7
With the recent buzz on multicore programming is anyone exploring the possibilities of using MPI ?
Sirreverence asked 29/9, 2008 at 7:12
2
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In general, is it possible for a parallel code to be slower than the serial code? mine is and I am really frustrated at it! what can I do?
Cookery asked 8/12, 2012 at 20:50
1
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I have 3 questions, all related to MPI (in C). I think the first 2 have the same answer, but I'm not positive.
Question 1
When using MPI_Dims_create to create a 2D grid, which dimension of the ...
2
I am trying to do some MPI, and here is a simple program using MPI_Send, MPI_Recv (yes, blocking). Rank 0 sends messages to all other processes and the others receive it. However, my MPI_Send never...
3
I have a code with heavy symbolic calculations (many multiple symbolic integrals). Also I have access to both an 8-core cpu computer (with 18 GB RAM) and a small 32 cpu cluster. I prefer to remain ...
Schlemiel asked 29/11, 2012 at 0:48
3
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I'm trying to install Rmpi package on a LAM MPI cluster machine. Previously I had been compiling and testing some stuff (mpi4py and small C++ programs) so I'm sure the MPI itself works. However ins...
Gorham asked 26/11, 2012 at 18:25
1
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I'm trying to make a parallel version of "Harmonic Progression Sum" problem using MPI and opemMP together. But the output are differents each other process.
Could someone help me to finish this p...
Lavenialaver asked 24/11, 2012 at 19:27
1
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I have a number of processes (of the order of 100 to 1000) and each of them has to send some data to some (say about 10) of the other processes. (Typically, but not necessary always, if A sends to ...
Markland asked 22/11, 2012 at 4:14
1
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I have a bit of research related question.
Currently I have finished implementation of structure skeleton frame work based on MPI (specifically using openmpi 6.3). the frame work is supposed to be...
Gapin asked 21/11, 2012 at 21:14
4
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I want to run a program with mpirun on different sets of machines (All linux machines with Open Mpi 1.5).
Right now I have machines where I can log on with username A, and another set of machines...
1
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It is clear that its arguments are:
int MPI_Type_create_subarray(
int ndims,
int array_of_sizes[],
int array_of_subsizes[],
int array_of_starts[],
int order,
MPI_Datatype oldtype,
MPI_Datat...
1
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I searched for my problem in Google and at this site but i still don't understand the solution.
I have piece of MPI program which RECV some data. Program crashes on big arrays with error of insuff...
1
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I have an int I intend to broadcast from root (rank==(FIELD=0)).
int winner
if (rank == FIELD) {
winner = something;
}
MPI_Barrier(MPI_COMM_WORLD);
MPI_Bcast(&winner, 1, MPI_INT, FIELD, MP...
2
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I have a machine with 8 processors. I want to alternate using OpenMP and MPI on my code like this:
OpenMP phase:
ranks 1-7 wait on a MPI_Barrier
rank 0 uses all 8 processors with OpenMP
MPI ph...
2
While dividing my application in various tasks and convert it for a multi thread environment, I have realized that fundamentally I've got the base concept wrong: OpenCL is not suited for the kind o...
2
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Debugging my program on big counts of kernels, I faced with very strange error of insufficient virtual memory. My investigations lead to peace of code, where master sends small messages to each sla...
Post asked 26/10, 2012 at 14:23
1
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I am learning to program in MPI and I came across this question. Lets say I have a .txt file with 100,000 rows/lines, how do I chunk them for processing by 4 processors? i.e. I want to let processo...
Nuclei asked 17/10, 2012 at 16:48
1
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I have a project which requires 'n' number of processes to work until the problem is solved. Each slave process executes the same code. When a certain condition arises, the process needs to notify ...
2
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How can my MPI program detect, if it was launched as a standalone application or via mpirun?
Sewer asked 1/10, 2012 at 17:49
1
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Generating Prime numbers is a toy problem that I often attempt from time to time, especially when experimenting with a new programming language, platform or style.
I was thinking of attempting to ...
Frear asked 24/9, 2012 at 6:18
1
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I have an application that stores a vector of structs. These structs hold information about each GPU on a system like memory and giga-flop/s. There are a different number of GPUs on each system.
...
2
I want to use multi-processes in a function and how can I make it.
As you know, MPI_Init needs two parameter: "int argc, char **argv". Does it mean that I must add these two parameters in the func...
Pricefixing asked 28/7, 2012 at 12:3
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