mpi Questions
1
What might cause a C, MPI program using a library called SUNDIALS/CVODE (a numerical ODE solver) running on a Gentoo Linux cluster to give me repeated Signal 15 received.?
Is that code being issue...
1
Solved
I have written a sample code below:
#include <stdio.h>
#include <mpi.h>
double x;
int main (int argc, char **argv) {
MPI_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORL...
2
Solved
I've few problems with an MPI program in C. I want to send two messages with MPI_Send from slaves to master (using MPI_Send, MPI_Irecv and MPI_Test), but only the first message works. After that, i...
3
Solved
When I'm trying to make CUDA 5.0 samples an error appears:
Makefile:79: * MPI not found, not building simpleMPI.. Stop.
I've tried to download and build the latest version of Open MPI refferin...
1
Solved
I'm adding together a load of array elements from each process:
double rho[1024];
//Some operation to calculate rho for each process;
MPI_Allreduce(rho,rho,1024,MPI_DOUBLE,MPI_SUM,MPI_COMM_WORLD);...
5
Solved
I am trying to pass a dynamic 2d array with bcast to all ranks.
I have the following code.
#include <stdlib.h>
#include <mpi.h>
int main(int argc, char **argv)
{
float **array;
int...
1
Solved
Is it possible to have one function to wrap both MPI_Init and MPI_Init_thread? The purpose of this is to have a cleaner API while maintaining backward compatibility. What happens to a call to MPI_I...
Werra asked 26/4, 2013 at 0:0
1
Solved
I have the following situation: I have written some short MPI testcodes in order to find out which combination of send and receive operations works best in my code.
The code works perfectly fine ...
1
Solved
Whats wrong with
for (level = 1; level <= log2((double)size); level++)
^
Seems like its from using log2() but whats wrong? I am using it with OpenMPI code actually, but commenting this line...
Suitable asked 15/4, 2013 at 0:58
2
I come across this term every now and then.
And now I really need a clear explanation as I wish to use some MPI routines that
are said not to be interrupt-safe.
Bejarano asked 30/6, 2011 at 13:43
1
Solved
I am going to do some parallel computing and I'm totally a beginner in this area. I will use MPI to do the parallel work, with Master-Slave model. I now have four machines and want one of them to b...
Jarrettjarrid asked 9/4, 2013 at 13:34
1
Solved
There is a simple program in c++ / mpi (mpich2), which sends an array of type double. If the size of the array more than 9000, then during the call MPI_Send my programm hangs. If array is smaller t...
Vibratory asked 5/4, 2013 at 12:25
3
Solved
Sometimes MPI is used to send low-entropy data in messages. So it can be useful to try to compress messages before sending it. I know that MPI can work on very fast networks (10 Gbit/s and more), b...
Othilia asked 1/6, 2012 at 12:8
5
Solved
I'm looking for a way to profile my openMPI program in C, i'm using openMPI 1.3 with Linux Ubuntu 9.10 and my programs are run under a Intel Duo T1600.
what I want in profile is cache-misses, mem...
Copestone asked 2/8, 2010 at 13:8
1
Solved
I implemented a peer-to-peer connection in MPI using MPI_Open_port and MPI_Comm_accept. I run a server and a client program using
rafael@server1:~$ mpirun server
rafael@server2:~$ mpirun client
...
1
I'm trying out Microsoft's implementation of MPI. I installed the CCP sdk from here:
http://www.microsoft.com/en-us/download/details.aspx?id=239
And then in my project settings I added the inclu...
Dwyer asked 21/10, 2012 at 19:17
1
Solved
I wonder if anyone can shed some light on the MPI_Waitall function for me. I have a program passing information using MPI_Isend and MPI_Irecv. After all the sends and receives are complete, one pro...
Rom asked 15/3, 2013 at 20:1
1
Recently working in parallel domain i come to know that there are two terms "vertical parallelism " and "horizontal parallelism". Some people says openmp ( shared memory parallelism ) as vertical w...
Theatrical asked 29/4, 2011 at 13:47
1
Solved
I am moving a program parallelized by OpenMP to Cluster. The cluster is using Lava 1.0 as scheduler and has 8 cores in each nodes. I used a MPI wrapper in the job script to do multi-host parallel.
...
Karyoplasm asked 2/3, 2013 at 17:33
2
I'm looking for some guidance with C# and parallel programming. I know that MPI .NET exists, and OpenMP is not supported.
My question then: is there some other library (TPL?) or feature that ...
Brut asked 26/1, 2012 at 21:24
1
I'm not sure how to use the physical IDs that I've retrieved from hwloc. For example, I see the following, but if I place rank 0=10.0.2.4 slot=1:8 in the rankfile I get an error that 8 does not exi...
Enticement asked 25/2, 2013 at 18:53
4
Solved
I am new to parallel computing world. Can you tell me is it possible to run a c++ code uses MPI routines in my laptop with dual core or is there any simulator/emulator for doing that?
Abreu asked 19/2, 2010 at 19:52
2
Solved
According to this website, the usage of MPI::COMM_WORLD.Send(...) is thread safe. However in my application I often (not always) run into deadlocks or get segmentation faults. Enclosing each call o...
Porush asked 12/2, 2013 at 16:1
1
I am trying to divide my processors into groups then add the summation of each group
independently ... but I couldn't find the result correctly until now.
a simple example is as follows:
int main...
2
Solved
This question is related to this question: MPI and D: Linker Options
I am trying to get MPI working from D. There are several posts to be found in the net, but none I found did actually work... So...
© 2022 - 2024 — McMap. All rights reserved.