I am very new to MPI programming (like 3 days old). I am now dealing with MPI_ALLREDUCE and MPI_REDUCE. The code below takes a value n and the task of ...
I am very new to MPI programming (like two days old) and it is the first time I post a question on stack overflow. I am now dealing with MPI_ALLREDUCE ...
I am currently working on a big project involving repast_hpc and mpi. I wanted to implement a two dimensional shared (across processes) array, because ...
I have a heterogeneous cluster, containing either 14-core or 16-core CPUs (28 or 32 threads). I manage job submissions using Slurm. Some requirements: ...
I am wanting to write a script that would look like the following: I tried: But all cores are running all parts of the script ...
Is MPI_Init equivalent to MPI_Init_thread with desired = MPI_THREAD_SINGLE? PS. There are plenty of questions on MPI_Init vs MPI_Init_thread here (e. ...
I am trying to run the following example MPI code that launches 20 threads and keeps those threads busy for a while. However, when I check the CPU uti ...
What is the difference between collective and non-collective communications in MPI? I've tried to understand difference between MPI_File_read and MPI_ ...
What is the purpose of using MPI_Pack/MPI_Unpack? Is it better than working with mpi structure types or derived types? ...
There is a function which gives back return value by using pointer to output: MPI_Comm_rank(MPI_Comm comm, int *rank) There is a class which uses it ...
How can I perform the below MPI_Allgatherv operation using the MPI_IN_PLACE (I want to avoid make copies of large arrays, so inplace modification is p ...
I'm trying to learn MPI and am trying to develop a C++ program where I need to send a bunch of objects with arbitrary sized vectors. Let the class be ...
I was coding in MPI using C. I don't understand how the MPI_Send() works or if maybe &array[element] works. here array[]={1,2,3,4,5,6,7,8,9,10} ...
Say I have 4 MPI processes labelled: P0, P1, P2, P3. Each process potentially has packets to send to other processes, but may not. I.e. P0 needs to s ...
I am running a R script parallelized with pbdMPI in which 10 comm.ranks load 1 file each, then comm.rank 0 gathers all the files and is supposed to me ...
The title says it all. How can I measure the time taken by MPI non-blocking point to point communications? ...
I am using boost::mpi with boost::geometry and would like to broadcast a boost::geometry rtree index. The easy workaround is to build the index on eac ...
There has been a post regarding usage of MPI with Armadillo in C++: here My question is, wether Lapack and OpenBlas did implement MPI support? I coul ...
So my goal is to use mpi4py to send the right column of matrix A to another thread where it should be written in the left column of matrix B. So we st ...
I have written some mpi code that solves systems of equations using the conjugate gradient method. In this method matrix-vector multiplication takes u ...