In this post, we will see how to resolve Why would this C++ container within a container fail to fill with new values using MPI_Recv? Question: I’ve implemented a working MPI send/recv, but I want to better organize and improve ...
In this post, we will see how to resolve Batch script not loading modules correctly Question: I have a really weird error that I’m completely stumped on and hoping for some help. I’m trying to submit a job via qsub ...
In this post, we will see how to resolve Script in mpi4py not executing correctly Question: I’m developing a cluster using mpi4py and when i run a basic script to test the cluster the result is weird: the result should ...
In this post, we will see how to resolve How to execute mpirun or mpiexec command from a python script? Question: I have an MPI application written in C++. When I run the application using mpirun or mpiexec on my ...
Question: Let’s say I have an array of non-blocking MPI requests initiated in a series of calls to MPI_ISEND (or MPI_IRECV). I store the request info in the array xfer_rqst. It is my understanding that when a request completes, its ...
Question: I’m trying to use MPI_Type_vector to swap data in the columns of two matrices. Here’s my code: When I cout everything in the first 10 elements of data for both processes (I’m running with 2 processes), It just says ...
Question: I’m facing a strange problem when trying to use MPI on a cluster, which uses Slurm as a job scheduler. On both cases, I’m trying to run this simple python program: Creating a batch script (where I export the ...
Question: I’ve troubles using the method .size() of std::vector when data are sent/received through the MPI interface. I created a custom type named point And the process 0 is supposed to send to process 1 and 2 a certain std::vector ...
Question: MPE is very useful for visualizing MPI programs, but it only provides compiler wrappers for C and Fortran: mpecc and mpef77, respectively. How can I use it if my MPI project is written in C++ and is normally compiled ...
Question: A common usage of MPI_Probe is in determining the size of an incoming message so that enough memory is allocated for the receive buffer. But this can also be done with a separate pair of MPI_Send-MPI_Recv calls, i.e. the ...