openmpi

I'm testing a simple MPI program on my desktop (Ubuntu LTS 16.04/ Intel® Core™ i3-6100U CPU @ 2.30GHz × 4/ gcc 4.8.5 /OpenMPI 3.0.0) and mpirun won't let me use all of the cores on my machine (4). When I run: $ mpirun -n 4 ./test2 I get the following error: -------------------------------------------------------------------------- There are not enough slots available in the system to satisfy the 4 slots that were requested by the application: ./test2 Either request fewer slots for your application, or make more slots available for use. ----------------------------------------------------------

Friends, I am trying to learn the openMP paradigm. I used the following code to understand the #omp for pragma. int main(void){ int tid; int i; omp_set_num_threads(5); #pragma omp parallel \ private(tid) { tid=omp_get_thread_num(); printf("tid=%d started ...\n", tid); fflush(stdout); #pragma omp for for(i=1; i<=20; i++){ printf("t%d - i%d \n", omp_get_thread_num(), i); fflush(stdout); } printf("tid=%d work done ...\n", tid); } return 0; } In the above code, there is an implicit barrier at the end of #pragma omp parallel, meaning all the threads 0,1,2,3,4 must reach there before going to the

I having some synchronization issues using the OpenMPI implementation of MPI_Barrier: int rank; int nprocs; int rc = MPI_Init(&argc, &argv); if(rc != MPI_SUCCESS) { fprintf(stderr, "Unable to set up MPI"); MPI_Abort(MPI_COMM_WORLD, rc); } MPI_Comm_size(MPI_COMM_WORLD, &nprocs); MPI_Comm_rank(MPI_COMM_WORLD, &rank); printf("P%d\n", rank); fflush(stdout); MPI_Barrier(MPI_COMM_WORLD); printf("P%d again\n", rank); MPI_Finalize(); for mpirun -n 2 ./a.out output should be: P0 P1 ... output is sometimes : P0 P0 again P1 P1 again what's going on? The order in which your print out lines appear on your

I have a set of computational operations that need to be performed a cluster (maybe like 512 MPI processes). Right now, I have the root node on the cluster open a socket and transfer data to my local computer in between the compute operations, but I'm wondering if it's possible to just create two MPI groups, and one of those groups is my local machine, and the other the remote cluster, and to send data between them using MPI commands. Is this possible? Hristo Iliev Yes, it is possible, as long as there is a network path between the cluster node and your machine. The MPI standard provides the

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have install openmpi library from the standard apt-get install available in Ubuntu. I run a python code which call MPI libraries. I get the following error. Any ideas whatis the source of error? Is it an OpenMPI configuration error? How to fix this? [thebigbang:17162] mca: base: component_find: unable to open /usr/lib/openmpi/lib/openmpi/mca_paffinity_hwloc: perhaps a missing symbol, or compiled for a different version of Open MPI? (ignored) [thebigbang:17162] mca: base: component_find: unable to open /usr/lib/openmpi/lib/openmpi/mca_carto