openmpi

问题 Following my previous question : Unable to implement MPI_Intercomm_create The problem of MPI_INTERCOMM_CREATE has been solved. But when I try to implement a basic send receive operations between process 0 of color 0 (globally rank = 0) and process 0 of color 1 (ie globally rank = 2), the code just hangs up after printing received buffer. the code: program hello include 'mpif.h' implicit none integer tag,ierr,rank,numtasks,color,new_comm,inter1,inter2 integer sendbuf,recvbuf,tag,stat(MPI

问题 I am just simply trying to scatter some strings to nodes and then receive them back in a new array. When I print the new array the terminal will output name1 (empty line) (empty line) (empty line) Here is my scatter: std::string files[4] = {"name1", "name2", "name3", "name4"}; std::string recArr[4]; MPI_Scatter(files, 5, MPI_CHAR, recArr, 5, MPI_CHAR, 0, world); for(int i = 0; i < 4; i++) std::cout << recArr[i] << "\n"; 回答1: The problem is that you're only sending the first 5 characters of

问题 I created a new ubuntu-16.04.2-desktop-amd64 machine on VM VirtualBox and I want to be able to use the R environment with Rmpi. Both of the below approaches gives a similar error. Updated simplified pre-build binary approach: When Ubuntu had installed I opened a terminal and executed the following commands: ~$ sudo apt-get update ~$ sudo apt-get install openmpi-bin ~$ sudo apt-get install r-base ~$ sudo apt-get install r-cran-rmpi ~$ R This opened the R terminal and I invoking the follow

问题 I do not know if I perhaps understand this incorrectly. But here is what I want to achieve with OpenMPI in particular just starting with mpirun: I want to create a single process using the -np parameter that specifies the world size as 1 I then want to set the universe size to some arbitrary number (for argument sake 10), how do I do this? The following two commands: MPI_Comm_size(MPI_COMM_WORLD, &world_size); MPI_Attr_get(MPI_COMM_WORLD, MPI_UNIVERSE_SIZE, &universe_size, &flag); yield the

问题 I am new to using Microsoft Azure for scientific computing purposes and have encountered a few issues whilst setting up. I have a jump box set-up that acts as a license server for the software that I whish to use, is also has a common drive to store all of the software. 6 compute nodes are also set-up (16 core/node) and I can 'ssh' from the jump box to the compute nodes without issue. The jump box and compute nodes are using CentOS with OpenMPI 1.10.3 I have created a script that is stored on

问题 I have an executable on my Linux box which I know has been compiled either with OpenMPI or MPICH libraries. Question: how to determine which one? 回答1: The following diagnostic procedure assumes that MPICH/MPICH2 and Open MPI are the only possible MPI implementations that you may have linked with. Other (especially commercial) MPI implementations do exist and may have different library names and/or library symbols. First determine if you linked dynamically: % ldd my_executable linux-vdso.so.1

问题 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 where I use the username B . All machines are accessible via ssh, but I can't figure out how to achieve this. My hosts file would be like this : localhost #username local machine_set_A_1 #username A machine_set_A_2 #username A ... machine_set_B_1 #username B machine_set_B_2 #username B ... Is it

问题 when I compile my script with only #include <mpi.h> it tells me that there is no such file or directory. But when i include the path to mpi.h as #include "/usr/include/mpi/mpi.h" (the path is correct) it returns: In file included from /usr/include/mpi/mpi.h:2087:0, from lbm.cc:7: /usr/include/mpi/openmpi/ompi/mpi/cxx/mpicxx.h:35:17: fatal error: mpi.h: No such file or directory #include "mpi.h" ^ compilation terminated. Anyone know how to fix this? 回答1: The problem is almost certainly that

问题 This question already has answers here : Why is my MPI program outputting incorrectly (2 answers) Closed 5 years ago . I'm trying to create a "Hello, world!" application in (Open)MPI such that each process will print out in order. My idea was to have the first process send a message to the second when it's finished, then the second to the third, etc.: #include <mpi.h> #include <stdio.h> int main(int argc,char **argv) { int rank, size; MPI_Init(&argc, &argv); MPI_Comm_rank(MPI_COMM_WORLD,

问题 I'm using magick++ library to manage images. I want to distribute my algorithm using openMPI, is it possible to send objects? for example in my code I have Image image(imgName); int w = image.columns(); int h = image.rows(); PixelPacket *pixels = image.getPixels(0, 0, w, h); Can I send pixels with MPI_Send or Scatter of whatever? if yes with which datatype? 回答1: In general, unless you have a special library that's doing packing for you, it's never possible to send a specialized object in MPI.