Intel® MPI Library Developer Guide for Linux* OS

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ID 768728
Date 10/31/2024
Public
Document Table of Contents
Document Table of Contents x
Intel® MPI Library Developer Guide for Linux* OS
Intel® MPI Library Developer Guide for Linux* OS x
Introduction Installation and Prerequisites Compiling and Linking Running Applications Debugging Applications Analysis and Tuning Troubleshooting Additional Supported Features Examples Notices and Disclaimers
Introduction x
Introducing Intel® MPI Library Conventions and Symbols Related Information
Installation and Prerequisites x
Installation Prerequisite Steps
Compiling and Linking x
Compiling an MPI Program Compilers Support ILP64 Support
Running Applications x
Running Intel® MPI Library in Containers Selecting a Library Configuration Running an MPI Program Running an MPI/OpenMP* Program MPMD Launch Mode Fabrics Control Job Schedulers Support Controlling Process Placement Java* MPI Applications Support
Running Intel® MPI Library in Containers x
Build a Singularity* Container for an MPI Application Run the Application with a Container
Fabrics Control x
Selecting Fabrics Libfabric* Support OFI* Providers Support
Debugging Applications x
Debugging Using -gtool for Debugging
Analysis and Tuning x
Displaying MPI Debug Information Tracing Applications Interoperability with Other Tools Through -gtool MPI Tuning
Troubleshooting x
Error Message: Bad Termination Error Message: No such file or Directory Error Message: Permission Denied Error Message: Fatal Error Error Message: Bad File Descriptor Error Message: Too Many Open Files Problem: High Memory Consumption Readings Problem: MPI Application Hangs Problem: Password Required Problem: Cannot Execute Binary File Problem: MPI limitation for Docker*
Additional Supported Features x
Asynchronous Progress Control Device-Initiated Communications Notified One-Sided Communications Multiple Endpoints Support
Multiple Endpoints Support x
MPI_THREAD_SPLIT Programming Model Threading Runtimes Support Program Examples Code Change Guide
Examples x
async_progress_sample.c See Also thread_split.cpp thread_split_omp_for.c thread_split_omp_task.c thread_split_pthreads.c
Intel® MPI Library Developer Guide for Linux* OS

async_progress_sample.c

#define PROGRESS_THREAD_COUNT 4
MPI_Comm comms[PROGRESS_THREAD_COUNT];
MPI_Request requests[PROGRESS_THREAD_COUNT];
MPI_Info info;
int idx;
/* create "per-thread" communicators and assign thread id for each communicator */
for (idx = 0; idx < PROGRESS_THREAD_COUNT; idx++)
{
        MPI_Comm_dup(MPI_COMM_WORLD, &comms[idx]);
        char thread_id_str[256] = { 0 };
        sprintf(thread_id_str, "%d", idx);
        MPI_Info_create(&info);
        MPI_Info_set(info, "thread_id", thread_id_str);
        MPI_Comm_set_info(comms[idx], info);
        MPI_Info_free(&info);
    }
/* distribute MPI operations between communicators – i.e. between progress threads */
for (idx = 0; idx < PROGRESS_THREAD_COUNT; idx++)
{
    MPI_Iallreduce(…, comms[idx], &requests[idx]);
}
MPI_Waitall(PROGRESS_THREAD_COUNT, requests, …)
Parent topic: Examples
Level Two Title