Intel® MPI Library Developer Reference for Windows* OS

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ID 768734
Date 11/07/2023
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Document Table of Contents
Document Table of Contents x
Intel® MPI Library Developer Reference for Windows* OS
Intel® MPI Library Developer Reference for Windows* OS x
Introduction Command Reference Environment Variable Reference Notices and Disclaimers
Introduction x
Introducing Intel® MPI Library What's New Intel® MPI Library 2021.11 (Intel® oneAPI 2024.0) Intel® MPI Library 2021.10 (Intel® oneAPI 2023.2) Intel® MPI Library 2021.9 (Intel® oneAPI 2023.1) Intel® MPI Library 2021.8 (Intel® oneAPI 2023.0) Intel® MPI Library 2021.7.1 (Intel® oneAPI 2022.4) Intel® MPI Library 2021.7 (Intel® oneAPI 2022.3) Intel® MPI Library 2021.6 (Intel® oneAPI 2022.2) Intel® oneAPI 2021.5 Intel® oneAPI 2021.2 Intel® oneAPI Gold Notational Conventions Related Information User Authorization
Command Reference x
Compiler Commands mpiexec.hydra cpuinfo impi_info
Compiler Commands x
Compilation Command Options
mpiexec.hydra x
Global Hydra Options Local Hydra Options
Environment Variable Reference x
Compilation Environment Variables Hydra Environment Variables I_MPI_ADJUST Family Environment Variables Tuning Environment Variables Main Thread Pinning Environment Variables for Fabrics Control Environment Variables for Memory Policy Control Other Environment Variables
Tuning Environment Variables x
Autotuning
Autotuning x
I_MPI_TUNING_AUTO Family Environment Variables
Main Thread Pinning x
Environment Variables for Main Thread Pinning Interoperability with OpenMP* API
Environment Variables for Fabrics Control x
Communication Fabrics Control Shared Memory Control OFI*-capable Network Fabrics Control
Intel® MPI Library Developer Reference for Windows* OS

What's New

This page lists some important changes to the product that are reflected in the documentation. For a list of all changes, refer to the Intel® MPI Library Release Notes or Intel® MPI Library Release Notes for Windows* OS .

Intel® MPI Library 2021.11 (Intel® oneAPI 2024.0)

  • Added new environment variables to Other Environment Variables page: I_MPI_FILESYSTEM, I_MPI_FILESYSTEM_FORCE, I_MPI_FILESYSTEM_CB_NODES, I_MPI_FILESYSTEM_CB_CONFIG_LIST, I_MPI_FILESYSTEM_NFS_DIRECT, and I_MPI_FILESYSTEM_GPFS_DIRECT.
  • Deprecated environment variables: I_MPI_EXTRA_FILESYSTEM and I_MPI_EXTRA_FILESYSTEM_FORCE.

Intel® MPI Library 2021.10 (Intel® oneAPI 2023.2)

  • Added new environment variable _MPI_OFI_MATCH_COMPLETE to the OFI*-capable Network Fabrics Control page.
  • Added the compiler-specific MPI wrappers: mpiicpx and mpiicx to the Compiler Commands page.

Additionally, minor updates have been made to fix inaccuracies in the document and improve user experience.

Intel® MPI Library 2021.9 (Intel® oneAPI 2023.1)

  • Added I_MPI_SHM,I_MPI_SHM_CELL_FWD_SIZE, I_MPI_SHM_CELL_BWD_SIZE, I_MPI_SHM_CELL_EXT_SIZE, I_MPI_SHM_CELL_FWD_NUM, I_MPI_SHM_CELL_BWD_NUM, I_MPI_SHM_CELL_EXT_NUM_TOTAL, I_MPI_SHM_CELL_FWD_HOLD_NUM, I_MPI_SHM_SEND_SPIN_COUNT, I_MPI_SHM_RECV_SPIN_COUNT variables to Shared Memory Control page.
  • Added new value forI_MPI_HYDRA_BOOTSTRAP variable.

Intel® MPI Library 2021.8 (Intel® oneAPI 2023.0)

  • Added I_MPI_SPAWN function.
  • Added the following CVARs: I_MPI_OFFLOAD_SYMMETRIC, I_MPI_OFFLOAD_RDMA, I_MPI_OFFLOAD_FAST_MEMCPY, I_MPI_OFFLOAD_IPC.
  • Changed default value of I_MPI_OFFLOAD_PIPELINE_THRESHOLD variable.

Intel® MPI Library 2021.7.1 (Intel® oneAPI 2022.4)

  • No documentation changes.

Intel® MPI Library 2021.7 (Intel® oneAPI 2022.3)

  • No documentation changes.

Intel® MPI Library 2021.6 (Intel® oneAPI 2022.2)

  • No documentation changes.

Intel® oneAPI 2021.5

  • Added hcoll argument for I_MPI_COLL_EXTERNAL.
  • Added option to Global Options topic.
  • Added I_MPI_COLL_DIRECT variable to I_MPI_ADJUST Family Environment Variables topic.
  • No documentation changes.
  • Changed the default pinning order to bunch.
  • Added new value for the I_MPI_SHM variable (icx).
  • Added new variable I_MPI_HYDRA_BSTRAP_KEEP_ALIVE.

Intel® oneAPI 2021.2

Additionally, minor updates have been made to fix inaccuracies in the document and improve user experience.

  • No documentation changes.

Intel® oneAPI Gold

  • Removed all content specific to Intel® Parallel Studio XE (see notice on title page).
  • Added Intel® Ethernet 800 Series support.
  • Added MPI + OpenMP offload examples.
  • Added new algorithm for MPI_Sendrecv_replace (I_MPI_ADJUST_SENDRECV_REPLACE=2).
  • Reworked directory layout:
    • Removed intel64/.
    • Mpivars.[c]sh and mpi modulefile moved to env/.
    • Mpivars.[c]sh renamed to vars.[c]sh.
  • Removed deprecated symbolic links.
  • Removed static libraries for debug configurations.
Parent topic: Introduction
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