This page provides the current Release Notes for Intel® MPI Library. The notes are categorized by year, from newest to oldest, with individual releases listed within each year.
Click a version to expand it into a summary of new features and changes in that version since the last release, and access the buttons for the detailed release notes, which include important information, such as prerequisites, software compatibility, installation instructions, and known issues.
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Intel® MPI Library 2021 Update 18.0 - oneAPI 2026.0
What's New
- Expanded MPI 5.0 standard technical preview with ABI compatibility for Fortran/Linux and C/Windows
- Linux only: Introduced technical preview of Intel® Arc™ Pro B-Series GPU support (single node)
- Added full support for Clearwater Forest processors and optimized single node performance
- Linux only: Added technical preview capability for non-mpiexec based job launching to support AI frameworks and applications
- Linux only: Enhanced multithreaded communication scalability with expanded thread split mode support
- Reduced job startup latency for single node workloads by defaulting to SHM fabric
- Added new tunable Alltoall algorithms accessible via I_MPI_ADJUST_ALLTOALL (values 14–18)
- Linux only: Addressed a CPU affinity issue by updating the default I_MPI_HYDRA_BRANCH_COUNT value for slurm
- Improved compatibility with Intel’s latest compiler toolchains while maintaining backward compatibility
- Integrated libfabric v2.4.0 for more reliable communication
- Updated IMB to version 2021.11, with multiple stability and compatibility fixes
- Clarified versioning with explicit patch numbers (e.g., 2021.18.0)
Note for Windows users: Hydra service must be reinstalled after updates when using a custom port due to this change in version numbering - Bug fixes
System Requirements
Hardware Requirements
Systems based on the Intel® 64 architecture, in particular:
- Intel® Core™ processor family or higher
- Intel® Xeon® Scalable processor family
- Intel® Xeon® 6 processor family
- 1 GB of RAM per rank (2 GB recommended)
- 1 GB of free hard disk space
Supported Accelerators (Linux only)
- Intel® Data Center GPU Max SeriesIntel® Arc™ Pro B-Series GPU. Nvidia* GPUs (minimal tested version is NVIDIA* Tesla P100).
Drivers and Libraries
- oneAPI Level Zero API 1.0.
- CUDA* Version 11.3 or higher.
Software Requirements
Linux* OS
- Red Hat* Enterprise Linux* 8, 9, 10
- SUSE* Linux Enterprise Server* 15 SP5, 15 SP6, 15 SP7
- Fedora* 41, 42
- Rocky Linux* 9
- Amazon* Linux 2025, 2023
Compilers
- GNU*: C, C++, Fortran 77 3.3 or newer, Fortran 95 4.8.0 or newer
- Intel® C++/Fortran Compiler 17.0 or newer
Debuggers
- Rogue Wave* Software
- TotalView* 6.8 or newerAllinea*
- DDT* 1.9.2 or newer
- GNU* Debuggers 7.4 or newer
Batch Systems
- Platform* LSF* 6.1 or newer
- Altair* PBS Pro* 7.1 or newer
- Torque* 1.2.0 or newer
- Parallelnavi* NQS* V2.0L10 or newer
- NetBatch* v6.x or newer
- SLURM* 1.2.21 or newer
- Univa* Grid Engine* 6.1 or newer
- IBM* LoadLeveler* 4.1.1.5 or newer
- Platform* Lava* 1.0
Fabric Software
- Open Fabric Interface (OFI): https://github.com/ofiwg/libfabric
- Minimum: OFI 1.13.2
- Recommend to use OFI provided with IMPI
Supported Languages
- For GNU* compilers: C, C++, Fortran
- For Intel® compilers: C, C++, Fortran
Clustered File Systems
- IBM Spectrum Scale* (GPFS*)
- LustreFS*PanFS*NFS* v3 or newer
Linux General Purpose Intel® GPUs (GPGPU) Driver:
For all Intel® GPUs, see this article, https://dgpu-docs.intel.com/, and follow the directions for your device.
Windows* OS
- Microsoft* Windows* Server 2019, 2022
- Microsoft* Windows* 10, 11
(SDK only) Compilers
- Intel® C++/Fortran Compiler 17.0 or newer
- Microsoft* Visual Studio* Compilers 2020
Batch systems
- Microsoft* Job Scheduler
- Altair* PBS Pro* 9.2 or newer
Fabric software
- Open Fabric Interface (OFI): https://github.com/ofiwg/libfabric
- Minimum: OFI 1.13.2
- Recommend to use OFI provided with IMPI
Supported languages
- For GNU* compilers: C, C++, Fortran
- For Intel® compilers: C, C++, Fortran
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