The ABI compatibility initiative applies within the same implementation as well. So all MPICH versions back to MPICH 3.1 are binary compatible with each other. https://www.mpich.org/abi/ <https://www.mpich.org/abi/> It’s possible that MPICH 3.0 is also compatible, but I don’t think there were any guarantees or tests. You might just get lucky if that’s the version you want. Thanks, Wes

On Mar 17, 2020, at 7:40 AM, Saurabh T via discuss <[email protected]> wrote:

What is the guarantee for binary (ABI) compatibility between MPICH versions? I am not referring to the ABI compatibility initiative with other MPI implementations, but between different versions of MPICH. For example, is MPICH 3.3 ABI compatible with MPICH 3.0? Thank you.

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