[mpich-devel] [mpich-discuss] Change in SOVERSION of mpich 3.4 ?

Wed Jan 6 11:41:13 CST 2021

Hi,

We did not bump the major version because MPIX_Mutex interfaces were "experimental" in nature. Our position is that we update the ABI version based on official MPI standard functionality only.

Ken

On 1/6/21, 3:55 AM, "Alastair McKinstry via discuss" <discuss at mpich.org> wrote:

    Dear MPICH developers,

    I see that MPICH 3.4 has been released - Happy New Year and 
    congratulations to all involved.

    I'm one of the Debian Maintainers of MPICH, and have a question though : 
    should the SOMAJOR version not have been increased?

     From the CHANGES log, the following look concerning:

    # Change the signature of MPID_Init to include requested and provided
       thread levels.

    # Remove support for logical reduction operations on floating point
       types.

    # Remove MPIX_Mutex interfaces.

    Typically when functionality is removed from a library, or signatures 
    change, the major version is incremented (the minor version can be for 
    additions, such as the other functionality added. Are these changes 
    purely internal to MPICH, or has the ABI changed ?

    This matters to the distributions such as Debian because we ship the 
    shared libs based on SOVERSION; ie the binary package "libmpich12" 
    currently contains libmpich.so.12.18 and libmpich.so.12 , and if mpich 
    3.4 is packaged as-is, will contain libmpich.so.12.1.9 (ansd symlink 
    libmpich.so.12)  and it is necessary for applications to be able to use 
    this as a drop-in replacement. On seeing these changes in the release 
    logs, I had been anticipating that the next version would be 
    libmpich13.0.0 (or similar), shipped in "libmpich13".  This enables 
    upgrades; both libmpich12 and libmpich13  can co-exist.

    Can you confirm whether the ABI changes, and this is a drop-in replacement ?

    Regards

    Alastair McKinstry

    -- 
    Alastair McKinstry, <alastair at sceal.ie>, <mckinstry at debian.org>, https://diaspora.sceal.ie/u/amckinstry
    Misentropy: doubting that the Universe is becoming more disordered.

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