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<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222">I apologize for my incompetence with meeting scheduling and attendance this week. Hopefully this time I am able to get the timing correct
and also attend.<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222">The topics / decisions of interest are:<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222">A. Integer constants<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222">We have constants that must be powers of two (mode constants), constants that must have a < relationship (error codes and thread levels),
constants that should be negative to avoid conflicting with e.g. ranks, and constants that can be anything.<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222">I have a proposal for constants here: <a href="https://github.com/mpiwg-abi/specification-text-draft/blob/main/IntegerConstants.md" target="_blank"><span style="color:#1155CC">https://github.com/mpiwg-abi/specification-text-draft/blob/main/IntegerConstants.md</span></a>.
I have not yet implemented Dan's suggestion to make constants unique (presumably, for the aforementioned categories that allow it).<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222">I would like feedback on the following:<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222">1. Are the values of MPI_MAX_*** acceptable? In all cases, I chose the greater of MPICH and OMPI. For MPI_BSEND_OVERHEAD, I used 512
to be safe. Is that too large? Is 128 better?<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222">2. Are there any opponents to Dan's suggestion that all the constants are unique, within reason? If the consensus favors this, I'll redo
all the constants accordingly.<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222">3. Are there any other integer constant values that bother people? I have very little attachment to any of them, and it is trivial to
change them now.<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222">B. Handle constants<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222">I implemented a Huffman code for these (<a href="https://github.com/mpiwg-abi/specification-text-draft/blob/main/HandleConstants.md" target="_blank"><span style="color:#1155CC">https://github.com/mpiwg-abi/specification-text-draft/blob/main/HandleConstants.md</span></a>).
I made a Python <a href="https://github.com/mpiwg-abi/specification-text-draft/blob/main/print-handle-constants.py" target="_blank"><span style="color:#1155CC">code</span></a> that implements it, and the program dumps all the values, and can be modified easily
to generate mpi_abi.h.<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222">Does anyone oppose the idea of a Huffman code? I know Hui is indifferent, which is obviously fine. One can ignore the Huffman code and
just view the results as some random values I chose :-)<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222">If you like Huffman codes, but dislike mine, then please complain soon. There are some parts that I do not love. For example, fixed size
types are handled consistently and encode their size (as the log_2 of bytes) in bits 3:5, while language default types are on a different branch and encode their size in bits 8:10. I can makes those consistent, but it means the code branches aren't sequential
in the bit indices. I think that's fine, but I am new to Huffman codes.<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222">An alternative to the above is to say that in mpi_abi.h, that MPI_INT, MPI_LONG and MPI_LONG_LONG are aliased to MPI_INTn_T according to
the ABI definition, and do not exist on their own. This has some appeal, but will change the results of MPI_Type_get_name. What do people think about this?<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222">The good news is there is lots of free space in the Huffman code for new handle types and new constants. I am not worried about running
out of space. Already, I have reserved space for a bunch of types that are likely to exist in C and C++ in the near future, so those will be trivial to add later.<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222">Finally, as noted on Slack, we have to figure out whether we reserve space for or standardize some types that OMPI defines today in the
MPI_ namespace. This is the lowest priority for me right now, so if we don't address it this week, that is fine.<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:12.0pt;font-family:'Arial',sans-serif;color:#222222">Jeff<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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