NAME

       Process Management Interface - Exascale

SYNOPSIS

              #include <pmix.h>

OVERVIEW

       The  Process Management Interface (PMI) has been used for quite some time as a means of exchanging wireup
       information needed for interprocess communication.  Two versions (PMI-1 and PMI-2) have been released  as
       part of the MPICH effort.  While PMI-2 demonstrates better scaling properties than its PMI-1 predecessor,
       attaining  rapid  launch  and wireup of the roughly 1M processes executing across 100k nodes expected for
       exascale operations remains challenging.

       PMI Exascale (PMIx) represents an attempt to resolve these questions by providing an extended version  of
       the  PMI  standard  specifically  designed  to  support clusters up to and including exascale sizes.  The
       overall objective of the project is not to branch the existing pseudo-standard  definitions  -  in  fact,
       PMIx  fully  supports  both  of  the existing PMI-1 and PMI-2 APIs - but rather to (a) augment and extend
       those APIs to eliminate some current restrictions that impact scalability, and (b)  provide  a  reference
       implementation of the PMI-server that demonstrates the desired level of scalability.

SEE ALSO

AUTHORS

       PMIx.

PMIx Programmer's Manual                           2015-10-29                                            pmix(7)