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.