when I type ompi_info on my terminal, I get a huge output on my terminal buffer, a part of which looks like :
Package: Open MPI buildd@lgw01-57 Distribution
Open MPI: 1.10.2
Open MPI repo revision: v1.10.1-145-g799148f
Open MPI release date: Jan 21, 2016
Open RTE: 1.10.2
Open RTE repo revision: v1.10.1-145-g799148f
Open RTE release date: Jan 21, 2016
OPAL: 1.10.2
OPAL repo revision: v1.10.1-145-g799148f
OPAL release date: Jan 21, 2016
MPI API: 3.0.0
Ident string: 1.10.2
Prefix: /usr
Configured architecture: x86_64-pc-linux-gnu
Configure host: lgw01-57
Configured by: buildd
Ignoring the info on release dates, I am curious specifically about the meaning of second line: Open MPI : 1.10.2 and line number twelve: MPI API : 3.0.0 . Does it mean the new functions from Open MPI version 3.0.0 available on the MPI version 1.10.2 ?
Answering my own question, it seems yes, the stable version of OpenMPI 1.10 supports most of the new features introduced in MPI 3 . This page of OpenMPI-1.10.1 shows the list of all MPI API's available which includes the API for one sided communication, which was introduced in MPI version 2.0, and features of MPI 3.0 like non-blocking collective operations like MPI_Ibcast and matching probes like MPI_Mprobe and MPI_Mrecv.
Although this list also doesn't contain the MPI_T tool interface and many other features which is available in the current stable release of openMPI-3.0 .