The OPAL Discussion Forum

[Yves Ineichen <yves.ineichen AT psi.ch>]

Hi all,

I made some changes[1] with respect to the MPI Communicator in IPPL.
Basically you can now run OPAL (any application using IPPL) on a
subset of processors by passing a user defined MPI group to the IPPL
constructor. This parameter defaults to MPI_COMM_WORLD so you don't
have to change anything if you want to use IPPL as before.

To adapt OPAL to the new MPI communicator mechanism I had to adapt
some pure MPI_* and H5OpenFile calls (by using Ippl::getComm() to get
the currently used communicator). Long story short: When you update
OPAL to r12707[1] you NEED TO UPDATE AND REBUILD IPPL as well!

Sidenote: [2] also introduces a crude OPAL library wrapper (see
src/opal.h/cpp). This means OPAL can now be called as a library from
other projects/code/languages.


Best regards,


[1] https://amas.psi.ch/IPPL/changeset/12699
[2] https://amas.psi.ch/OPAL/changeset/12707

-- 
Yves Ineichen
Paul Scherrer Institut WLGB/125 CH-5232 Villigen PSI
Phone Office: +41 56 310 37 63
http://amas.web.psi.ch
::p = "This statement cannot be proven"::