Difference between revisions of "Installation/HowTo Pstream"

From OpenFOAMWiki
(Pstream for hpmpi)
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which is the place where the Pstream library will be put.
 
which is the place where the Pstream library will be put.
  
- in your rules directory ($WM_DIR/rules/$WM_ARCH) make a mplib${WM_MPLIB} file. In my example: mplibMPIGAMMA. Usually easiest to start from e.g. the LAM one.
+
- in your rules directory ($WM_DIR/rules/$WM_ARCH) make a mplib${WM_MPLIB} file. In my example: mplibMPIGAMMA. Usually easiest to start from e.g. the OpenMPI one.
  
 
- go to $FOAM_SRC/Pstream
 
- go to $FOAM_SRC/Pstream
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That is all. Now all of OpenFOAM will use your communication library.
 
That is all. Now all of OpenFOAM will use your communication library.
  
If you are investigating higher performance replacements for e.g. LAM,OpenMPI have a look at GAMMA (http://www.disi.unige.it/project/gamma/index.html). This is fully supported since {{Version1.4}}.
+
If you are investigating higher performance replacements for e.g. OpenMPI,LAM, have a look at Open-MX
 +
http://open-mx.gforge.inria.fr/) or MPI-GAMMA (http://www.disi.unige.it/project/gamma/index.html).
  
  

Revision as of 13:45, 12 February 2009

All OpenFOAM applications do parallel communication through the Pstream library only so using any underlying message passing library (MPI, GAMMA) is just a matter of replacing Pstream. One can have multiple versions and just change the LD_LIBRARY_PATH to pick up the wanted one.

- in your ~/.OpenFOAM-1.XXX/bashrc define (or uncomment) WM_MPLIB to be the name of your message passing library. E.g.

  export WM_MPLIB=MPIGAMMA

- in the central OpenFOAM/OpenFOAM-1.XXX/.bashrc set all the additional settings for your WM_MPLIB. The only non-optional setting is

FOAM_MPI_LIBBIN

which is the place where the Pstream library will be put.

- in your rules directory ($WM_DIR/rules/$WM_ARCH) make a mplib${WM_MPLIB} file. In my example: mplibMPIGAMMA. Usually easiest to start from e.g. the OpenMPI one.

- go to $FOAM_SRC/Pstream

 ./Allwmake

- this will have made a $FOAM_MPI_LIBBIN/libPstream.so

That is all. Now all of OpenFOAM will use your communication library.

If you are investigating higher performance replacements for e.g. OpenMPI,LAM, have a look at Open-MX http://open-mx.gforge.inria.fr/) or MPI-GAMMA (http://www.disi.unige.it/project/gamma/index.html).


Pstream for HPMPI


Linking the proprietary HP-MPI is slightly more tricky than the standard method described above. In addition to the steps outlined, a symbol needs to be pre-defined to prevent the inclusion of C++ bindings.

After modifying the OpenFOAM login files, copy mplibOPENMPI to mplibHPMPI in $WM_DIR/rules/$WM_ARCH$WM_COMPILER and edit it as follows:

 PFLAGS = -D_MPICC_H
 PINC = -I$(HPMPI_PATH)/include
 PLIBS = -L$(HPMPI_PATH)/lib/linux_amd64 -lmpi

Pre-defining the "_MPICC_H" symbol causes the linker to skip out the section of mpiCC.h that normally causes problems. Why HP have not deigned to include an explicit switch to disable C++ bindings is unclear.

Follow the rest of the steps normally.