DIFFERENCES BETWEEN V3.0 and V2.1

The most significant changes in this version include enabling the use of MPI directly rather than through use of the MMPI library. We have also generalized the solution data structure to include data stored at cell-edge-centers and at cell corners. The changes are,

• communication can now be done through direct use of MPI. If you wish to use MPI, you should define the preprocessor variable MPI_USED in the file headers/paramesh_preprocessor.fh.
• the solution data structure now includes arrays UNK_E_X,UNK_E_Y and UNK_E_Z for cell-edge-centered data, and UNK_N for cell-corner (or node) data.
• more general interpolation schemes are provided for the UNK and WORK arrays.
• with the addition of UNK_N, there is no longer a need to support grid block sizes with odd values. The acceptable values for NXB,NYB,NZB are now even or 1.
• when using MPI, you must define bounding volumes in which each distinct boundary condition you wish to implement is to be valid. An example is given in hydro1d_mpi.
• bug fixes for all bugs which have been reported to us since the release of V2.1.

It should be emphasized that V3.0 will support any applications which ran using V2.1, with almost no modification to the application source code. The required modifications, all of which are very minor, are summarized below.

Before beginning to use PARAMESH with MPI, you should take the time to read the `How we use MPI' section of the Users Guide. This will give you a better understanding of the constraint imposed by the use of message passing.

Modification Steps

1.
The header files physicaldata.fh, tree.fh and workspace.fh have been replaced by modules. For example, to use the module which replaces physicaldata.fh you must replace the line #include "physicaldata.fh" in your application files with the line use physicaldata and this line needs to be repositioned with any other `use' statements in accordance with the F90 rules for the placement of `use' statements. Similarily #include "tree.fh" is replaced by use tree and #include "workspace.fh" is replaced by use workspace

2.

The makefile templates which were provide in versions 1.0 and 2.0 used the standard make. Since this functions differently on different platforms, we have replaced these with a GNU make template. This requires that you have GNUmake installed on your system. The GNUmake template compiles all PARAMESH modules and source files, placing the .mod and .o files in a sub-directory called paramesh_objs.

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