Planguage Field Guide
Planguage Programmers' Field Guide
This page provides a field guide to writing programs
with the Planguages. Together with the
usage page and the examples
there, one can find most that is needed to
develop, build and run parallel programs with
the Planguage distribution. However, there are
many fine points that one will inevitably want
to sort out; the
documentation set covers these
in detail.
Please check the usage page for details
about the makefile system and examples.
The Source Code and Translation Process
The Planguage make system provides for executing a
preprocessor on Pfortran code. The preprocessor
directives are those for cpp with a # in column 1.
The make system will automatically invoke a preprocessor
for files with a .PF extension, for example,
- pfsort.PF
The preprocessor produces
- pfsort.pf
The pfc translator is invoked on the pf file to generate
the Fortran file with a .f extension, for example
- pfsort.f
This is compiled by the native compiler selected by the
Planguage make system.
Built in Variables
In translating the pf source, the translator will introduce
built in variables and scratch storage. The built in variables are
-
|
myProc
|
local process logical identifier
|
|
nProc
|
number of processes
|
|
nProc0
|
zero-based number of processes, i.e., nProc-1
|
Note that these variables are automatically declared and defined by the
translator and inserted into the .f file. Do not declare
or define these built in variables in the .PF and .pf files.
These variable are intended to be read only in your code.
Earlier versions of the Planguages used different names for
the three builtin variables described above. The following
names are not longer used
-
|
thisnode
|
replaced by myProc
|
|
numnode
|
replaced by nProc
|
These default names can be changed on the Planguage
translator line with the switches
-
| -T name |
name replaces myProc
|
| -N name |
name replaces nProc
|
| -N0 name |
name replaces nProc0
|
Scratch Space
The tranlators use scratch space for buffering messages
in generated message passing code. The default size of
this buffer is 100,000 integers. One can increase
the size of this buffer with the flag
-
- -scratch number_of_integers
Please see the manuals for more information.
THIS SECTION UNDER DEVELOPMENT
page last updated January 20, 1999