NAG Parallel Fortran Library

The NAG Parallel Fortran Numerical Program Library is available on the Cray T3E.

The library consists actually of six libraries at /usr/local/lib/

        libnagmpi.a
        libnagmpiz.a
        libnagblas.a
        libnagmpiblacs.a
        libnagtools.a
        libnagfls.a

and can be used quite simply following the example script

        /usr/local/lib/fdcre02sm/scripts/nscexample

The documentation is available at NSC as printed manuals. You can also read some of it on the network directly from Oxford.

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NAG Parallel Fortran Library Users's Note for the Cray T3E (in man format, this is a very important document with system dependent details)

The library is in the default Cray T3E floating point precision, eight bytes (double precision IEEE floating point precision) and is simply called REAL in Fortran. The library is presently at Release 2 and has been compiled with CF90 v3.0.2.3.

Additional user information

On the T3E area /usr/local/lib/fdcre02sm/, also called /appl/lib/fdcre02sm/, there are extra copies of the six libraries mentioned above and four directories:

doc with some interesting documents. Of special interest here are the Essential Introduction, essint.ps, and the Tutorial, tutorial/tutorial.ps.
examples with different subdirectories for data, results, and source, for examples for most of the library routines.
scripts with some scripts, including the useful nscexample. The other scripts there have however not yet been tuned for our T3E.
source with the source code.

The example programs are easy to use through the nscexample script. On your own directory you give the command

/usr/local/lib/fdcre02sm/scripts/nscexample NAG_name

where NAG_name is the name of the routine you wish to test, for example d01atfp for adaptive quadrature on a finite interval, allowing for badly behaved integrands. The example program, together with its data file (if any), will be copied to your present directory, compiled, linked, and run. The result file will be put in the subdirectory newresults.

I recommend that you introduce an alias for the long command string required to use nscexample.

Addendum 1999-06-28:

FULLOPT='-O 3,agress'

UNOPT='-O 0'

The example program can quite often be used as the basis for the application program you are about to write. It includes the initial call of Z01AAFP to initialise a 2-D-grid for MPI and the final call of Z01ABFP to un-define the grid.

There are no official C header files available for using the parallel library from C or C++.

Additional NAG Libraries

NAG also has a serial Fortran 77 Library (installed on our T3E), and a new numerical library written in full Fortran 90 (not installed on our T3E).

Assistance and support

Questions are welcome to Bo Einarsson, who has more than 25 years experience with NAG libraries. You can also contact NAG directly, either using email to infodesk@nag.co.uk or the form.

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