Basic HTML version of Foils prepared May 12 1996

Foil 30 Special Problems with PGI HPF Compiler

From Overview of HPCC Applications at NPAC CRPC Annual Meeting -- May 14-17 1996. by Geoffrey Fox
PGI Compiler is typically very succesful but ..
PGHPF is a translator, not a "real" compiler.
We encountered situations that the fortran 77 code generated by PGHPF cannot be compiled by the native IBM xlf compiler at a decent optimalization level (O3) which leads to a lousy node performance (with linear parallel speedup).
We suspect that the problem lies in array's index expressions which are always one dimensional(?).

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