Basic HTML version of Foils prepared 12 May 1996

Foil 39 Special Problems with PGI HPF Compiler

From General Collection of Foils for CRPC Annual Meeting CRPC Annual Meeting -- 14-17 May 1996 Argonne. by Geoffrey C. 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(?).

Northeast Parallel Architectures Center, Syracuse University, npac@npac.syr.edu

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