PGI: PGI and OpenACC

Compiling the code with OpenACC support

In order to find the correct flags for the compiler run:

pgaccelinfo

The flags are in the last output line. Example:

pgicc/pgfortran -ta=tesla:cc35

Note: Don't forget to add the OpenACC flags to the linker:

pgicc/pgfortran -acc -acclibs

Issues met

1. After trying to compile a Fortran code I got the following error:

/tmp/pgaccTlnihVRmAnZx.gpu(244): error: expression must have class type

Solution:

There was an OpenACC directive that was causing the problem, which was commented out:

!$ACC  parallel present(alpha,nitcg) 
      alpha=0
      nitcg=nitcg+1
!$ACC  end parallel