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

• After trying to compile a Fortran code I got this error:

PGF90-S-0021-Label field of continuation line is not blank

Solution:

Add the -Mpreprocess compiler flag

• 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

• After compiling the code, this runtime error appeared:

call to cuModuleGetFunction returned error 500: Not found

Solution:

Change the -ta compiler flag to:

-ta=tesla:nordc,cc35