- Compiler Support for the Fortran 2008 Standard. The table below documents features from the Fortran 2008 standard that are supported by recent versions of several available compilers. Of course, development versions of some compilers support may additional features.
- The PGI compilers and tools are supported on both 32-bit and 64-bit variants of the Linux, Apple OS X, and Windows operating systems on a variety of x86-compatible processors. CUDA Fortran includes a Fortran 2003 compiler and tool chain for programming NVIDIA;.
- PGI Community Edition includes a no-cost license to a recent release of the PGI Fortran, C and C++ compilers and tools for multicore CPUs and NVIDIA Tesla GPUs, including all OpenACC, OpenMP and CUDA Fortran features. The PGI Community Edition enables development of performance-portable HPC applications with uniform source code across the most.
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I'm currently attempting to accelerate a spectral element fluids solver by porting most of the routines to a GPGPU using OpenACC with the PGI (15.10) compiler. The source code is written in OO-Fortran. This software has 'layers' of subroutines that call other functions and subroutines. To bring the code over to a GPU using openacc, I've been first attempting to place '$acc routine' directives in each routine that needs to be ported. During compilation, using 'pgf90 -acc -Minfo=accel', I receive the following error :
nvvmCompileProgram error: 9.
Error: /tmp/pgacc2lMnIf9lMqx8.gpu (146, 24): parse invalid forward reference to function 'innerroutine_' with wrong type!
PGF90-S-0155-Compiler failed to translate accelerator region (see -Minfo messages): Device compiler exited with error status code (Test.f90: 1)
This same problem can be reproduced with the following simple fortran program :
Again, compiling the above program with 'pgf90 -acc -Minfo=accel' yields the problem.
Does openacc support acc-enabled routines calling other acc-enabled routines ?
If so, what am I doing wrong ?
1 Answer
You're using the OpenACC 'routine' directive correctly. The problem here is that we (PGI) don't yet support using 'routine' with array-valued functions. The problem being that this support requires the compiler to create a temp array to hold the return value. Meaning that every thread would need to allocate this temp array causing a severe performance penalty. Worse is how to handle sharing the temp array if is a gang or worker level routine.
We do have open requests for this feature, but it may be awhile before we can address it. In the meantime, can you try inlining the routine? i.e. compile with '-Minline'.
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