AMD Optimized Compiler Collection (AOCC)

Supported versions

To check which AMD AOCC versions are currently supported on Discoverer, execute on the login node:

module avail amd/aocc/

To obtain access to the latest AMD AOCC load the environment module aocc/latest:

module load amd/aocc/latest

otherwise replace latest with the version you need.

Warning

AOCC provides LLVM compilers only!

clang
clang++
flang

Note

The compute nodes of Discoverer HPC are equipped with AMD EPYC 7H12 64-Core processors, which implies AMD Zen2 CPU architecture.

The following compiler flags can be useful during the compile-time optimization of your binary code on AMD Zen2:

-march=znver2 -mtune=native

For example:

clang -march=znver2 -mtune=native ...
clang++ -march=znver2 -mtune=native ...
flang -march=znver2 -mtune=native ...

It is recommended to specify the compiler executables when invoking cmake tool:

-DCMAKE_C_COMPILER=clang
-DCMAKE_CXX_COMPILER=clang++
-DCMAKE_Fortran_COMPILER=flang

The corresponding optimization compiler flags can be passed to cmake as well:

-DCMAKE_C_FLAGS="-march=znver2 -mtune=native"
-DCMAKE_CXX_FLAGS="-march=znver2 -mtune=native"
-DCMAKE_Fortran_FLAGS="-march=znver2 -mtune=native"