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prgenv-nvfortran

The prgenv-nvfortran uenv provides a set of tools and libraries for building applications that need the NVIDIA Fortran compiler Specifically, it is intended for building and running applications that require one of the following: * OpenACC for GPU acceleration; * CUDA Fortran for GPU acceleration.

Note

By default, use the prgenv-gnu toolchain for a generic environment for building GPU applications. It provides CUDA and libraries with GPU support enabled for the Grace-Hopper nodes, the gnu compiler toolchain that it provides has better C and C++ standards compliance, and it also provides more libraries and tools than this nvfortran uenv.

Versioning

The naming scheme is prgenv-nvfortran/<version>:v<i>, where <version> matches the version of the NVIDIA HPC SDK.

  • the SDK is released every two months, and is numbered in the YY.M[M] format, e.g. 24.1 and 24.11.
  • the prgenv-nvfortran will be released two or three times a year (every second NVHPC release).

The currently supported versions are:

prgenv-nvfortran NVHPC
24.11 24.11
25.7 25.7
I need a different version

If you need a version of the NVHPC SDK that is not provided, e.g. the 25.1 version that falls between 24.11 and 25.4, make a request on the CSCS service desk.

Version 24.11 provides the following software:

The package main update from the previous version 24.11 is the addition of NCCL, the addition of libfabric to the uenv, and the SquashFS tools:

Note

Version 25.7 upgraded to Spack 1.0, so any Spack workflows based on the previous version will probably need to be updated to the latest Spack version.

Version 24.11 provides the following software:

How to use

The image is only provided on Alps systems that have NVIDIA GPUs. To see which versions have been installed on a system:

# search for uenv on the current system
uenv image find prgenv-nvfortran

# search for uenv on all systems
uenv image find prgenv-nvfortran@*

# pull a version
uenv image pull prgenv-nvfortran/25.7:v1

The nvfort view loads all of the packages into your environment (equivalent to loading all the modules at once):

uenv start prgenv-nvfortran/25.7:v1 --view=nvfort
mpif90 --version

The above example shows that the MPI compiler wrappers are using the underlying NVIDIA compiler. The following wrappers are available:

  • mpif77
  • mpif90
  • mpifort

And the following C/C++ wrappers are available:

  • mpicc
  • mpicxx

The modules view will start the uenv, and make a set of modules available:

$ uenv start prgenv-nvfortran/25.7:v1 --view=nvfort,modules
$ module avail
---------------------------- /user-environment/modules ------------------------
     aws-ofi-nccl/1.16.0    libtree/3.1.1           nvhpc/25.7
     cmake/3.31.8           lua/5.4.6               nvpl-blas/0.4.0.1
     cray-mpich/8.1.32      lz4/1.10.0              nvpl-lapack/0.3.0
     cuda/12.9.0            meson/1.7.0             osu-micro-benchmarks/7.5
     fftw/3.3.10            nccl-tests/2.16.3       python/3.13.5
     fmt/11.2.0             nccl/2.27.5-1           squashfs/4.6.1
     gcc/13.4.0             netcdf-c/4.9.2          zlib-ng/2.2.4
     hdf5/1.14.6            netcdf-fortran/4.6.1
     libfabric/1.22.0       ninja/1.12.1

None of the modules are loaded by default, so you will have to load the required modules