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Warning!

Puhti and Mahti are being decommissioned in stages, and their storage areas will become fully unavailable from 15 October 2026. Clean up unnecessary files and move any data you need to keep by 31 August 2026. See the Roihu data migration guide for instructions on transferring your data to Roihu.

Puhti scratch is very full: keep only active data there and move or delete everything else. No new Puhti scratch quota will be granted.

High-performance libraries

Various high-performance libraries for dense linear algebra, fast Fourier transforms, etc. are available via the module system. Many libraries are provided both as single-threaded and multithreaded versions, multithreaded modules are designated with omp in the module version. For pure MPI applications and applications calling libraries from multiple threads it is recommended to use a single- threaded library.

Availability of libraries may depend on the loaded compiler suite and MPI environment, use module avail for finding out available libraries. See the documentation of the library for instructions on how to build against it. Note that most modules set LIBRARY_PATH and LD_LIBRARY_PATH environment variables so that the -llibrary linker flag is often enough. Most modules set also <library>_INSTALL_ROOT environment variables that can be utilized in custom build scripts. As an example, the fftw library can be used as follows:

module load fftw
<compiler_command> -o myprog myprog.o -lfftw3

and the directory containing include, lib, etc. is found under the FFTW_INSTALL_ROOT environment variable.

Libraries on Roihu-CPU

Selected libraries available on Roihu-CPU:

  • Dense linear algebra: openblas, amdblis
  • Dense distributed linear algebra: netlib-scalapack
  • Fast Fourier transforms: fftw

Libraries on Roihu-GPU

Selected libraries available on Roihu-GPU:

  • For Grace CPU:
  • Dense linear algebra: nvhpc (includes NVPL), openblas, netlib-lapack
  • Dense distributed linear algebra: nvhpc (includes NVPL), netlib-scalapack
  • Fast fourier transforms: nvhpc (includes NVPL), fftw
  • For Hopper GPU:
  • CUDA (module cuda/nvhpc) includes libraries such as cublas, cufft, cusolver, ...

Libraries on Puhti

Selected libraries available on Puhti:

  • Dense linear algebra: intel-oneapi-mkl
  • Dense distributed linear algebra: intel-oneapi-mkl, netlib-scalapack
  • Fast fourier transforms: fftw

Libraries on Mahti

Selected libraries available on Mahti:

  • Dense linear algebra: openblas, amdblis, amdlibflame
  • Dense distributed linear algebra: netlib-scalapack, amdscalapack
  • Fast fourier transforms: fftw