Installing software using Spack¶
Spack is a package manager for supercomputers. It can be used for installing scientific software and libraries for your own software development project in an easy way.
Below you can find short information on how to use spack at PDC, but the full documentation for spack is available online at https://spack.readthedocs.io/en/latest/index.html
Please note that while there is a central Spack installation used by PDC staff to install software in
/pdc/software/..., you cannot use this yourself to install software as it is write-protected. The Spack philosophy of working is instead that you work with your own Spack installation yourself in your private space. It is possible to link your own installation to the PDC central one and reduce the number of package you need to compile by using the so-called “chaining” functionality, see more information here https://spack.readthedocs.io/en/latest/chain.html.
Installing spack is just a matter of cloning its repository
git clone -c feature.manyFiles=true https://github.com/spack/spack.git
Spack needs to be configured to work properly in the Cray compiler environment. For running Spack on Dardel, we suggest copying the configuration files from our central installation. E.g for using Spack 0.17.0 configured against the Cray programming environment 21.11:
cp -r /pdc/software/21.11/spack/0.17.0/etc/spack/* .
After this you can initialize Spack using the start script. This script will initialize your spack environment and also store the configuration files mentioned above into the spack environment.
This will put the
spack command in your
PATH and also add the Spack-generated module files to your
MODULEPATH. You can verify that the basic configuration is working by running
spack arch and
$ spack arch cray-sles15-zen2 $ spack compilers ==> Available compilers -- cce sles15-any ----------------------------------------------- email@example.com -- gcc sles15-any ----------------------------------------------- firstname.lastname@example.org email@example.com
Finding and listing available software¶
If you would like to find out what software you can install, use the
$ spack list kokkos ==> 6 packages. kokkos kokkos-kernels kokkos-kernels-legacy kokkos-legacy kokkos-nvcc-wrapper py-pykokkos-base
More details about a specific packages, such as configuration flags and build options can be seen with
$ spack info kokkos $ spack info kokkos CMakePackage: kokkos Description: Kokkos implements a programming model in C++ for writing performance portable applications targeting all major HPC platforms. Homepage: https://github.com/kokkos/kokkos Maintainers: @DavidPoliakoff @jciesko Externally Detectable: False Tags: e4s Preferred version: 3.4.01 https://github.com/kokkos/kokkos/archive/3.4.01.tar.gz ...
Installing software using spack¶
Installing software using spack in the most basic way is simply:
spack install <software>
If there are other packages or libraries that needs to be installed for this software to work, they are also installed automatically. In general, though, you would like to be more specific, and request a certain version of a software, or maybe a specific compiler to be used. There is a specific syntax for doing that:
Which version to install/use
Which compiler to use
Add a specific dependency
This is an example of an installation of Amber 18 where it is compiled with GCC version 9.3.0 and a specific ncurses package
spack install amber@firstname.lastname@example.orgemail@example.com ... ==> amber: Successfully installed amber-18-js3n7jolbdh7gknbfuiwf5vutoaljckd Fetch: 1.09s. Build: 46.92s. Total: 48.01s. [+] $HOME/spack/opt/spack/cray-sles15-zen2/gcc-9.3.0/amber-18-js3n7jolbdh7gknbfuiwf5vutoaljckd
It is often useful to do a dry run before installing to see what Spack thinks it needs to install. This can be done with
spec command. For example, what will happen when we request LINPACK?
$ spack spec -I hpl Input spec -------------------------------- - hpl Concretized -------------------------------- - firstname.lastname@example.orgemail@example.com~openmp arch=cray-sles15-zen2 [+] ^firstname.lastname@example.orgemail@example.com~mpi~openmp+shared arch=cray-sles15-zen2 [+] ^firstname.lastname@example.orgemail@example.com~argobots+fortran+hwloc+hydra+libxml2+pci+romio~slurm~two_level_namespace~verbs+wrapperrpath device=ch4 netmod=ofi pmi=pmi arch=cray-sles15-zen2
Here Spack will compile and install LINPACK using gcc version 11.2.0, MPICH for MPI, and Cray’s LibSci for BLAS and LAPCK. Only the LINPACK package itself will be compiled. Cray Libsci and MPICH are already installed, as indicated by the
[+] symbols at the beginning of the lines.
Installing non-downloadable software¶
In some cases it is not possible to directly download the software you are interested in as the software is restricted by license or other.
In this case you have to download it manually and create folder for it. See instructions at https://spack.readthedocs.io/en/latest/basic_usage.html#non-downloadable-tarballs
Installing and uninstalling softwares will in the end use up your disk space so it is good practice to do some garbage collection
How to execute your software¶
Software installed by Spack are put in the directory
spack/opt/spack/cray-sles15-zen2/<compiler>/<software>. This can be a bit tedious to use every time, so there are two ways to make it more convenient. Spack automatically makes module files for all installed software, which shows up when you do
module avail, provided that you can run the Spack initilization script mentioned above. You can then use the
module load command in the way as you would do for other software at PDC, but in this case you load a software from your own Spack installation.
$ module avail hpl --------------------------- /cfs/klemming/scratch/y/ypetla/spack/spack/share/spack/modules/cray-sles15-zen2 --------------------------- hpl-2.3-gcc-11.2.0-5v2u3sq
Alternatively, you can use Spack’s built-in mechanism for loading software packages, which works similarily to
$ spack load hpl $ which xhpl /cfs/klemming/pdc/software/dardel/21.11/spack/spack/opt/spack/cray-sles15-zen2/gcc-11.2.0/hpl-2.3-5v2u3sqa3huu2djhxdtjxbfaoysdwfpy/bin/xhpl
…and the software will be directly available via your command line.