Install your scientific software stack easily with Spack
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1 Install your scientific software stack easily with Spack Les mardis du développement technologique Florent Pruvost (SED)
2 Outline 1. Context 2. Features overview 3. In practice 4. Some feedback Florent Pruvost (SED) Install your scientific software stack easily with Spack 2
3 1Context Florent Pruvost (SED) Install your scientific software stack easily with Spack 3
4 A scientific software stack modular, several languages, different build systems Application Linear Algebra Optimized Kernels Graph Processing Runtime Systems Paradigms Miscellaneous difficulty to be an expert in all the chain Florent Pruvost (SED) Install your scientific software stack easily with Spack 4
5 An example: Aerosol a finite elements library developed by the Inria teams Cagire and Cardamom Aerosol PaMPA PaStiX HDF5 XML2 PT-SCOTCH StarPU BLAS/LAPACK MPI CUDA Florent Pruvost (SED) Install your scientific software stack easily with Spack 5
6 Constraints R&D develop prototypes - test many different builds computing/data intensive application HPC environment - different machines, OSes, environments - remote connection, not administrator performances highly tuned installation - well chosen components - specific build options reproducibility - control the environment - characterize what influence the build Florent Pruvost (SED) Install your scientific software stack easily with Spack 6
7 Wish list a simple process to install a default version a flexible way to choose build variants - choose compiler, software versions - enable components, e.g. MPI : yes/no - build options, e.g. --enable-debug be able to install it on a remote machine (supercomputer) - no root permissions - no internet access (not necessarily) be able to reproduce experiments - not destructive installation - control the environment and thirdparty libraries Florent Pruvost (SED) Install your scientific software stack easily with Spack 7
8 Traditional tools: binary package managers dpkg (APT), RPM, pacman, etc designed to manage a single stack install one version of each package in a single prefix (/usr) - root permission required seamless upgrades to a stable, well tested stack Florent Pruvost (SED) Install your scientific software stack easily with Spack 8
9 Traditional tools: port systems BSD Ports, portage, Macports, Homebrew, Gentoo, etc minimal support for builds parameterized by compilers, dependency versions Florent Pruvost (SED) Install your scientific software stack easily with Spack 9
10 Traditional tools: virtual machines and Linux containers Docker, etc containers allow users to build environments for different applications does not solve the build problem (someone has to build the image) performance, security, and upgrade issues prevent widespread HPC deployment Florent Pruvost (SED) Install your scientific software stack easily with Spack 10
11 Tools designed for scientific applications a short list to focus on: Nix/Guix, Easybuild, Spack Common features: - build from sources - own directory structure - hash parametrized by versions, dependencies, etc - no need to be root to install packages - usefull available packages: MPI, BLAS/LAPACK, FFTW, etc Differences: - robustness VS. flexibility - maturity - languages and technical details Florent Pruvost (SED) Install your scientific software stack easily with Spack 11
12 Nix/Guix: functional languages (Guile) pros: cons: - very precise dependency tracking - cryptographic hashes determine the exact build and run-time dependencies - safe upgrade - nice for reproducibility - administrator rights required to install Nix/Guix - limited to opensource softwares: no Intel, CUDA - deal with combinatorial builds? - multi-compiler and version support? - virtual dependency? - syntax for parametrization? Florent Pruvost (SED) Install your scientific software stack easily with Spack 12
13 Easybuild: Python pros: cons: - designed for installation on HPC systems - support for proprietary software like Intel and CUDA - can reuse what is already installed, cf. dummy toolchain - cannot deal with combinatorial builds - requires a file per configuration of a stack - limited command line interface Florent Pruvost (SED) Install your scientific software stack easily with Spack 13
14 Spack: Python 2 pros: cons: - deals with combinatorial builds - a couple of packages = thousands of builds available - nice command line syntax to tune the stack parameters - can reuse what is already installed, cf. config. files - no need to be root - no need to have internet access if tarballs are available locally - Spack is currently alpha software (young project) - package parameters changed a lot - new nice features = re-write packages - all parameters that affect a build are not controlled internally (external compilers and libraries) = all builds are not safe Florent Pruvost (SED) Install your scientific software stack easily with Spack 14
15 2Features overview Florent Pruvost (SED) Install your scientific software stack easily with Spack 15
16 Overview object-oriented Python 2 Unix systems - Windows is not an OS for HPC 500 available packages opensource, opencommunity (github - pull request) - Feb 10, Today - mainly developed by T. Gamblin and friends from LLNL - 95 contributors, 154 forks - 1 release every 6 months Florent Pruvost (SED) Install your scientific software stack easily with Spack 16
17 Overview Florent Pruvost (SED) Install your scientific software stack easily with Spack 16
18 Handles combinatorial software complexity each unique dependency graph is a unique configuration each configuration installed in a unique directory hash of DAG is appended to prefix installed packages automatically find dependencies - Spack embeds RPATHs in binaries (compiler wrappers) - no need to use modules or set LD LIBRARY PATH - things work the way you built them Florent Pruvost (SED) Install your scientific software stack easily with Spack 17
19 Provides a spec syntax to describe customized DAG configurations each expression is a spec for a particular configuration - each clause adds a constraint to the spec - constraints are optional specify only what you need - customize install on the command line! syntax abstracts details in the common case - makes parameterization by version, compiler, and options easy when necessary Florent Pruvost (SED) Install your scientific software stack easily with Spack 18
20 Spack Specs can constrain versions of dependencies Spack ensures one configuration of each library per DAG - consistency - user does not need to know DAG structure; only the dependency names Spack can ensure that builds use the same compiler, or you can mix - working on ensuring ABI compatibility when compilers are mixed Florent Pruvost (SED) Install your scientific software stack easily with Spack 19
21 Spack handles API-incompatibility mpi is a virtual dependency install the same package built with two different MPI implementations: let Spack choose MPI version, as long as it provides MPI-2 interface: Florent Pruvost (SED) Install your scientific software stack easily with Spack 20
22 Spack packages are simple Python scripts Florent Pruvost (SED) Install your scientific software stack easily with Spack 21
23 Dependencies may be optional versions can be tarballs or VCS repositories (git, svn, hg) the user can define named variants: and use them to install: $ spack install hwloc +cuda $ spack install hwloc -cuda dependencies may be optional according to other conditions: - e.g. gcc dependency on mpc from 4.5 on: Florent Pruvost (SED) Install your scientific software stack easily with Spack 22
24 Concretization fills in missing configuration details when the user is not explicit Florent Pruvost (SED) Install your scientific software stack easily with Spack 23
25 Default behaviours is configurable configure your preferred: - compilers, versions, depends on, variants directly in the package, e.g. prefers Python or for specific machine/environment, edit /.spack/packages.yaml Florent Pruvost (SED) Install your scientific software stack easily with Spack 24
26 Spack builds in isolated environment forking build process isolates environment for each build compiler wrappers add include, lib, and RPATH flags - ensure that dependencies are found automatically Florent Pruvost (SED) Install your scientific software stack easily with Spack 25
27 3 In practice Florent Pruvost (SED) Install your scientific software stack easily with Spack 26
28 Setup entry point on github: read the doc, at least Getting started: $ sudo apt install python $ git clone $. spack/share/spack/setup-env.sh $ spack install gcc Florent Pruvost (SED) Install your scientific software stack easily with Spack 27
29 Check compilers check compilers found automatically $ spack compiler list information about a compiler $ spack compiler info gcc Florent Pruvost (SED) Install your scientific software stack easily with Spack 28
30 Configure compilers add compilers installed in some exotic paths $ spack compiler find /home/jdoe/intel/bin remove non desired compilers $ spack compiler rm clang compiler configuration can be edited by hand $ vi ~/.spack/compilers.yaml Florent Pruvost (SED) Install your scientific software stack easily with Spack 29
31 Install list available packages $ spack list information about a package $ spack info hwloc check the concrete stack to be installed $ spack spec hwloc install a package $ spack install [-v] hwloc Florent Pruvost (SED) Install your scientific software stack easily with Spack 30
32 Configure the software stack constrained spec providers of virtual packages Florent Pruvost (SED) Install your scientific software stack easily with Spack 31
33 Look for installed packages look for all installed packages $ spack find find all installed configuration of a package $ spack find [-d p] hwloc~cuda location of an installation $ spack find -p hwloc~cuda%gcc $ spack location -i hwloc~cuda%gcc Florent Pruvost (SED) Install your scientific software stack easily with Spack 32
34 Uninstall + Install = update there is no update feature new variants or dependencies re-build the stack uninstall + re-install = update for the poors! $ spack uninstall [-yad] hwloc~cuda%gcc $ spack install hwloc~cuda%gcc Florent Pruvost (SED) Install your scientific software stack easily with Spack 33
35 Spack on a supercomputer no internet access in an HPC environment need to download the sources $ spack mirror create -d./mirror/ hwloc $ tar cvf mirror.tar.gz mirror copy tarballs on the remote machine $ scp mirror.tar.gz plafrim: on the machine, add the mirror directory to the Spack mirrors $ ssh plafrim $ tar xvf mirror.tar.gz $ spack mirror add local file:///home/pruvost/mirror Florent Pruvost (SED) Install your scientific software stack easily with Spack 34
36 Spack on a supercomputer softwares installed externally can be used, edit /.spack/packages.yaml Florent Pruvost (SED) Install your scientific software stack easily with Spack 35
37 4Some feedback Florent Pruvost (SED) Install your scientific software stack easily with Spack 36
38 Spack is more and more used Spack strengths: - helpfull when dealing with combinatorial stacks - user-friendly and highly configurable - flexible enough for HPC needs Spack is used in production at LLNL - build, test, and deployment by code teams - tools, libraries, and Python at Livermore Computing - build research projects for students, postdocs Spack has a rapidly growing external community - users and contributors at NERSC, Argonne/IIT, EPFL, U. Oregon, Sandia, LANL - Kitware contributing ParaView builds & features - INRIA (HiePACS) using Spack to package their linear solvers Florent Pruvost (SED) Install your scientific software stack easily with Spack 37
39 Spack weaknesses Spack current version is It is currently alpha software. It will remain so until it hits v1.0 packages change a lot re-build often builds are not fully guaranted - external programs: compilers and libraries - the build environment is not fully isolated and controlled problem for reproducibility in practice: fail often on new clusters high combinatorial = difficult to test all builds high flexibility = possibility to consider different DAGs/variants for one software stack non convergence of stack definitions between research teams? Florent Pruvost (SED) Install your scientific software stack easily with Spack 38
40 Thank you ANY QUESTIONS?
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