222f551c37
- Locks now use fcntl range locks on a single file. How it works for prefixes: - Each lock is a byte range lock on the nth byte of a file. - The lock file is ``spack.installed_db.prefix_lock`` -- the DB tells us what to call it and it lives alongside the install DB. n is the sys.maxsize-bit prefix of the DAG hash. For stages, we take the sha1 of the stage name and use that to select a byte to lock. With 100 concurrent builds, the likelihood of a false lock collision is ~5.36e-16, so this scheme should retain more than sufficient paralellism (with no chance of false negatives), and get us reader-writer lock semantics with a single file, so no need to clean up lots of lock files. |
||
|---|---|---|
| bin | ||
| etc/spack/defaults | ||
| lib/spack | ||
| share/spack | ||
| var/spack | ||
| .coveragerc | ||
| .flake8 | ||
| .gitignore | ||
| .mailmap | ||
| .travis.yml | ||
| LICENSE | ||
| README.md | ||
Spack is a package management tool designed to support multiple versions and configurations of software on a wide variety of platforms and environments. It was designed for large supercomputing centers, where many users and application teams share common installations of software on clusters with exotic architectures, using libraries that do not have a standard ABI. Spack is non-destructive: installing a new version does not break existing installations, so many configurations can coexist on the same system.
Most importantly, Spack is simple. It offers a simple spec syntax so that users can specify versions and configuration options concisely. Spack is also simple for package authors: package files are written in pure Python, and specs allow package authors to write a single build script for many different builds of the same package.
See the Feature Overview for examples and highlights.
To install spack and install your first package:
$ git clone https://github.com/llnl/spack.git
$ cd spack/bin
$ ./spack install libelf
Documentation
Full documentation for Spack is the first place to look.
See also:
- Technical paper and slides on Spack's design and implementation.
- Short presentation from the Getting Scientific Software Installed BOF session at Supercomputing 2015.
Get Involved!
Spack is an open source project. Questions, discussion, and contributions are welcome. Contributions can be anything from new packages to bugfixes, or even new core features.
Mailing list
If you are interested in contributing to spack, the first step is to join the mailing list. We're using a Google Group for this, and you can join it here:
Contributions
Contributing to Spack is relatively easy. Just send us a
pull request.
When you send your request, make develop the destination branch on the
Spack repository.
Before you send a PR, your code should pass the following checks:
-
Your contribution will need to pass the
spack testcommand. Run this before submitting your PR. -
Also run the
share/spack/qa/run-flake8-testsscript to check for PEP8 compliance. To encourage contributions and readability by a broad audience, Spack uses the PEP8 coding standard with a few exceptions.
We enforce these guidelines with Travis CI.
Spack uses a rough approximation of the Git
Flow
branching model. The develop branch contains the latest
contributions, and master is always tagged and points to the
latest stable release.
Authors
Many thanks go to Spack's contributors.
Spack was originally written by Todd Gamblin, tgamblin@llnl.gov.
Citing Spack
If you are referencing Spack in a publication, please cite the following paper:
- Todd Gamblin, Matthew P. LeGendre, Michael R. Collette, Gregory L. Lee, Adam Moody, Bronis R. de Supinski, and W. Scott Futral. The Spack Package Manager: Bringing Order to HPC Software Chaos. In Supercomputing 2015 (SC’15), Austin, Texas, November 15-20 2015. LLNL-CONF-669890.
Release
Spack is released under an LGPL license. For more details see the LICENSE file.
LLNL-CODE-647188