This page is for developers
who want to work on the internals of Open MPI itself.
If you are a
general user or system administrator looking to simply download
and install Open MPI, please
Because the Open MPI Team tries very hard to release stable and
as-bug-free-as-possible distributions, we tend to take a long time
between major releases. However, there are many useful new features
(and bug fixes) in our internal Git tree that some users have
asked for access to. Additionally, for those who are actually developing
the internals of Open MPI, Git access gives the most
up-to-date versions rather than the periodic tarball access. As such,
the Open MPI Team has decided to provide read-only access to the Open
MPI Git tree.
Be aware, however, that the head of the development code tree is
not guaranteed to be stable. For the most part, we try very
hard to not commit things that are broken, but this is an active
development tree — bugs happen. This is actually another major
reason that this tree has been made available: peer review. If you
find any bugs, please report them! Contributions,
suggestions, and comments are welcome.
The Git "main" branch is the current development version of
Open MPI. It is generally where new Open MPI work is done.
There are multiple ways to get access to Open MPI's source code:
- Clone the main Open
MPI Git repo at GitHub. The main development work occurs on the
"main" branch in this repo.
Advantage: You'll easily be
able to keep up with the latest source code using normal Git
commands (e.g., '
git pull --rebase --recurse-submodules').
Disadvantage: You need to have
several tools installed to compile Open
MPI from a developer checkout.
- Download a nightly
snapshot tarball. Then see the Building Open MPI
section of the FAQ for instructions on how to build and install
Advantage: You need no
extra tools to compile and install Open MPI.
Disdvantage: You cannot easily
keep up with the latest source code; you'll need to download a new
tarball each time you want to update.
NOTE: Prior to October
2014, Open MPI was maintained in a Subversion repository. This
Subversion repository had two read-only mirrors: a Mercurial mirror at
bitbucket.org and a Git mirror at github.com. These two mirrors
are now defunct and will no longer be updated. If you
are using either of these mirrors, you should stop using them and
switch to the main Open MPI Git repository at GitHub.