Saml support should be pretty good, it was contributed by CERN and they use it in production. Please see http://doc.gitlab.com/ce/integration/saml.html for documentation. If you encounter a bug please create an issue on https://gitlab.com/gitlab-org/gitlab-ce/issues
We will try to reduce memory usage by something like 20% in the coming year. We have package for the Raspberry Pi 2 if you're into that. But GitLab will always be large due to its many features. For more details see https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/inst... If you want something with minimal requirements I recommend Gogs https://gogs.io/
(installation instructions) https://about.gitlab.com/downloads/#raspberrypi2
(original blog post) https://about.gitlab.com/2015/04/21/gitlab-on-raspberry-pi-2...
I run our Shibboleth IDP among other things, and I was told by the team that was looking at GitLab at the time that it was impossible to tie it in with the currently available SAML SP plugins. This was over a year ago, maybe things have improved...
Other (unrelated) minor things:
- SAML support exists, but at last check was mostly broken. Universities in particular use SAML over OAuth (See http://www.incommonfederation.org/participants/)
- Resource usage seems very high for small shops; will there be a GitLab "lite"? ...would be especially awesome if it didn't need a mostly dedicated container and could drop in as a subfolder of an existing site (with minimal resource requirements).