On Mon, 4 Apr 2016 12:59:38 -0700 (PDT)
display_name_taken <kenneth.kulathil...@gmail.com> wrote:

> I'm trying to find out what is the maximum number of repositories a
> given git server can handle or is there such a limit?
> For example can git server works without any issues if there are 1000 
> repositories? 
> Each repository will have only few files (10 or less) and the size of
> each repository will be few megabytes.

You maintain a wrong mental model about Git.

When you access a Git repository hosted on a server you either talk to
an SSH server or an HTTP server or the so-called Git daemon directly
(when a repository is being accessed using the URL beginning with
git://), but in either case, to access that repository a separate OS
process is started -- running one of the special low-level Git tools.

Hence *if* you're in the end using Git to serve your repositories, the
server's capaticy is more about handling the desired number of
simultaneously run processes each potentially using a hefty amount of
memory (big fetches for instance).  Disk throughput might also
potentially become a bottleneck.

On the other hand, here we're talking about concurrent access.
I'm pretty sure that to really have 1000 clients concurrently cloning
big repositories, you'd have to have some x100 as much repositories
because IMO having such "thundering herd" spikes, when all the clients
potential clients all of a sudden start cloning their repositories is
pretty much unlikely -- unless you're being DOSed.

In either case, what's the point in such "guesseneering"?
Have a test server and simulate the desired workload.

If you're about hosting that much repositories you should not be
pulling the sample data out of anectotes heard on some public forums.

Oh, and while we're at it: the model I outlined -- one specialized Git
process serving a single client accessing a single repository -- is,
again, when you're using plain vanilla Git for serving (plus some
front-end may be, such as SSH or HTTP server).  If you're using a
solution which does not use plain Git (such as Gitblit), the situation
may be very different.

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