Re: Serious doubts about Gitlab CI

[Paolo Bonzini]

On 19/03/21 10:33, Stefan Hajnoczi wrote:
> On Thu, Mar 18, 2021 at 09:30:41PM +0100, Paolo Bonzini wrote:
> > On 18/03/21 20:46, Stefan Hajnoczi wrote:
> > > The QEMU Project has 50,000 minutes of GitLab CI quota. Let's enable
> > > GitLab Merge Requests so that anyone can submit a merge request and get
> > > CI coverage.
> >
> > Each merge request consumes about 2500.  That won't last long.
>
> Yikes, that is 41 hours per CI run. I wonder if GitLab's CI minutes are
> on slow machines or if we'll hit the same issue with dedicated runners.
> It seems like CI optimization will be necessary...

Shared runners are 1 vCPU, so it's really 41 CPU hours per CI run. 
That's a lot but not unheard of.

Almost every 2-socket server these days will have at least 50 CPUs; with 
some optimization we probably can get it down to half an hour of real 
time, on a single server running 3-4 runners with 16 vCPUs.

Paolo