Re: s390x builder outage

On Sat, Aug 15, 2026 at 11:22 PM Neal Gompa <[email protected]> wrote:
>
> On Sat, Aug 15, 2026 at 5:09 PM Fabio Valentini <[email protected]> wrote:
> >
> > On Sat, Aug 15, 2026 at 4:38 PM Chris Adams <[email protected]> wrote:
> > >
> > > Once upon a time, Fabio Valentini <[email protected]> said:
> > > > When there are idle builders available, then ppc64le builders appear
> > > > to be slightly slower than s390x.
> > > > But when all s390x builders are busy, they become the bottleneck, both
> > > > in terms of wait time (time until a build is assigned to an s390x
> > > > builder) *and* build time (more builds running on the same hardware?).
> > >
> > > That sounds like maybe too many parallel builds are being sent to the
> > > same hardware, which I would think would be easy to adjust.
> >
> > Not really, no ... provisioning fewer builders to the same hardware
> > just makes the bottleneck worse (fewer builders available). From what
> > I can tell, the current setup (number of builders / available
> > hardware) is pretty much the best that can be done - without actually
> > getting more hardware.
> >
>
> To make it clear, we have a shortage of hardware for *both*
> architectures. But IBM Z impairs us significantly more than POWER
> does.

It might also be worth noting that s390x is *already* kind of a
second-tier architecture:

- noarch builds are never scheduled to run on s390x
- SRPM builds are never scheduled to run on s390x
- koschei scratch builds always exclude s390x

So it's this bad *even with* all these restrictions to reduce s390x
usage in place.

Fabio
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