Re: [Libguestfs] [nbdkit PATCH] RFC: blocksize: Add test for sharding behavior
On Thu, May 26, 2022 at 09:58:50AM +0100, Richard W.M. Jones wrote:
Is there any way to do this without the literal sleeps? Gitlab CI in
particular appears to be very contended (I guess it runs in parallel
on huge systems with vast numbers of unrelated containers). I've seen
threads being created that are so starved they never run at all even
in tests running for many tens of seconds.
IIUC, GitLab uses GCE "spot" VMs for its shared runners
https://cloud.google.com/compute/docs/instances/spot
TL;DR; these are massively cheaper than normal VMs (60-91% cheaper),
but GCE might pre-empt the VM if it needs to reclaim resources for
more important VMs on the host.
IOW, we have to expect a (usually low level) of non-determinsitic
failures and stalls from the CI jobs using shared runners, and
be willing to hit the restart job button if a problem occurs.
With regards,
Daniel
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