Does anyone have any guidance on running multiple VMs for CI on a single Mac mini? If I run two side-by-side, it's so slow as to be unusable - I'm looking for advice on memory setup, core counts, etc.
@tonyarnold Have not noticed contention, it’s been very reliable. Note that we run this to build packages of the Swift Package Index and they have a hard build timeout after 10mins. However we really hammer this machine: each VM runs two parallel builds.
We do this, because a lot of time is spent checking out the repo and prepping the build. I.e. without scheduling 2 builds in each VM we underutilise the host.
@tonyarnold Looks like I overprovisioned on CPU on our sonoma images as well - to no ill effect:
➜ ~ tart get ventura-base-5.7
CPU Memory Disk Display State
4 16000 131 1024x768 running
➜ ~ tart get ventura-base-5.8
CPU Memory Disk Display State
4 16000 140 1024x768 running
➜ ~ tart get sonoma-5.9-a
CPU Memory Disk Display State
8 16000 326 1024x768 stopped
➜ ~ tart get sonoma-5.9-b
CPU Memory Disk Display State
8 16000 278 1024x768 stopped
@tonyarnold We rotate runners depending on demand, that's why the Sonoma runners are currently stopped. We ran them very hot when we ran the first two batches of Swift 6 preview testing (7.2k builds each) on them and they held up perfectly.
They handled most of the load with only one other non-VM Mac handling Swift 6 builds.
@tonyarnold Subscribe, been looking into this a bit for work recently. We’ve a tonne of racked m2 minis that I’d love a couple VMs on but not quite sure how they’ll cope.
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