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to avoid getting OOM killed. We need to have a high number of GitHub Actions runners simultaneously active, otherwise the hardware ends up underutilized. But with zig build running in parallel now, this sometimes results in memory usage spikes that have been causing the runner to get killed. This number is the total physical memory (251G) divided by the number of runners we have active (11). See related commit 2d41dac57d3afdd5fe3d03be08ff0a24833f61dd which did the same but for our x86_64-linux machines.