ci: Split miri tests into 4 parallel shards#10067
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The longest partition seems to take around 19 minutes (down from 57), we can make it even faster using this method. |
Dandandan
approved these changes
Jun 6, 2026
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Which issue does this PR close?
Rationale for this change
Miri currently takes just under an hour to run, with most of it being the actual tests.
What changes are included in this PR?
This PR modifies the script that runs miri to optionally use nextest's partitioning feature, and makes use of it in CI with 4 partitions. This should reduce the overall miri runtime to just over 15 minutes with a minimal increase in CI resource usage.
This is also scalable if the number of tests keeps increasing, changing the number of partitions is trivial, picking 4 here is an arbitrary choice.
Are these changes tested?
Tested the script locally.
Are there any user-facing changes?
No