Warn when the pre-test init time becomes much slower than a worker restart - #183
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christiangnrd
added this pull request to stack #184
September 11, 2026 13:03
…start Under macOS memory pressure (issue #124), the full GC run before each test gets progressively slower on a long-lived worker, which is usually a sign that there are too many workers for the available memory and can lead to hangs or much longer test times. Track the init time of tests run on freshly spawned workers (which already includes spawn, init_worker_code and init_code, so it is the full cost of a restart) and, once a warm init exceeds SLOW_INIT_FACTOR times that, print a warning (once per run) suggesting to lower JULIA_TEST_MAXRSS_MB / max_worker_rss or the number of jobs. A testset forces a slow init to check the warning. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Would love feedback on how to communicate this.
Current:
Maybe we should give the warning and link to a docs section instead?