Add --debug-stats mode for runtime performance analysis#632
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stephenamar-db merged 1 commit intomasterfrom Mar 4, 2026
Merged
Add --debug-stats mode for runtime performance analysis#632stephenamar-db merged 1 commit intomasterfrom
stephenamar-db merged 1 commit intomasterfrom
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Introduces a --debug-stats CLI flag that prints counters and timing to stderr after evaluation: lazy creation counts, function/builtin call counts, comprehension iterations, unique import counts (with cache hit tracking), per-phase timing (parse, eval, materialize), and JVM heap usage. Counters use stable snake_case labels for machine parsing. The DebugStats class is threaded through Interpreter -> Evaluator with null-check guards so there is zero overhead when the flag is not set. Parse counting/timing is handled by CountingParseCache wrapping the existing ParseCache.
He-Pin
reviewed
Mar 5, 2026
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| # Check formatting without changing files | ||
| ./mill __.checkFormat | ||
| ``` |
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User can install scalafmt native too, which should be faster.
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Introduces a --debug-stats CLI flag that prints counters and timing to stderr after evaluation: lazy creation counts, function/builtin call counts, comprehension iterations, unique import counts (with cache hit tracking), per-phase timing (parse, eval, materialize), and JVM heap usage. Counters use stable snake_case labels for machine parsing.
The DebugStats class is threaded through Interpreter -> Evaluator with null-check guards so there is zero overhead when the flag is not set. Parse counting/timing is handled by CountingParseCache wrapping the existing ParseCache.