Ayaz Hafiz (Jul 05 2023 at 16:20): Ayaz Hafiz (Jul 05 2023 at 16:20):In a somewhat surprising result, type-erasing functions instead of using lambda sets is only ~10% faster for type checking
❯ hyperfine 'target/release/roc check examples/cli/args.roc' '../roc2/target/release/roc check examples/cli/args.roc' --warmup 20
Benchmark 1: target/release/roc check examples/cli/args.roc
Time (mean ± σ): 38.4 ms ± 1.0 ms [User: 59.8 ms, System: 15.3 ms]
Range (min … max): 36.9 ms … 44.2 ms 68 runs
Benchmark 2: ../roc2/target/release/roc check examples/cli/args.roc
Time (mean ± σ): 41.8 ms ± 0.8 ms [User: 67.2 ms, System: 15.8 ms]
Range (min … max): 40.0 ms … 44.7 ms 65 runs
Summary
'target/release/roc check examples/cli/args.roc' ran
1.09 ± 0.04 times faster than '../roc2/target/release/roc check examples/cli/args.roc'
that's fine because this is not an explicit goal of type erasure, but an interesting observation
Brendan Hansknecht (Jul 05 2023 at 16:31):Is this a case of other steps being most of the time or are lambda sets most of the cost here?
Ayaz Hafiz (Jul 05 2023 at 16:33):this is an example where i expected lambda sets to consume the most time, but i guess they only take 10% of the time relative to parsing, etc.
Ayaz Hafiz (Jul 05 2023 at 16:33):in any case the boost is nice but I don't think it matters too much anyway, anything sub 100ms is excellent IMO
Last updated: Jul 26 2025 at 12:14 UTC