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commit b8a2299fe4f688c2b7b022dc694f063450ab0edb Author: Nick Vatamaniuc <[email protected]> AuthorDate: Thu Apr 16 18:07:43 2026 -0400 Reduce bytes per reduction a bit A scheduling benchmark test showed we had too high p99 and max values compared with the built-in OTP 27 json Before ===== ``` [jiffy] idle (no workers) n=2489 p50=997us p95=1.1ms p99=1.2ms max=11.5ms 12x decode n=1679 p50=1.5ms p95=4.4ms p99=10.7ms max=76.7ms 12x encode n=1148 p50=2.8ms p95=7.8ms p99=12.6ms max=32.2ms 24x decode n=1187 p50=2.4ms p95=8.3ms p99=13.9ms max=72.2ms 24x encode n=754 p50=5.0ms p95=10.7ms p99=16.8ms max=30.0ms 48x decode n=750 p50=4.0ms p95=13.8ms p99=27.6ms max=58.7ms 48x encode n=137 p50=35.7ms p95=68.7ms p99=92.4ms max=102.0ms [json] idle (no workers) n=2500 p50=997us p95=1.1ms p99=1.2ms max=1.7ms 12x decode n=2008 p50=1.0ms p95=3.7ms p99=10.5ms max=50.1ms 12x encode n=1977 p50=1.0ms p95=4.9ms p99=10.3ms max=26.0ms 24x decode n=2173 p50=1.0ms p95=2.8ms p99=5.5ms max=23.8ms 24x encode n=1850 p50=1.1ms p95=5.1ms p99=8.7ms max=67.4ms 48x decode n=1596 p50=1.9ms p95=4.7ms p99=9.3ms max=21.0ms 48x encode n=1698 p50=1.2ms p95=6.2ms p99=11.5ms max=32.9ms ``` After ==== ``` [jiffy] idle (no workers) n=2500 p50=998us p95=1.1ms p99=1.2ms max=1.3ms 12x decode n=2302 p50=1.1ms p95=2.0ms p99=3.2ms max=17.0ms 12x encode n=1703 p50=1.8ms p95=3.4ms p99=5.1ms max=11.5ms 24x decode n=1872 p50=1.4ms p95=3.5ms p99=5.2ms max=9.5ms 24x encode n=1183 p50=2.9ms p95=6.1ms p99=10.4ms max=16.7ms [json] idle (no workers) n=2500 p50=998us p95=1.1ms p99=1.2ms max=2.2ms 12x decode n=2354 p50=1.0ms p95=1.8ms p99=4.0ms max=12.1ms 12x encode n=2239 p50=993us p95=3.1ms p99=5.7ms max=13.5ms 24x decode n=2216 p50=1.0ms p95=2.4ms p99=6.0ms max=15.0ms 24x encode n=2155 p50=1.0ms p95=3.3ms p99=6.8ms max=14.2ms ``` --- c_src/jiffy.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/c_src/jiffy.h b/c_src/jiffy.h index 082b62c..68dcb90 100644 --- a/c_src/jiffy.h +++ b/c_src/jiffy.h @@ -6,7 +6,7 @@ #include "erl_nif.h" -#define DEFAULT_BYTES_PER_REDUCTION 20 +#define DEFAULT_BYTES_PER_REDUCTION 10 // This used to be 2000 and in 19.2 was bumped to 4000 // #define CONTEXT_REDS in erts/emulator/beam/erl_vm.h
