Programming Language and compiler
Benchmarks

OCaml VS Rust benchmarks

Current benchmark data was generated on Sat Mar 29 2025, full log can be found HERE

CONTRIBUTIONS are WELCOME!

[x86_64][4 cores] AMD EPYC 7763 64-Core Processor (Model 1)

* -m in a file name stands for multi-threading or multi-processing

* -i in a file name stands for direct intrinsics usage. (Usage of simd intrinsics via libraries is not counted)

* -ffi in a file name stands for non-stdlib FFI usage

* (You may find time < time(user) + time(sys) for some non-parallelized programs, the overhead is from GC or JIT compiler, which are allowed to take advantage of multi-cores as that's more close to real-world scenarios.)

binarytrees

Input: 18

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 4.rs 1269ms 5.9ms 33.6MB 1247ms 7ms rustc 1.85.1
rust 5.rs 1360ms 8.5ms 33.8MB 1333ms 10ms rustc 1.85.1
rust 3.rs 1472ms 50ms 49.8MB 1440ms 17ms rustc 1.85.1
ocaml 1.ml 3076ms 70ms 157.2MB 2993ms 73ms ocaml 5.3.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 4.rs 120ms 2.2ms 5.6MB 110ms 0ms rustc 1.85.1
rust 5.rs 126ms 3.7ms 5.8MB 113ms 0ms rustc 1.85.1
rust 3.rs 142ms 3.8ms 7.8MB 130ms 0ms rustc 1.85.1
ocaml 1.ml 223ms 5.5ms 19.1MB 203ms 3ms ocaml 5.3.0

fannkuch-redux

Input: 11

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 3-im.rs 412ms 3.0ms 2.0MB 1580ms 0ms rustc 1.85.1
rust 5-m.rs 597ms 46ms 2.0MB 2177ms 0ms rustc 1.85.1
rust 2-im.rs 631ms 4.2ms 2.0MB 2423ms 0ms rustc 1.85.1
rust 1-m.rs 986ms 25ms 2.1MB 3787ms 0ms rustc 1.85.1
rust 3-i.rs 1506ms 13ms 1.9MB 1497ms 0ms rustc 1.85.1
rust 2-i.rs 1758ms 0.6ms 1.8MB 1750ms 0ms rustc 1.85.1
rust 1.rs 2692ms 6.5ms 1.8MB 2683ms 0ms rustc 1.85.1
ocaml 2.ml 2920ms 14ms 4.9MB 2910ms 0ms ocaml 5.3.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 3-im.rs 38ms 0.2ms 2.0MB 127ms 0ms rustc 1.85.1
rust 5-m.rs 53ms 1.0ms 2.0MB 173ms 0ms rustc 1.85.1
rust 2-im.rs 60ms 0.3ms 2.0MB 200ms 0ms rustc 1.85.1
rust 1-m.rs 87ms 0.9ms 2.0MB 307ms 0ms rustc 1.85.1
rust 3-i.rs 125ms 0.4ms 1.9MB 120ms 0ms rustc 1.85.1
rust 2-i.rs 150ms 0.6ms 1.8MB 140ms 0ms rustc 1.85.1
rust 1.rs 227ms 2.5ms 1.8MB 217ms 0ms rustc 1.85.1
ocaml 2.ml 246ms 2.4ms 4.9MB 237ms 0ms ocaml 5.3.0

fasta

Input: 2500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 5c-m.rs 92ms 2.8ms 3.2MB 263ms 0ms rustc 1.85.1
rust 5-m.rs 93ms 0.6ms 3.2MB 293ms 0ms rustc 1.85.1
rust 1c.rs 163ms 0.3ms 1.8MB 150ms 0ms rustc 1.85.1
rust 1.rs 196ms 0.7ms 1.9MB 190ms 0ms rustc 1.85.1
ocaml 6.ml 347ms 0.6ms 24.8MB 333ms 0ms ocaml 5.3.0

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 5c-m.rs 17ms 0.2ms 3.2MB 23ms 0ms rustc 1.85.1
rust 5-m.rs 17ms 0.5ms 3.4MB 30ms 0ms rustc 1.85.1
rust 1c.rs 19ms 0.1ms 1.9MB 10ms 0ms rustc 1.85.1
rust 1.rs 22ms 0.6ms 1.9MB 10ms 0ms rustc 1.85.1
ocaml 6.ml 39ms 0.3ms 7.3MB 30ms 0ms ocaml 5.3.0

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 1.rs 1.2ms 0.0ms 1.8MB 0ms 0ms rustc 1.85.1
rust 1.rs 1.3ms 0.1ms 1.8MB 0ms 0ms rustc 1.87.0-nightly
ocaml 1.ml 1.9ms 0.1ms 5.0MB 0ms 0ms ocaml 5.3.0

lru

Input: 1000 1000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 0-unsafe.rs 36ms 2.8ms 1.8MB 27ms 0ms rustc 1.85.1
rust 1.rs 52ms 14ms 1.9MB 43ms 0ms rustc 1.85.1
ocaml 1.ml 185ms 5.6ms 6.4MB 173ms 0ms ocaml 5.3.0

Input: 1000 3000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 0-unsafe.rs 137ms 7.5ms 1.9MB 130ms 0ms rustc 1.85.1
rust 1.rs 189ms 17ms 2.0MB 180ms 0ms rustc 1.85.1
ocaml 1.ml 537ms 16ms 6.6MB 527ms 0ms ocaml 5.3.0

Input: 100 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 0-unsafe.rs 23ms 0.6ms 1.8MB 17ms 0ms rustc 1.85.1
rust 1.rs 33ms 3.2ms 1.9MB 23ms 0ms rustc 1.85.1
ocaml 1.ml 76ms 0.7ms 5.9MB 70ms 0ms ocaml 5.3.0

merkletrees

Input: 17

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 1.rs 717ms 11ms 33.8MB 693ms 10ms rustc 1.85.1
ocaml 1.ml 1097ms 8.4ms 70.3MB 1057ms 30ms ocaml 5.3.0
ocaml 2.ml 2087ms 30ms 91.7MB 2037ms 33ms ocaml 5.3.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 1.ml 149ms 1.0ms 21.7MB 133ms 7ms ocaml 5.3.0
rust 1.rs 151ms 0.9ms 9.8MB 140ms 0ms rustc 1.85.1
ocaml 2.ml 362ms 2.4ms 27.7MB 343ms 3ms ocaml 5.3.0

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 4-i.rs 164ms 0.4ms 1.9MB 157ms 0ms rustc 1.85.1
rust 7-i.rs 239ms 0.8ms 1.8MB 230ms 0ms rustc 1.85.1
rust 1.rs 240ms 0.7ms 1.8MB 230ms 0ms rustc 1.85.1
rust 3.rs 279ms 0.7ms 1.9MB 270ms 0ms rustc 1.87.0-nightly
rust 2.rs 280ms 0.4ms 1.8MB 270ms 0ms rustc 1.85.1
ocaml 1.ml 377ms 1.5ms 5.3MB 367ms 0ms ocaml 5.3.0

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 4-i.rs 18ms 0.3ms 1.9MB 10ms 0ms rustc 1.85.1
rust 7-i.rs 26ms 0.2ms 1.9MB 20ms 0ms rustc 1.85.1
rust 1.rs 26ms 0.3ms 1.8MB 20ms 0ms rustc 1.85.1
rust 3.rs 30ms 0.2ms 1.8MB 20ms 0ms rustc 1.87.0-nightly
rust 2.rs 31ms 0.8ms 1.6MB 20ms 0ms rustc 1.85.1
ocaml 1.ml 40ms 1.1ms 5.2MB 30ms 0ms ocaml 5.3.0

nsieve

Input: 12

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 2.rs 311ms 3.4ms 6.6MB 300ms 0ms rustc 1.85.1
rust 1.rs 351ms 9.0ms 40.9MB 333ms 0ms rustc 1.85.1
ocaml 1.ml 961ms 7.1ms 552.4MB 900ms 47ms ocaml 5.3.0
ocaml 2.ml 1888ms 3.0ms 18.9MB 1877ms 0ms ocaml 5.3.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 1.rs 74ms 3.7ms 11.6MB 63ms 0ms rustc 1.85.1
rust 2.rs 78ms 0.1ms 2.9MB 70ms 0ms rustc 1.85.1
ocaml 1.ml 191ms 10ms 142.3MB 167ms 10ms ocaml 5.3.0
ocaml 2.ml 465ms 0.7ms 9.1MB 457ms 0ms ocaml 5.3.0

regex-redux

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 7.rs 439ms 2.1ms 77.6MB 443ms 17ms rustc 1.85.1
ocaml 2.ml timeout 0.0ms 474.1MB 4813ms 173ms ocaml 5.3.0

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 7.rs 49ms 1.3ms 12.6MB 43ms 0ms rustc 1.85.1
ocaml 2.ml 550ms 3.3ms 57.1MB 517ms 20ms ocaml 5.3.0

spectral-norm

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 8-m.rs 498ms 6.0ms 2.5MB 1880ms 7ms rustc 1.87.0-nightly
rust 7-m.rs 504ms 3.9ms 2.3MB 1930ms 0ms rustc 1.85.1
rust 8.rs 993ms 0.8ms 2.4MB 983ms 0ms rustc 1.87.0-nightly
rust 2-m.rs 1969ms 2.9ms 2.1MB 7700ms 13ms rustc 1.85.1
rust 7.rs 2108ms 1.5ms 2.0MB 2100ms 0ms rustc 1.85.1
rust 2.rs 4215ms 2.7ms 2.0MB 4207ms 0ms rustc 1.85.1
ocaml 2.ml 4568ms 13ms 6.4MB 4557ms 0ms ocaml 5.3.0

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 8-m.rs 128ms 0.6ms 2.4MB 463ms 3ms rustc 1.87.0-nightly
rust 7-m.rs 130ms 0.5ms 2.1MB 477ms 0ms rustc 1.85.1
rust 8.rs 251ms 0.4ms 2.1MB 240ms 0ms rustc 1.87.0-nightly
rust 2-m.rs 496ms 0.9ms 2.1MB 1913ms 3ms rustc 1.85.1
rust 7.rs 531ms 2.6ms 1.9MB 523ms 0ms rustc 1.85.1
rust 2.rs 1056ms 1.3ms 1.9MB 1050ms 0ms rustc 1.85.1
ocaml 2.ml 1153ms 6.9ms 6.1MB 1143ms 0ms ocaml 5.3.0

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 7-m.rs 36ms 0.5ms 2.1MB 107ms 3ms rustc 1.85.1
rust 8-m.rs 36ms 0.4ms 2.1MB 107ms 3ms rustc 1.87.0-nightly
rust 8.rs 66ms 0.5ms 2.0MB 60ms 0ms rustc 1.87.0-nightly
rust 2-m.rs 129ms 0.7ms 2.1MB 467ms 0ms rustc 1.85.1
rust 7.rs 139ms 5.6ms 1.9MB 133ms 0ms rustc 1.85.1
rust 2.rs 266ms 0.4ms 2.0MB 260ms 0ms rustc 1.85.1
ocaml 2.ml 290ms 2.8ms 5.2MB 280ms 0ms ocaml 5.3.0