Programming Language and compiler
Benchmarks

OCaml VS Rust benchmarks

Current benchmark data was generated on Mon Jun 23 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 1281ms 3.7ms 33.6MB 1260ms 10ms rustc 1.87.0
rust 5.rs 1360ms 12ms 33.8MB 1337ms 7ms rustc 1.87.0
rust 3.rs 1485ms 57ms 49.8MB 1453ms 17ms rustc 1.87.0
ocaml 1.ml 3028ms 44ms 157.2MB 2940ms 73ms ocaml 5.3.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 4.rs 124ms 2.4ms 5.8MB 113ms 0ms rustc 1.87.0
rust 5.rs 127ms 3.7ms 5.8MB 117ms 0ms rustc 1.87.0
rust 3.rs 138ms 7.0ms 7.8MB 127ms 0ms rustc 1.87.0
ocaml 1.ml 214ms 0.9ms 19.1MB 200ms 0ms 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 1.0ms 2.1MB 1587ms 0ms rustc 1.87.0
rust 5-m.rs 558ms 5.3ms 2.1MB 2150ms 0ms rustc 1.87.0
rust 2-im.rs 666ms 4.7ms 2.0MB 2570ms 0ms rustc 1.87.0
rust 1-m.rs 959ms 43ms 2.1MB 3667ms 0ms rustc 1.87.0
rust 3-i.rs 1498ms 0.7ms 1.8MB 1490ms 0ms rustc 1.87.0
rust 2-i.rs 2345ms 0.3ms 1.8MB 2337ms 0ms rustc 1.87.0
rust 1.rs 2722ms 8.7ms 1.8MB 2713ms 0ms rustc 1.87.0
ocaml 2.ml 2914ms 16ms 4.9MB 2907ms 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 0.4ms 2.0MB 123ms 0ms rustc 1.87.0
rust 5-m.rs 52ms 0.7ms 2.1MB 170ms 0ms rustc 1.87.0
rust 2-im.rs 61ms 2.1ms 2.1MB 207ms 0ms rustc 1.87.0
rust 1-m.rs 82ms 1.9ms 2.1MB 290ms 0ms rustc 1.87.0
rust 3-i.rs 125ms 0.7ms 1.9MB 120ms 0ms rustc 1.87.0
rust 2-i.rs 193ms 0.3ms 1.8MB 183ms 0ms rustc 1.87.0
rust 1.rs 225ms 2.5ms 1.8MB 217ms 0ms rustc 1.87.0
ocaml 2.ml 245ms 3.3ms 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 89ms 0.4ms 3.4MB 260ms 0ms rustc 1.87.0
rust 6.rs 89ms 0.5ms 1.9MB 80ms 0ms rustc 1.87.0
rust 5-m.rs 94ms 0.8ms 3.2MB 293ms 0ms rustc 1.87.0
rust 1c.rs 162ms 0.5ms 1.9MB 150ms 0ms rustc 1.87.0
rust 1.rs 196ms 1.0ms 1.9MB 190ms 0ms rustc 1.87.0
ocaml 6.ml 347ms 1.7ms 24.8MB 337ms 0ms ocaml 5.3.0

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 6.rs 12ms 1.2ms 1.9MB 10ms 0ms rustc 1.87.0
rust 5c-m.rs 16ms 0.5ms 3.2MB 27ms 0ms rustc 1.87.0
rust 5-m.rs 17ms 0.5ms 3.2MB 30ms 0ms rustc 1.87.0
rust 1c.rs 19ms 0.3ms 1.9MB 10ms 0ms rustc 1.87.0
rust 1.rs 22ms 0.4ms 2.0MB 10ms 0ms rustc 1.87.0
ocaml 6.ml 39ms 0.5ms 7.5MB 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 0.1ms 1.8MB 0ms 0ms rustc 1.87.0
rust 1.rs 1.2ms 0.0ms 1.8MB 0ms 0ms rustc 1.89.0-nightly
ocaml 1.ml 1.8ms 0.2ms 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 35ms 5.1ms 1.9MB 27ms 0ms rustc 1.87.0
rust 1.rs 49ms 4.1ms 1.9MB 43ms 0ms rustc 1.87.0
ocaml 1.ml 190ms 0.6ms 6.4MB 180ms 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 143ms 28ms 1.8MB 133ms 0ms rustc 1.87.0
rust 1.rs 175ms 13ms 1.9MB 167ms 0ms rustc 1.87.0
ocaml 1.ml 518ms 3.2ms 6.6MB 510ms 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 24ms 2.0ms 1.8MB 17ms 0ms rustc 1.87.0
rust 1.rs 29ms 0.5ms 1.8MB 20ms 0ms rustc 1.87.0
ocaml 1.ml 77ms 1.4ms 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 708ms 3.5ms 33.8MB 683ms 10ms rustc 1.87.0
ocaml 1.ml 1094ms 11ms 70.2MB 1047ms 30ms ocaml 5.3.0
ocaml 2.ml 2066ms 16ms 91.8MB 2013ms 33ms ocaml 5.3.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 1.ml 147ms 4.1ms 21.7MB 130ms 7ms ocaml 5.3.0
rust 1.rs 151ms 2.0ms 9.8MB 140ms 0ms rustc 1.87.0
ocaml 2.ml 367ms 7.6ms 27.7MB 343ms 7ms 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 0.9ms 1.9MB 160ms 0ms rustc 1.87.0
rust 7-i.rs 219ms 0.9ms 1.8MB 210ms 0ms rustc 1.87.0
rust 1.rs 230ms 0.5ms 1.9MB 220ms 0ms rustc 1.87.0
rust 3.rs 279ms 0.3ms 1.9MB 270ms 0ms rustc 1.89.0-nightly
rust 2.rs 279ms 0.6ms 1.8MB 270ms 0ms rustc 1.87.0
ocaml 1.ml 373ms 1.9ms 5.2MB 360ms 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 19ms 0.1ms 1.8MB 10ms 0ms rustc 1.87.0
rust 7-i.rs 24ms 0.2ms 1.8MB 20ms 0ms rustc 1.87.0
rust 1.rs 25ms 0.2ms 1.8MB 20ms 0ms rustc 1.87.0
rust 3.rs 30ms 0.1ms 1.8MB 20ms 0ms rustc 1.89.0-nightly
rust 2.rs 30ms 0.4ms 1.8MB 20ms 0ms rustc 1.87.0
ocaml 1.ml 41ms 1.4ms 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 1.rs 317ms 11ms 40.9MB 300ms 0ms rustc 1.87.0
rust 2.rs 318ms 4.7ms 6.6MB 307ms 0ms rustc 1.87.0
ocaml 1.ml 957ms 3.4ms 550.3MB 900ms 43ms ocaml 5.3.0
ocaml 2.ml 1886ms 14ms 18.9MB 1873ms 0ms ocaml 5.3.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 1.rs 60ms 1.5ms 11.6MB 50ms 0ms rustc 1.87.0
rust 2.rs 78ms 0.2ms 2.9MB 70ms 0ms rustc 1.87.0
ocaml 1.ml 191ms 3.0ms 141.6MB 170ms 10ms ocaml 5.3.0
ocaml 2.ml 471ms 4.3ms 9.1MB 460ms 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 442ms 4.0ms 78.6MB 450ms 17ms rustc 1.87.0
ocaml 2.ml timeout 0.0ms 462.9MB 4830ms 153ms ocaml 5.3.0

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 7.rs 51ms 1.5ms 11.6MB 43ms 0ms rustc 1.87.0
ocaml 2.ml 549ms 4.5ms 57.1MB 513ms 23ms ocaml 5.3.0

spectral-norm

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 7-m.rs 492ms 0.0ms 2.1MB 1907ms 7ms rustc 1.87.0
rust 8-m.rs 497ms 4.4ms 2.4MB 1893ms 3ms rustc 1.89.0-nightly
rust 8.rs 991ms 0.5ms 2.3MB 980ms 0ms rustc 1.89.0-nightly
rust 7.rs 1957ms 10ms 1.9MB 1947ms 0ms rustc 1.87.0
rust 2-m.rs 2070ms 0.9ms 2.3MB 8153ms 7ms rustc 1.87.0
rust 2.rs 4266ms 8.9ms 2.1MB 4257ms 0ms rustc 1.87.0
ocaml 2.ml 4582ms 24ms 6.4MB 4570ms 0ms ocaml 5.3.0

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 7-m.rs 128ms 0.4ms 2.1MB 470ms 0ms rustc 1.87.0
rust 8-m.rs 128ms 0.2ms 2.3MB 470ms 0ms rustc 1.89.0-nightly
rust 8.rs 250ms 0.1ms 2.1MB 240ms 0ms rustc 1.89.0-nightly
rust 7.rs 495ms 6.2ms 1.8MB 487ms 0ms rustc 1.87.0
rust 2-m.rs 521ms 0.3ms 2.1MB 2020ms 3ms rustc 1.87.0
rust 2.rs 1067ms 0.1ms 2.0MB 1060ms 0ms rustc 1.87.0
ocaml 2.ml 1159ms 5.5ms 6.1MB 1150ms 0ms ocaml 5.3.0

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 8-m.rs 36ms 0.5ms 2.3MB 110ms 0ms rustc 1.89.0-nightly
rust 7-m.rs 36ms 0.5ms 2.0MB 113ms 0ms rustc 1.87.0
rust 8.rs 65ms 0.5ms 2.0MB 60ms 0ms rustc 1.89.0-nightly
rust 7.rs 125ms 1.2ms 1.9MB 120ms 0ms rustc 1.87.0
rust 2-m.rs 134ms 0.3ms 2.0MB 490ms 0ms rustc 1.87.0
rust 2.rs 269ms 0.2ms 1.9MB 260ms 0ms rustc 1.87.0
ocaml 2.ml 294ms 4.6ms 5.2MB 283ms 0ms ocaml 5.3.0