Programming Language and compiler
Benchmarks

Rust VS OCaml benchmarks

Current benchmark data was generated on Mon May 19 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.)

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 1.87.0
rust 1.rs 1.7ms 0.6ms 1.8MB 0ms 0ms rustc 1.89.0-nightly
ocaml 1.ml 1.8ms 0.1ms 5.1MB 0ms 0ms ocaml 5.3.0

mandelbrot

Input: 5000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 9.rs 265ms 15ms 4.9MB 253ms 0ms rustc 1.89.0-nightly
rust 8.rs 291ms 0.6ms 4.8MB 280ms 0ms rustc 1.87.0

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 9.rs 13ms 0.5ms 2.0MB 10ms 0ms rustc 1.89.0-nightly
rust 8.rs 14ms 0.2ms 1.9MB 10ms 0ms rustc 1.87.0

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 4-i.rs 164ms 0.6ms 1.8MB 160ms 0ms rustc 1.87.0
rust 7-i.rs 218ms 0.5ms 1.8MB 210ms 0ms rustc 1.87.0
rust 1.rs 229ms 1.1ms 1.8MB 220ms 0ms rustc 1.87.0
rust 2.rs 279ms 0.0ms 1.8MB 270ms 0ms rustc 1.87.0
rust 3.rs 279ms 0.5ms 1.8MB 270ms 0ms rustc 1.89.0-nightly
ocaml 1.ml 379ms 1.8ms 5.2MB 370ms 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 0.1ms 1.8MB 10ms 0ms rustc 1.87.0
rust 7-i.rs 24ms 0.4ms 1.8MB 20ms 0ms rustc 1.87.0
rust 1.rs 25ms 0.4ms 1.8MB 20ms 0ms rustc 1.87.0
rust 2.rs 30ms 0.0ms 1.6MB 20ms 0ms rustc 1.87.0
rust 3.rs 30ms 0.1ms 1.8MB 20ms 0ms rustc 1.89.0-nightly
ocaml 1.ml 41ms 1.5ms 5.3MB 30ms 0ms 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 493ms 0.6ms 2.5MB 1910ms 0ms rustc 1.89.0-nightly
rust 7-m.rs 493ms 0.7ms 2.1MB 1910ms 0ms rustc 1.87.0
rust 8.rs 993ms 1.0ms 2.3MB 983ms 0ms rustc 1.89.0-nightly
rust 7.rs 1961ms 4.4ms 1.9MB 1950ms 0ms rustc 1.87.0
rust 2-m.rs 2070ms 3.8ms 2.3MB 8130ms 10ms rustc 1.87.0
rust 2.rs 4266ms 1.8ms 2.1MB 4257ms 0ms rustc 1.87.0
ocaml 2.ml 4567ms 9.8ms 6.3MB 4560ms 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 127ms 0.5ms 2.3MB 467ms 3ms rustc 1.89.0-nightly
rust 7-m.rs 128ms 0.3ms 2.1MB 467ms 3ms rustc 1.87.0
rust 8.rs 251ms 0.6ms 2.0MB 240ms 0ms rustc 1.89.0-nightly
rust 7.rs 493ms 1.4ms 1.8MB 480ms 0ms rustc 1.87.0
rust 2-m.rs 521ms 0.9ms 2.3MB 2030ms 0ms rustc 1.87.0
rust 2.rs 1069ms 4.4ms 2.0MB 1063ms 0ms rustc 1.87.0
ocaml 2.ml 1147ms 4.8ms 6.1MB 1137ms 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 35ms 0.1ms 2.1MB 107ms 3ms rustc 1.89.0-nightly
rust 7-m.rs 36ms 0.6ms 2.0MB 113ms 0ms rustc 1.87.0
rust 8.rs 65ms 0.9ms 1.9MB 60ms 0ms rustc 1.89.0-nightly
rust 7.rs 128ms 2.5ms 1.8MB 120ms 0ms rustc 1.87.0
rust 2-m.rs 134ms 0.7ms 2.1MB 490ms 3ms rustc 1.87.0
rust 2.rs 269ms 1.2ms 1.9MB 260ms 0ms rustc 1.87.0
ocaml 2.ml 295ms 7.0ms 5.2MB 287ms 0ms ocaml 5.3.0

binarytrees

Input: 18

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 4.rs 1281ms 13ms 33.8MB 1260ms 7ms rustc 1.87.0
rust 5.rs 1340ms 6.3ms 33.8MB 1317ms 10ms rustc 1.87.0
rust 3.rs 1496ms 49ms 49.8MB 1463ms 17ms rustc 1.87.0
ocaml 1.ml 3022ms 19ms 157.1MB 2943ms 60ms ocaml 5.3.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 4.rs 118ms 0.3ms 5.6MB 110ms 0ms rustc 1.87.0
rust 5.rs 128ms 5.4ms 5.8MB 117ms 0ms rustc 1.87.0
rust 3.rs 142ms 6.5ms 7.8MB 130ms 0ms rustc 1.87.0
ocaml 1.ml 219ms 1.7ms 19.1MB 200ms 3ms ocaml 5.3.0

coro-prime-sieve

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 3-m.rs 518ms 38ms 9.1MB 1957ms 60ms rustc 1.87.0
rust 5-m.rs 679ms 12ms 5.5MB 2580ms 67ms rustc 1.87.0
rust 1-m.rs 955ms 8.3ms 7.4MB 3497ms 227ms rustc 1.87.0
rust 3.rs 1110ms 9.5ms 9.3MB 1070ms 23ms rustc 1.87.0
rust 4.rs 1921ms 31ms 6.9MB 1903ms 0ms rustc 1.87.0

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 5-m.rs 51ms 1.1ms 3.3MB 153ms 10ms rustc 1.87.0
rust 3-m.rs 55ms 3.2ms 4.1MB 173ms 10ms rustc 1.87.0
rust 3.rs 69ms 0.8ms 4.0MB 60ms 0ms rustc 1.87.0
rust 1-m.rs 73ms 0.3ms 3.5MB 237ms 17ms rustc 1.87.0
rust 4.rs 115ms 1.2ms 3.1MB 107ms 0ms rustc 1.87.0

edigits

Input: 250001

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 1.rs 124ms 1.5ms 3.6MB 120ms 0ms rustc 1.87.0
rust 2.rs 421ms 2.7ms 3.6MB 410ms 0ms rustc 1.87.0

Input: 100000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 1.rs 33ms 0.7ms 2.9MB 23ms 0ms rustc 1.87.0
rust 2.rs 77ms 2.2ms 3.0MB 70ms 0ms rustc 1.87.0

fannkuch-redux

Input: 11

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 3-im.rs 410ms 1.7ms 2.1MB 1587ms 0ms rustc 1.87.0
rust 5-m.rs 554ms 1.8ms 2.1MB 2130ms 0ms rustc 1.87.0
rust 2-im.rs 677ms 6.8ms 2.1MB 2577ms 0ms rustc 1.87.0
rust 1-m.rs 937ms 1.3ms 2.1MB 3610ms 0ms rustc 1.87.0
rust 3-i.rs 1497ms 1.4ms 1.9MB 1490ms 0ms rustc 1.87.0
rust 2-i.rs 2404ms 0.4ms 1.8MB 2397ms 0ms rustc 1.87.0
rust 1.rs 2718ms 7.7ms 1.8MB 2710ms 0ms rustc 1.87.0
ocaml 2.ml 2919ms 5.3ms 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 0.2ms 2.0MB 120ms 0ms rustc 1.87.0
rust 5-m.rs 52ms 0.4ms 2.0MB 170ms 0ms rustc 1.87.0
rust 2-im.rs 61ms 2.2ms 2.0MB 200ms 0ms rustc 1.87.0
rust 1-m.rs 83ms 0.6ms 2.0MB 290ms 0ms rustc 1.87.0
rust 3-i.rs 125ms 0.5ms 1.9MB 120ms 0ms rustc 1.87.0
rust 2-i.rs 197ms 0.2ms 1.8MB 190ms 0ms rustc 1.87.0
rust 1.rs 223ms 0.9ms 1.8MB 213ms 0ms rustc 1.87.0
ocaml 2.ml 245ms 3.9ms 4.9MB 233ms 0ms ocaml 5.3.0

fasta

Input: 2500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 6.rs 88ms 2.2ms 1.9MB 80ms 0ms rustc 1.87.0
rust 5c-m.rs 88ms 0.3ms 3.4MB 240ms 0ms rustc 1.87.0
rust 5-m.rs 94ms 0.1ms 3.2MB 290ms 3ms rustc 1.87.0
rust 1c.rs 163ms 0.5ms 1.9MB 150ms 0ms rustc 1.87.0
rust 1.rs 194ms 0.9ms 2.0MB 183ms 0ms rustc 1.87.0
ocaml 6.ml 346ms 1.0ms 24.9MB 333ms 0ms ocaml 5.3.0

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 6.rs 11ms 0.1ms 1.9MB 0ms 0ms rustc 1.87.0
rust 5c-m.rs 15ms 0.3ms 3.2MB 20ms 0ms rustc 1.87.0
rust 5-m.rs 16ms 0.6ms 3.2MB 30ms 0ms rustc 1.87.0
rust 1c.rs 19ms 0.4ms 1.9MB 10ms 0ms rustc 1.87.0
rust 1.rs 21ms 0.3ms 1.9MB 10ms 0ms rustc 1.87.0
ocaml 6.ml 39ms 0.8ms 7.5MB 30ms 0ms ocaml 5.3.0

http-server

Input: 3000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 1-m.rs 270ms 61ms 77.4MB 157ms 457ms rustc 1.87.0
rust 2-http2.rs 326ms 164ms 68.9MB 737ms 370ms rustc 1.87.0
rust 2-m.rs 345ms 31ms 71.5MB 227ms 810ms rustc 1.87.0
rust 1-http2.rs 448ms 106ms 63.1MB 1033ms 527ms rustc 1.87.0

Input: 500

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 1-m.rs 36ms 6.9ms 13.5MB 10ms 53ms rustc 1.87.0
rust 2-m.rs 71ms 2.4ms 20.4MB 33ms 147ms rustc 1.87.0
rust 1-http2.rs 230ms 40ms 26.1MB 613ms 183ms rustc 1.87.0
rust 2-http2.rs 239ms 44ms 28.0MB 623ms 190ms rustc 1.87.0

json-serde

Input: sample 5000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 5-i.rs 28ms 0.6ms 9.8MB 20ms 0ms rustc 1.87.0
rust 4-i.rs 30ms 0.8ms 7.9MB 20ms 0ms rustc 1.87.0
rust 2.rs 61ms 2.0ms 33.8MB 40ms 10ms rustc 1.87.0
rust 3.rs 61ms 0.0ms 32.0MB 40ms 10ms rustc 1.87.0
rust 1.rs 103ms 1.7ms 67.4MB 63ms 27ms rustc 1.87.0

Input: canada 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 5-i.rs 211ms 3.8ms 52.8MB 187ms 10ms rustc 1.87.0
rust 4-i.rs 261ms 3.9ms 54.5MB 207ms 43ms rustc 1.87.0
rust 2.rs 395ms 2.3ms 237.8MB 290ms 90ms rustc 1.87.0
rust 3.rs 404ms 3.8ms 237.8MB 300ms 93ms rustc 1.87.0
rust 1.rs 686ms 3.1ms 551.8MB 433ms 233ms rustc 1.87.0

knucleotide

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 8-m.rs 211ms 4.2ms 27.7MB 623ms 10ms rustc 1.87.0
rust 8.rs 427ms 19ms 24.0MB 407ms 7ms rustc 1.87.0

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 8-m.rs 29ms 0.6ms 15.4MB 60ms 0ms rustc 1.87.0
rust 8.rs 56ms 2.1ms 11.4MB 40ms 0ms rustc 1.87.0

lru

Input: 1000 1000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 0-unsafe.rs 35ms 7.9ms 1.8MB 27ms 0ms rustc 1.87.0
rust 1.rs 51ms 6.1ms 1.9MB 43ms 0ms rustc 1.87.0
ocaml 1.ml 178ms 7.5ms 6.6MB 167ms 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 139ms 28ms 1.9MB 130ms 0ms rustc 1.87.0
rust 1.rs 191ms 16ms 1.9MB 183ms 0ms rustc 1.87.0
ocaml 1.ml 536ms 22ms 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 24ms 1.0ms 1.8MB 17ms 0ms rustc 1.87.0
rust 1.rs 31ms 0.2ms 1.8MB 20ms 0ms rustc 1.87.0
ocaml 1.ml 77ms 1.7ms 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 698ms 4.2ms 33.8MB 673ms 10ms rustc 1.87.0
ocaml 1.ml 1089ms 3.3ms 70.2MB 1053ms 20ms ocaml 5.3.0
ocaml 2.ml 2063ms 7.0ms 91.8MB 2010ms 40ms ocaml 5.3.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 1.ml 147ms 2.5ms 21.7MB 130ms 3ms ocaml 5.3.0
rust 1.rs 153ms 2.6ms 9.8MB 143ms 0ms rustc 1.87.0
ocaml 2.ml 366ms 7.2ms 27.6MB 343ms 10ms ocaml 5.3.0

nsieve

Input: 12

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 2.rs 301ms 0.2ms 6.6MB 290ms 0ms rustc 1.87.0
rust 1.rs 331ms 4.3ms 40.9MB 317ms 0ms rustc 1.87.0
ocaml 1.ml 940ms 9.1ms 541.2MB 883ms 43ms ocaml 5.3.0
ocaml 2.ml 1904ms 37ms 19.0MB 1893ms 0ms ocaml 5.3.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 1.rs 67ms 0.1ms 11.6MB 57ms 0ms rustc 1.87.0
rust 2.rs 77ms 2.0ms 2.9MB 70ms 0ms rustc 1.87.0
ocaml 1.ml 178ms 1.2ms 142.2MB 157ms 10ms ocaml 5.3.0
ocaml 2.ml 471ms 3.6ms 9.1MB 460ms 0ms ocaml 5.3.0

pidigits

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 1.rs 1529ms 17ms 2.7MB 1310ms 203ms rustc 1.87.0
rust 2.rs 1712ms 5.2ms 2.7MB 1627ms 70ms rustc 1.87.0

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 1.rs 321ms 3.7ms 2.4MB 297ms 10ms rustc 1.87.0
rust 2.rs 385ms 5.9ms 2.4MB 377ms 0ms rustc 1.87.0

regex-redux

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 7.rs 442ms 2.7ms 78.6MB 453ms 17ms rustc 1.87.0
ocaml 2.ml timeout 0.0ms 462.8MB 4830ms 157ms 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 0.8ms 11.6MB 43ms 3ms rustc 1.87.0
ocaml 2.ml 549ms 15ms 57.1MB 513ms 23ms ocaml 5.3.0

secp256k1

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 0.rs 117ms 2.1ms 1.8MB 110ms 0ms rustc 1.87.0
rust 1.rs 1448ms 50ms 1.9MB 1437ms 0ms rustc 1.87.0

Input: 500

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 0.rs 31ms 0.7ms 1.8MB 23ms 0ms rustc 1.87.0
rust 1.rs 357ms 4.0ms 1.9MB 347ms 0ms rustc 1.87.0