Programming Language and compiler
Benchmarks

Nim VS OCaml benchmarks

Current benchmark data was generated on Sun Jun 01 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
nim 2.nim 779ms 1.2ms 34.4MB 760ms 3ms nim 2.2.4
nim 2.nim 963ms 9.3ms 35.2MB 940ms 10ms nim/clang 2.2.4
ocaml 1.ml 2989ms 28ms 157.2MB 2907ms 67ms ocaml 5.3.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 75ms 4.0ms 5.5MB 63ms 0ms nim 2.2.4
nim 2.nim 91ms 2.7ms 5.8MB 80ms 0ms nim/clang 2.2.4
ocaml 1.ml 218ms 4.7ms 19.2MB 203ms 0ms ocaml 5.3.0

coro-prime-sieve

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim timeout 0.0ms 574.3MB 2627ms 1900ms nim 2.2.4
nim 1.nim timeout 0.0ms 574.8MB 2630ms 1897ms nim/clang 2.2.4

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 4103ms 11ms 519.8MB 2090ms 1590ms nim/clang 2.2.4
nim 1.nim 4106ms 11ms 519.3MB 2163ms 1517ms nim 2.2.4

fasta

Input: 2500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 189ms 1.2ms 1.5MB 180ms 0ms nim 2.2.4
nim 2.nim 241ms 2.6ms 1.8MB 230ms 0ms nim/clang 2.2.4
ocaml 6.ml 345ms 0.9ms 24.9MB 333ms 0ms ocaml 5.3.0
nim 1.nim 535ms 1.0ms 1.8MB 430ms 90ms nim/clang 2.2.4
nim 1.nim 558ms 2.5ms 1.5MB 473ms 67ms nim 2.2.4

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 22ms 0.1ms 1.5MB 13ms 0ms nim 2.2.4
nim 2.nim 27ms 1.0ms 1.8MB 20ms 0ms nim/clang 2.2.4
ocaml 6.ml 38ms 0.1ms 7.3MB 30ms 0ms ocaml 5.3.0
nim 1.nim 57ms 0.5ms 1.8MB 40ms 3ms nim/clang 2.2.4
nim 1.nim 57ms 0.2ms 1.5MB 40ms 3ms nim 2.2.4

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 0.9ms 0.0ms 1.5MB 0ms 0ms nim 2.2.4
nim 1.nim 1.1ms 0.0ms 1.9MB 0ms 0ms nim/clang 2.2.4
ocaml 1.ml 1.7ms 0.1ms 5.1MB 0ms 0ms ocaml 5.3.0

lru

Input: 1000 1000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 111ms 2.3ms 1.6MB 100ms 0ms nim/clang 2.2.4
nim 2.nim 114ms 1.7ms 1.4MB 110ms 0ms nim 2.2.4
ocaml 1.ml 187ms 3.7ms 6.4MB 177ms 0ms ocaml 5.3.0
nim 1.nim timeout 0.0ms 1.3MB 4990ms 0ms nim 2.2.4
nim 1.nim timeout 0.0ms 1.5MB 4990ms 0ms nim/clang 2.2.4

Input: 1000 3000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 328ms 1.4ms 1.6MB 320ms 0ms nim/clang 2.2.4
nim 2.nim 333ms 1.4ms 1.4MB 323ms 0ms nim 2.2.4
ocaml 1.ml 540ms 17ms 6.6MB 530ms 0ms ocaml 5.3.0
nim 1.nim timeout 0.0ms 1.3MB 4990ms 0ms nim 2.2.4
nim 1.nim timeout 0.0ms 1.5MB 4990ms 0ms nim/clang 2.2.4

Input: 100 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 48ms 0.6ms 1.5MB 40ms 0ms nim/clang 2.2.4
nim 2.nim 51ms 0.8ms 1.3MB 40ms 0ms nim 2.2.4
ocaml 1.ml 78ms 1.8ms 6.2MB 70ms 0ms ocaml 5.3.0
nim 1.nim 476ms 7.0ms 1.5MB 467ms 0ms nim/clang 2.2.4
nim 1.nim 480ms 4.8ms 1.3MB 473ms 0ms nim 2.2.4

mandelbrot

Input: 5000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 389ms 1.0ms 4.8MB 380ms 0ms nim/clang 2.2.4
nim 1.nim 578ms 2.7ms 4.5MB 567ms 0ms nim 2.2.4

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 18ms 0.2ms 1.9MB 10ms 0ms nim/clang 2.2.4
nim 1.nim 26ms 0.6ms 1.6MB 20ms 0ms nim 2.2.4

merkletrees

Input: 17

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 546ms 4.1ms 33.9MB 530ms 3ms nim 2.2.4
nim 1.nim 627ms 11ms 35.2MB 607ms 10ms nim/clang 2.2.4
ocaml 1.ml 1076ms 24ms 70.2MB 1033ms 30ms ocaml 5.3.0
ocaml 2.ml 2078ms 22ms 91.8MB 2027ms 37ms ocaml 5.3.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 119ms 2.2ms 9.6MB 110ms 0ms nim 2.2.4
nim 1.nim 137ms 5.9ms 9.9MB 123ms 0ms nim/clang 2.2.4
ocaml 1.ml 146ms 3.2ms 21.6MB 127ms 3ms ocaml 5.3.0
ocaml 2.ml 355ms 5.3ms 27.7MB 337ms 3ms ocaml 5.3.0

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 318ms 0.5ms 1.8MB 310ms 0ms nim 2.2.4
nim 2.nim 344ms 2.8ms 2.0MB 337ms 0ms nim/clang 2.2.4
ocaml 1.ml 371ms 0.1ms 5.3MB 360ms 0ms ocaml 5.3.0

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 34ms 0.6ms 1.8MB 30ms 0ms nim 2.2.4
nim 2.nim 37ms 1.1ms 2.0MB 30ms 0ms nim/clang 2.2.4
ocaml 1.ml 41ms 1.7ms 5.2MB 33ms 0ms ocaml 5.3.0

nsieve

Input: 12

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 264ms 6.1ms 41.5MB 250ms 0ms nim 2.2.4
nim 1.nim 316ms 7.7ms 41.8MB 300ms 0ms nim/clang 2.2.4
ocaml 1.ml 945ms 20ms 552.1MB 883ms 47ms ocaml 5.3.0
ocaml 2.ml 1894ms 13ms 18.5MB 1883ms 0ms ocaml 5.3.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 52ms 2.1ms 11.5MB 47ms 0ms nim 2.2.4
nim 1.nim 63ms 5.6ms 11.8MB 53ms 0ms nim/clang 2.2.4
ocaml 1.ml 183ms 0.9ms 141.7MB 160ms 10ms ocaml 5.3.0
ocaml 2.ml 467ms 6.7ms 9.1MB 453ms 0ms ocaml 5.3.0

regex-redux

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 1643ms 3.6ms 152.4MB 1610ms 20ms nim/clang 2.2.4
nim 1.nim 1672ms 3.8ms 152.1MB 1640ms 20ms nim 2.2.4
ocaml 2.ml timeout 0.0ms 477.0MB 4823ms 167ms ocaml 5.3.0

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 174ms 2.8ms 16.8MB 160ms 0ms nim/clang 2.2.4
nim 1.nim 176ms 2.8ms 17.4MB 160ms 0ms nim 2.2.4
ocaml 2.ml 545ms 3.7ms 57.1MB 510ms 23ms ocaml 5.3.0

spectral-norm

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 3587ms 1.2ms 1.6MB 3580ms 0ms nim/clang 2.2.4
nim 1.nim 3604ms 3.0ms 1.8MB 3593ms 0ms nim 2.2.4
ocaml 2.ml 4557ms 9.2ms 6.3MB 4543ms 0ms ocaml 5.3.0

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 898ms 0.5ms 1.5MB 890ms 0ms nim/clang 2.2.4
nim 1.nim 903ms 2.7ms 1.3MB 893ms 0ms nim 2.2.4
ocaml 2.ml 1144ms 6.9ms 6.1MB 1133ms 0ms ocaml 5.3.0

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 226ms 0.4ms 1.5MB 220ms 0ms nim/clang 2.2.4
nim 1.nim 229ms 1.5ms 1.3MB 220ms 0ms nim 2.2.4
ocaml 2.ml 295ms 8.4ms 5.2MB 283ms 0ms ocaml 5.3.0