Programming Language and compiler
Benchmarks

OCaml VS Nim 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
nim 2.nim 939ms 15ms 34.6MB 920ms 0ms nim 2.2.2
nim 2.nim 973ms 14ms 34.9MB 957ms 0ms nim/clang 2.2.2
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
nim 2.nim 89ms 2.5ms 5.5MB 80ms 0ms nim 2.2.2
nim 2.nim 92ms 1.1ms 5.9MB 80ms 0ms nim/clang 2.2.2
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
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
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
nim 2.nim 188ms 1.4ms 1.5MB 177ms 0ms nim 2.2.2
nim 2.nim 235ms 2.2ms 1.8MB 220ms 0ms nim/clang 2.2.2
ocaml 6.ml 347ms 0.6ms 24.8MB 333ms 0ms ocaml 5.3.0
nim 1.nim 557ms 2.8ms 1.8MB 453ms 90ms nim/clang 2.2.2
nim 1.nim 578ms 2.2ms 1.5MB 467ms 97ms nim 2.2.2

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 21ms 0.6ms 1.5MB 10ms 0ms nim 2.2.2
nim 2.nim 26ms 0.1ms 1.8MB 20ms 0ms nim/clang 2.2.2
ocaml 6.ml 39ms 0.3ms 7.3MB 30ms 0ms ocaml 5.3.0
nim 1.nim 59ms 1.1ms 1.8MB 40ms 7ms nim/clang 2.2.2
nim 1.nim 61ms 1.2ms 1.5MB 40ms 10ms nim 2.2.2

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 1.1ms 0.1ms 1.5MB 0ms 0ms nim 2.2.2
nim 1.nim 1.2ms 0.1ms 1.9MB 0ms 0ms nim/clang 2.2.2
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
nim 2.nim 112ms 2.2ms 1.4MB 103ms 0ms nim 2.2.2
nim 2.nim 113ms 2.4ms 1.6MB 103ms 0ms nim/clang 2.2.2
ocaml 1.ml 185ms 5.6ms 6.4MB 173ms 0ms ocaml 5.3.0
nim 1.nim timeout 0.0ms 1.3MB 4990ms 0ms nim 2.2.2
nim 1.nim timeout 0.0ms 1.5MB 4990ms 0ms nim/clang 2.2.2

Input: 1000 3000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 327ms 2.7ms 1.4MB 317ms 0ms nim 2.2.2
nim 2.nim 333ms 2.8ms 1.6MB 323ms 0ms nim/clang 2.2.2
ocaml 1.ml 537ms 16ms 6.6MB 527ms 0ms ocaml 5.3.0
nim 1.nim timeout 0.0ms 1.3MB 4990ms 0ms nim 2.2.2
nim 1.nim timeout 0.0ms 1.5MB 4990ms 0ms nim/clang 2.2.2

Input: 100 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 50ms 1.0ms 1.3MB 40ms 0ms nim 2.2.2
nim 2.nim 50ms 1.3ms 1.5MB 40ms 0ms nim/clang 2.2.2
ocaml 1.ml 76ms 0.7ms 5.9MB 70ms 0ms ocaml 5.3.0
nim 1.nim 457ms 14ms 1.5MB 447ms 0ms nim/clang 2.2.2
nim 1.nim 485ms 9.7ms 1.3MB 477ms 0ms nim 2.2.2

merkletrees

Input: 17

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 536ms 5.2ms 34.6MB 517ms 0ms nim 2.2.2
nim 1.nim 634ms 23ms 34.9MB 617ms 3ms nim/clang 2.2.2
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
nim 1.nim 117ms 2.6ms 9.6MB 103ms 0ms nim 2.2.2
nim 1.nim 136ms 2.3ms 9.9MB 120ms 0ms nim/clang 2.2.2
ocaml 1.ml 149ms 1.0ms 21.7MB 133ms 7ms ocaml 5.3.0
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
nim 2.nim 321ms 0.7ms 1.8MB 310ms 0ms nim 2.2.2
nim 2.nim 345ms 0.7ms 2.0MB 337ms 0ms nim/clang 2.2.2
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
nim 2.nim 35ms 0.6ms 1.8MB 30ms 0ms nim 2.2.2
ocaml 1.ml 40ms 1.1ms 5.2MB 30ms 0ms ocaml 5.3.0
nim 2.nim 43ms 4.9ms 2.0MB 33ms 0ms nim/clang 2.2.2

nsieve

Input: 12

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 314ms 16ms 41.8MB 303ms 0ms nim/clang 2.2.2
nim 1.nim 316ms 3.7ms 41.5MB 303ms 0ms nim 2.2.2
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
nim 1.nim 56ms 2.8ms 11.5MB 47ms 0ms nim 2.2.2
nim 1.nim 60ms 5.5ms 11.8MB 47ms 0ms nim/clang 2.2.2
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
nim 1.nim 1631ms 8.4ms 164.1MB 1603ms 10ms nim/clang 2.2.2
nim 1.nim 1689ms 6.4ms 163.9MB 1660ms 17ms nim 2.2.2
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
nim 1.nim 172ms 3.9ms 18.3MB 160ms 0ms nim/clang 2.2.2
nim 1.nim 180ms 2.6ms 20.5MB 167ms 0ms nim 2.2.2
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
nim 1.nim 3596ms 8.4ms 1.6MB 3587ms 0ms nim/clang 2.2.2
nim 1.nim 3599ms 8.1ms 1.4MB 3593ms 0ms nim 2.2.2
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
nim 1.nim 899ms 0.6ms 1.5MB 890ms 0ms nim/clang 2.2.2
nim 1.nim 902ms 2.3ms 1.3MB 890ms 0ms nim 2.2.2
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
nim 1.nim 227ms 0.5ms 1.5MB 220ms 0ms nim/clang 2.2.2
nim 1.nim 229ms 0.9ms 1.3MB 220ms 0ms nim 2.2.2
ocaml 2.ml 290ms 2.8ms 5.2MB 280ms 0ms ocaml 5.3.0