OCaml VS Nim benchmarks

Current benchmark data was generated on Fri Aug 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 685ms 7.3ms 36.3MB 667ms 7ms nim 2.2.4
nim 2.nim 978ms 54ms 35.2MB 957ms 3ms nim/clang 2.2.4
ocaml 1.ml 3020ms 42ms 157.0MB 2927ms 77ms ocaml 5.3.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 64ms 2.2ms 6.9MB 53ms 0ms nim 2.2.4
nim 2.nim 93ms 1.9ms 5.8MB 80ms 0ms nim/clang 2.2.4
ocaml 1.ml 223ms 9.3ms 19.2MB 207ms 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 2910ms 2.6ms 4.9MB 2900ms 0ms ocaml 5.3.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 2.ml 244ms 0.9ms 4.9MB 230ms 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 209ms 1.0ms 2.6MB 200ms 0ms nim 2.2.4
nim 2.nim 240ms 0.0ms 1.8MB 230ms 0ms nim/clang 2.2.4
ocaml 6.ml 346ms 1.8ms 24.8MB 333ms 0ms ocaml 5.3.0
nim 1.nim 535ms 2.6ms 1.8MB 440ms 80ms nim/clang 2.2.4
nim 1.nim 566ms 4.2ms 2.8MB 473ms 80ms nim 2.2.4

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 24ms 1.0ms 2.6MB 13ms 0ms nim 2.2.4
nim 2.nim 26ms 0.1ms 1.8MB 20ms 0ms nim/clang 2.2.4
ocaml 6.ml 39ms 0.4ms 7.3MB 30ms 0ms ocaml 5.3.0
nim 1.nim 56ms 1.1ms 1.8MB 40ms 3ms nim/clang 2.2.4
nim 1.nim 59ms 0.1ms 2.6MB 43ms 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 1.1ms 0.0ms 1.9MB 0ms 0ms nim/clang 2.2.4
nim 1.nim 1.6ms 0.2ms 2.6MB 0ms 0ms nim 2.2.4
ocaml 1.ml 1.8ms 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 104ms 1.0ms 2.6MB 97ms 0ms nim 2.2.4
nim 2.nim 110ms 2.5ms 1.9MB 103ms 0ms nim/clang 2.2.4
ocaml 1.ml 187ms 2.5ms 6.4MB 180ms 0ms ocaml 5.3.0
nim 1.nim timeout 0.0ms 2.6MB 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 306ms 2.9ms 2.6MB 300ms 0ms nim 2.2.4
nim 2.nim 324ms 3.6ms 1.6MB 313ms 0ms nim/clang 2.2.4
ocaml 1.ml 537ms 13ms 6.6MB 523ms 0ms ocaml 5.3.0
nim 1.nim timeout 0.0ms 2.6MB 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 45ms 0.1ms 2.6MB 40ms 0ms nim 2.2.4
nim 2.nim 49ms 1.5ms 1.5MB 40ms 0ms nim/clang 2.2.4
ocaml 1.ml 75ms 0.2ms 5.9MB 67ms 0ms ocaml 5.3.0
nim 1.nim 364ms 4.5ms 2.6MB 353ms 0ms nim 2.2.4
nim 1.nim 495ms 19ms 1.5MB 487ms 0ms nim/clang 2.2.4

merkletrees

Input: 17

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 460ms 6.9ms 36.3MB 443ms 10ms nim 2.2.4
nim 1.nim 629ms 11ms 35.2MB 610ms 3ms nim/clang 2.2.4
ocaml 1.ml 1113ms 16ms 70.2MB 1073ms 27ms ocaml 5.3.0
ocaml 2.ml 2055ms 6.7ms 91.8MB 2000ms 40ms ocaml 5.3.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 95ms 2.9ms 11.0MB 83ms 0ms nim 2.2.4
nim 1.nim 134ms 0.8ms 9.9MB 123ms 0ms nim/clang 2.2.4
ocaml 1.ml 146ms 2.9ms 21.7MB 130ms 7ms ocaml 5.3.0
ocaml 2.ml 358ms 7.5ms 27.6MB 340ms 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 319ms 1.0ms 2.9MB 310ms 0ms nim 2.2.4
nim 2.nim 343ms 2.4ms 2.0MB 333ms 0ms nim/clang 2.2.4
ocaml 1.ml 373ms 2.9ms 5.2MB 363ms 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 0.2ms 2.9MB 30ms 0ms nim 2.2.4
nim 2.nim 38ms 1.4ms 2.0MB 30ms 0ms nim/clang 2.2.4
ocaml 1.ml 42ms 0.9ms 5.3MB 30ms 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 274ms 4.6ms 42.9MB 260ms 0ms nim 2.2.4
nim 1.nim 316ms 6.2ms 41.8MB 307ms 0ms nim/clang 2.2.4
ocaml 1.ml 932ms 21ms 543.2MB 877ms 43ms ocaml 5.3.0
ocaml 2.ml 1887ms 12ms 19.0MB 1873ms 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 3.2ms 12.8MB 43ms 0ms nim 2.2.4
nim 1.nim 66ms 3.5ms 11.8MB 57ms 0ms nim/clang 2.2.4
ocaml 1.ml 175ms 1.5ms 142.1MB 150ms 10ms ocaml 5.3.0
ocaml 2.ml 469ms 6.0ms 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 1635ms 1.6ms 161.2MB 1603ms 17ms nim 2.2.4
nim 1.nim 1643ms 6.4ms 152.4MB 1610ms 17ms nim/clang 2.2.4
ocaml 2.ml timeout 0.0ms 462.8MB 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 173ms 1.2ms 19.7MB 160ms 0ms nim 2.2.4
nim 1.nim 173ms 1.9ms 17.6MB 160ms 0ms nim/clang 2.2.4
ocaml 2.ml 549ms 3.2ms 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 3589ms 0.8ms 1.6MB 3580ms 0ms nim/clang 2.2.4
nim 1.nim 3591ms 1.0ms 2.8MB 3580ms 0ms nim 2.2.4
ocaml 2.ml 4574ms 4.7ms 6.4MB 4563ms 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 2.2.4
nim 1.nim 901ms 1.3ms 2.6MB 890ms 0ms nim 2.2.4
ocaml 2.ml 1166ms 5.8ms 5.9MB 1153ms 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 0.4ms 1.5MB 220ms 0ms nim/clang 2.2.4
nim 1.nim 228ms 1.2ms 2.6MB 220ms 0ms nim 2.2.4
ocaml 2.ml 295ms 3.8ms 5.2MB 283ms 0ms ocaml 5.3.0