Programming Language and compiler
Benchmarks

OCaml VS Python 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
python 1.py 1186ms 0.8ms 96.2MB 1120ms 50ms pypy 3.10.16
ocaml 1.ml 3076ms 70ms 157.2MB 2993ms 73ms ocaml 5.3.0
python 1.py timeout 0.0ms 40.8MB 4970ms 17ms cpython 3.13.2
python 1.py timeout 0.0ms 40.6MB 4760ms 220ms pyston 3.8.12

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
python 1.py 98ms 2.9ms 68.8MB 70ms 13ms pypy 3.10.16
ocaml 1.ml 223ms 5.5ms 19.1MB 203ms 3ms ocaml 5.3.0
python 1.py 484ms 4.4ms 11.9MB 460ms 10ms pyston 3.8.12
python 1.py 745ms 25ms 12.6MB 737ms 0ms cpython 3.13.2

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
ocaml 6.ml 347ms 0.6ms 24.8MB 333ms 0ms ocaml 5.3.0
python 1.py 1871ms 16ms 88.8MB 1820ms 37ms pypy 3.10.16
python 5-m.py 2286ms 25ms 65.4MB 3523ms 857ms pypy 3.10.16
python 5-m.py 2628ms 276ms 12.5MB 3513ms 1170ms pyston 3.8.12
python 1.py 3017ms 11ms 8.1MB 3000ms 0ms pyston 3.8.12
python 5-m.py 3415ms 25ms 13.6MB 4547ms 940ms cpython 3.13.2
python 1.py 4761ms 15ms 8.8MB 4747ms 0ms cpython 3.13.2

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 6.ml 39ms 0.3ms 7.3MB 30ms 0ms ocaml 5.3.0
python 1.py 253ms 1.6ms 63.4MB 220ms 20ms pypy 3.10.16
python 1.py 314ms 5.5ms 8.1MB 303ms 0ms pyston 3.8.12
python 5-m.py 336ms 9.5ms 12.5MB 440ms 160ms pyston 3.8.12
python 5-m.py 404ms 2.2ms 13.5MB 487ms 137ms cpython 3.13.2
python 5-m.py 447ms 0.8ms 65.4MB 747ms 307ms pypy 3.10.16
python 1.py 490ms 12ms 8.8MB 477ms 0ms cpython 3.13.2

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 1.ml 1.9ms 0.1ms 5.0MB 0ms 0ms ocaml 5.3.0
python 1.py 11ms 0.6ms 7.6MB 0ms 0ms pyston 3.8.12
python 1.py 14ms 1.2ms 8.6MB 10ms 0ms cpython 3.13.2
python 1.py 29ms 0.5ms 51.6MB 8ms 10ms pypy 3.10.16

lru

Input: 1000 1000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
python 2.py 146ms 1.8ms 58.3MB 120ms 10ms pypy 3.10.16
python 1.py 181ms 2.9ms 59.3MB 153ms 13ms pypy 3.10.16
ocaml 1.ml 185ms 5.6ms 6.4MB 173ms 0ms ocaml 5.3.0
python 1.py 726ms 9.4ms 8.9MB 713ms 0ms pyston 3.8.12
python 2.py 831ms 7.8ms 8.5MB 817ms 0ms pyston 3.8.12
python 1.py 1180ms 49ms 9.3MB 1170ms 0ms cpython 3.13.2
python 2.py 1336ms 19ms 9.0MB 1323ms 0ms cpython 3.13.2

Input: 1000 3000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
python 2.py 342ms 5.4ms 59.2MB 313ms 10ms pypy 3.10.16
python 1.py 379ms 2.8ms 60.3MB 350ms 13ms pypy 3.10.16
ocaml 1.ml 537ms 16ms 6.6MB 527ms 0ms ocaml 5.3.0
python 1.py 2144ms 4.0ms 8.9MB 2130ms 0ms pyston 3.8.12
python 2.py 2479ms 16ms 8.5MB 2463ms 0ms pyston 3.8.12
python 1.py 3519ms 155ms 9.3MB 3507ms 0ms cpython 3.13.2
python 2.py 3929ms 97ms 9.0MB 3917ms 0ms cpython 3.13.2

Input: 100 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 1.ml 76ms 0.7ms 5.9MB 70ms 0ms ocaml 5.3.0
python 2.py 105ms 2.1ms 58.1MB 83ms 10ms pypy 3.10.16
python 1.py 122ms 3.8ms 58.7MB 97ms 10ms pypy 3.10.16
python 1.py 348ms 2.4ms 8.5MB 337ms 0ms pyston 3.8.12
python 2.py 387ms 3.3ms 8.1MB 373ms 0ms pyston 3.8.12
python 1.py 551ms 21ms 9.0MB 540ms 0ms cpython 3.13.2
python 2.py 640ms 9.1ms 8.8MB 627ms 0ms cpython 3.13.2

merkletrees

Input: 17

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
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
python 1.py 2248ms 18ms 202.7MB 2120ms 107ms pypy 3.10.16
python 1.py timeout 0.0ms 93.9MB 4960ms 27ms cpython 3.13.2
python 1.py timeout 0.0ms 130.4MB 4937ms 43ms pyston 3.8.12

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
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
python 1.py 386ms 6.0ms 105.2MB 323ms 47ms pypy 3.10.16
python 1.py 3142ms 32ms 37.1MB 3113ms 13ms cpython 3.13.2
python 1.py timeout 0.0ms 48.8MB 4970ms 20ms pyston 3.8.12

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 1.ml 377ms 1.5ms 5.3MB 367ms 0ms ocaml 5.3.0
python 2.py 1361ms 7.5ms 57.9MB 1337ms 10ms pypy 3.10.16
python 1.py 2657ms 16ms 57.2MB 2630ms 7ms pypy 3.10.16
python 1.py timeout 0.0ms 8.6MB 4990ms 0ms cpython 3.13.2
python 2.py timeout 0.0ms 8.8MB 4987ms 0ms cpython 3.13.2
python 1.py timeout 0.0ms 8.3MB 4990ms 0ms pyston 3.8.12
python 2.py timeout 0.0ms 8.1MB 4987ms 0ms pyston 3.8.12

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 1.ml 40ms 1.1ms 5.2MB 30ms 0ms ocaml 5.3.0
python 2.py 180ms 2.3ms 57.9MB 157ms 10ms pypy 3.10.16
python 1.py 303ms 3.6ms 57.1MB 277ms 10ms pypy 3.10.16
python 1.py 945ms 42ms 8.3MB 930ms 0ms pyston 3.8.12
python 2.py 1310ms 7.2ms 8.3MB 1297ms 0ms pyston 3.8.12
python 1.py 3278ms 579ms 8.6MB 3270ms 0ms cpython 3.13.2
python 2.py 3298ms 42ms 8.8MB 3287ms 0ms cpython 3.13.2

nsieve

Input: 12

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
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
python 1.py 2599ms 1.4ms 369.5MB 2530ms 57ms pypy 3.10.16
python 2.py 3039ms 28ms 633.0MB 2870ms 157ms pyston 3.8.12
python 1.py 4752ms 17ms 320.4MB 4690ms 47ms pyston 3.8.12
python 1.py timeout 0.0ms 321.1MB 4957ms 27ms cpython 3.13.2
python 2.py timeout 0.0ms 633.6MB 4830ms 153ms cpython 3.13.2
python 2.py timeout 0.0ms 959.9MB 4710ms 273ms pypy 3.10.16

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
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
python 1.py 540ms 8.7ms 135.2MB 507ms 20ms pypy 3.10.16
python 2.py 769ms 37ms 164.2MB 727ms 30ms pyston 3.8.12
python 1.py 1094ms 28ms 86.0MB 1070ms 7ms pyston 3.8.12
python 2.py 1513ms 103ms 164.8MB 1477ms 23ms cpython 3.13.2
python 2.py 1536ms 8.6ms 290.2MB 1450ms 70ms pypy 3.10.16
python 1.py 2723ms 5.6ms 86.8MB 2700ms 10ms cpython 3.13.2

regex-redux

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
python 1.py 2255ms 3.3ms 243.1MB 2197ms 40ms pypy 3.10.16
python 1.py 4775ms 5.8ms 225.9MB 4573ms 187ms pyston 3.8.12
ocaml 2.ml timeout 0.0ms 474.1MB 4813ms 173ms ocaml 5.3.0
python 1.py timeout 0.0ms 138.1MB 4930ms 53ms cpython 3.13.2

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
python 1.py 330ms 4.3ms 85.6MB 293ms 20ms pypy 3.10.16
python 1.py 501ms 1.3ms 36.2MB 470ms 17ms pyston 3.8.12
ocaml 2.ml 550ms 3.3ms 57.1MB 517ms 20ms ocaml 5.3.0
python 1.py 607ms 4.5ms 31.1MB 573ms 23ms cpython 3.13.2

spectral-norm

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 2.ml 4568ms 13ms 6.4MB 4557ms 0ms ocaml 5.3.0
python 8.py timeout 0.0ms 14.6MB 37ms 7ms cpython 3.13.2
python 8.py timeout 0.0ms 95.4MB 797ms 97ms pypy 3.10.16
python 8.py timeout 0.0ms 14.2MB 33ms 10ms pyston 3.8.12

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 2.ml 1153ms 6.9ms 6.1MB 1143ms 0ms ocaml 5.3.0
python 8.py timeout 0.0ms 14.5MB 53ms 13ms cpython 3.13.2
python 8.py timeout 0.0ms 96.1MB 1303ms 183ms pypy 3.10.16
python 8.py timeout 0.0ms 13.5MB 60ms 20ms pyston 3.8.12

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 2.ml 290ms 2.8ms 5.2MB 280ms 0ms ocaml 5.3.0
python 8-m.py 1980ms 4.3ms 93.0MB 6417ms 260ms pypy 3.10.16
python 8.py timeout 0.0ms 14.0MB 97ms 13ms cpython 3.13.2
python 8.py timeout 0.0ms 13.2MB 143ms 40ms pyston 3.8.12