Programming Language and compiler
Benchmarks

OCaml VS Python 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.)

binarytrees

Input: 18

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
python 1.py 1208ms 7.9ms 96.1MB 1143ms 53ms pypy 3.10.16
ocaml 1.ml 3022ms 19ms 157.1MB 2943ms 60ms ocaml 5.3.0
python 1.py timeout 0.0ms 40.9MB 4963ms 20ms cpython 3.13.3
python 1.py timeout 0.0ms 40.5MB 4757ms 230ms pyston 3.8.12

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
python 1.py 97ms 2.2ms 68.8MB 70ms 13ms pypy 3.10.16
ocaml 1.ml 219ms 1.7ms 19.1MB 200ms 3ms ocaml 5.3.0
python 1.py 476ms 3.5ms 11.9MB 453ms 10ms pyston 3.8.12
python 1.py 736ms 14ms 12.8MB 723ms 0ms cpython 3.13.3

fannkuch-redux

Input: 11

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
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
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
ocaml 6.ml 346ms 1.0ms 24.9MB 333ms 0ms ocaml 5.3.0
python 1.py 1852ms 2.6ms 88.9MB 1803ms 30ms pypy 3.10.16
python 5-m.py 2288ms 4.5ms 65.6MB 3530ms 820ms pypy 3.10.16
python 5-m.py 2438ms 9.1ms 12.5MB 3527ms 990ms pyston 3.8.12
python 1.py 3053ms 14ms 8.1MB 3040ms 0ms pyston 3.8.12
python 5-m.py 3439ms 104ms 13.9MB 4590ms 917ms cpython 3.13.3
python 1.py 4786ms 32ms 8.8MB 4770ms 0ms cpython 3.13.3

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 6.ml 39ms 0.8ms 7.5MB 30ms 0ms ocaml 5.3.0
python 1.py 249ms 3.9ms 63.3MB 223ms 13ms pypy 3.10.16
python 5-m.py 311ms 2.2ms 12.5MB 393ms 150ms pyston 3.8.12
python 1.py 314ms 3.8ms 8.1MB 300ms 0ms pyston 3.8.12
python 5-m.py 405ms 4.1ms 13.9MB 497ms 133ms cpython 3.13.3
python 5-m.py 442ms 3.9ms 65.6MB 733ms 303ms pypy 3.10.16
python 1.py 495ms 2.8ms 8.9MB 483ms 0ms cpython 3.13.3

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 1.ml 1.8ms 0.1ms 5.1MB 0ms 0ms ocaml 5.3.0
python 1.py 11ms 0.3ms 7.6MB 0ms 0ms pyston 3.8.12
python 1.py 13ms 0.5ms 8.8MB 10ms 0ms cpython 3.13.3
python 1.py 29ms 1.2ms 51.7MB 10ms 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 147ms 4.7ms 58.4MB 123ms 10ms pypy 3.10.16
python 1.py 178ms 0.9ms 59.5MB 153ms 10ms pypy 3.10.16
ocaml 1.ml 178ms 7.5ms 6.6MB 167ms 0ms ocaml 5.3.0
python 1.py 729ms 8.4ms 8.9MB 720ms 0ms pyston 3.8.12
python 2.py 843ms 5.9ms 8.5MB 833ms 0ms pyston 3.8.12
python 1.py 1162ms 0.5ms 9.5MB 1150ms 0ms cpython 3.13.3
python 2.py 1336ms 11ms 9.1MB 1327ms 0ms cpython 3.13.3

Input: 1000 3000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
python 2.py 340ms 1.6ms 59.2MB 317ms 10ms pypy 3.10.16
python 1.py 379ms 2.4ms 60.4MB 353ms 13ms pypy 3.10.16
ocaml 1.ml 536ms 22ms 6.6MB 527ms 0ms ocaml 5.3.0
python 1.py 2141ms 9.4ms 8.9MB 2127ms 0ms pyston 3.8.12
python 2.py 2517ms 56ms 8.5MB 2507ms 0ms pyston 3.8.12
python 1.py 3461ms 59ms 9.5MB 3450ms 0ms cpython 3.13.3
python 2.py 3968ms 103ms 9.1MB 3957ms 0ms cpython 3.13.3

Input: 100 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 1.ml 77ms 1.7ms 5.9MB 70ms 0ms ocaml 5.3.0
python 2.py 105ms 0.4ms 58.2MB 80ms 10ms pypy 3.10.16
python 1.py 122ms 3.4ms 58.8MB 100ms 10ms pypy 3.10.16
python 1.py 349ms 0.5ms 8.5MB 340ms 0ms pyston 3.8.12
python 2.py 388ms 5.3ms 8.1MB 373ms 0ms pyston 3.8.12
python 1.py 561ms 4.3ms 9.3MB 547ms 0ms cpython 3.13.3
python 2.py 636ms 2.8ms 8.8MB 627ms 0ms cpython 3.13.3

merkletrees

Input: 17

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
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
python 1.py 2218ms 7.5ms 202.7MB 2107ms 100ms pypy 3.10.16
python 1.py timeout 0.0ms 94.0MB 4950ms 33ms cpython 3.13.3
python 1.py timeout 0.0ms 130.3MB 4933ms 50ms pyston 3.8.12

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
ocaml 2.ml 366ms 7.2ms 27.6MB 343ms 10ms ocaml 5.3.0
python 1.py 379ms 3.2ms 104.7MB 323ms 47ms pypy 3.10.16
python 1.py 3095ms 22ms 37.3MB 3067ms 10ms cpython 3.13.3
python 1.py timeout 0.0ms 48.9MB 4950ms 33ms pyston 3.8.12

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 1.ml 379ms 1.8ms 5.2MB 370ms 0ms ocaml 5.3.0
python 2.py 1353ms 3.9ms 58.1MB 1330ms 10ms pypy 3.10.16
python 1.py 2669ms 18ms 57.1MB 2643ms 10ms pypy 3.10.16
python 1.py timeout 0.0ms 8.9MB 4990ms 0ms cpython 3.13.3
python 2.py timeout 0.0ms 8.9MB 4987ms 0ms cpython 3.13.3
python 1.py timeout 0.0ms 8.3MB 4990ms 0ms pyston 3.8.12
python 2.py timeout 0.0ms 8.1MB 4983ms 0ms pyston 3.8.12

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 1.ml 41ms 1.5ms 5.3MB 30ms 0ms ocaml 5.3.0
python 2.py 177ms 1.3ms 58.1MB 157ms 10ms pypy 3.10.16
python 1.py 305ms 3.3ms 57.0MB 280ms 10ms pypy 3.10.16
python 1.py 928ms 11ms 8.3MB 917ms 0ms pyston 3.8.12
python 2.py 1294ms 2.1ms 8.1MB 1280ms 0ms pyston 3.8.12
python 1.py 2942ms 8.2ms 8.8MB 2930ms 0ms cpython 3.13.3
python 2.py 3274ms 97ms 8.9MB 3263ms 0ms cpython 3.13.3

nsieve

Input: 12

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
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
python 1.py 2512ms 35ms 369.6MB 2440ms 57ms pypy 3.10.16
python 2.py 2965ms 38ms 632.9MB 2797ms 153ms pyston 3.8.12
python 1.py 4719ms 55ms 320.4MB 4660ms 47ms pyston 3.8.12
python 1.py timeout 0.0ms 321.4MB 4957ms 30ms cpython 3.13.3
python 2.py timeout 0.0ms 633.8MB 4843ms 143ms cpython 3.13.3
python 2.py timeout 0.0ms 959.9MB 4710ms 280ms pypy 3.10.16

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
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
python 1.py 526ms 2.9ms 135.2MB 490ms 23ms pypy 3.10.16
python 2.py 713ms 3.4ms 164.2MB 670ms 30ms pyston 3.8.12
python 1.py 1069ms 35ms 86.0MB 1047ms 10ms pyston 3.8.12
python 2.py 1424ms 21ms 165.0MB 1380ms 30ms cpython 3.13.3
python 2.py 1518ms 19ms 290.3MB 1427ms 77ms pypy 3.10.16
python 1.py 2702ms 14ms 86.9MB 2680ms 10ms cpython 3.13.3

regex-redux

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
python 1.py 2256ms 13ms 242.7MB 2197ms 47ms pypy 3.10.16
python 1.py 4793ms 54ms 226.2MB 4607ms 173ms pyston 3.8.12
ocaml 2.ml timeout 0.0ms 462.8MB 4830ms 157ms ocaml 5.3.0
python 1.py timeout 0.0ms 149.2MB 4940ms 50ms cpython 3.13.3

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
python 1.py 339ms 2.5ms 86.1MB 300ms 30ms pypy 3.10.16
python 1.py 497ms 0.1ms 30.5MB 460ms 20ms pyston 3.8.12
ocaml 2.ml 549ms 15ms 57.1MB 513ms 23ms ocaml 5.3.0
python 1.py 610ms 7.4ms 29.9MB 583ms 13ms cpython 3.13.3

spectral-norm

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 2.ml 4567ms 9.8ms 6.3MB 4560ms 0ms ocaml 5.3.0
python 8.py timeout 0.0ms 14.9MB 37ms 10ms cpython 3.13.3
python 8.py timeout 0.0ms 95.9MB 810ms 90ms pypy 3.10.16
python 8.py timeout 0.0ms 14.1MB 30ms 13ms pyston 3.8.12

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 2.ml 1147ms 4.8ms 6.1MB 1137ms 0ms ocaml 5.3.0
python 8.py timeout 0.0ms 14.6MB 47ms 10ms cpython 3.13.3
python 8.py timeout 0.0ms 96.4MB 1343ms 187ms pypy 3.10.16
python 8.py timeout 0.0ms 13.6MB 57ms 10ms pyston 3.8.12

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 2.ml 295ms 7.0ms 5.2MB 287ms 0ms ocaml 5.3.0
python 8-m.py 1983ms 24ms 93.1MB 6417ms 257ms pypy 3.10.16
python 8.py timeout 0.0ms 14.3MB 87ms 23ms cpython 3.13.3
python 8.py timeout 0.0ms 13.4MB 140ms 33ms pyston 3.8.12