Programming Language and compiler
Benchmarks

OCaml VS Python 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
python 1.py 1165ms 6.5ms 96.8MB 1107ms 47ms pypy 3.11.13
ocaml 1.ml 3020ms 42ms 157.0MB 2927ms 77ms ocaml 5.3.0
python 1.py timeout 0.0ms 41.0MB 4967ms 23ms cpython 3.13.5
python 1.py timeout 0.0ms 40.5MB 4733ms 253ms pyston 3.8.12

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
python 1.py 95ms 3.5ms 68.3MB 63ms 17ms pypy 3.11.13
ocaml 1.ml 223ms 9.3ms 19.2MB 207ms 3ms ocaml 5.3.0
python 1.py 492ms 6.9ms 11.9MB 470ms 10ms pyston 3.8.12
python 1.py 734ms 16ms 12.9MB 723ms 0ms cpython 3.13.5

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
ocaml 6.ml 346ms 1.8ms 24.8MB 333ms 0ms ocaml 5.3.0
python 1.py 2215ms 30ms 89.2MB 2163ms 33ms pypy 3.11.13
python 5-m.py 2319ms 16ms 66.2MB 3547ms 837ms pypy 3.11.13
python 5-m.py 2445ms 19ms 12.5MB 3547ms 983ms pyston 3.8.12
python 1.py 3020ms 14ms 8.1MB 3007ms 0ms pyston 3.8.12
python 5-m.py 3347ms 16ms 13.8MB 4410ms 927ms cpython 3.13.5
python 1.py 4661ms 7.5ms 9.0MB 4647ms 0ms cpython 3.13.5

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 6.ml 39ms 0.4ms 7.3MB 30ms 0ms ocaml 5.3.0
python 1.py 279ms 1.4ms 63.5MB 250ms 10ms pypy 3.11.13
python 5-m.py 310ms 1.1ms 12.5MB 393ms 143ms pyston 3.8.12
python 1.py 313ms 2.4ms 8.1MB 303ms 0ms pyston 3.8.12
python 5-m.py 394ms 3.6ms 13.8MB 473ms 127ms cpython 3.13.5
python 5-m.py 448ms 1.8ms 66.2MB 763ms 273ms pypy 3.11.13
python 1.py 491ms 9.3ms 8.9MB 480ms 0ms cpython 3.13.5

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 0.9ms 7.8MB 0ms 0ms pyston 3.8.12
python 1.py 13ms 0.8ms 8.8MB 0ms 0ms cpython 3.13.5
python 1.py 29ms 0.8ms 52.2MB 10ms 10ms pypy 3.11.13

lru

Input: 1000 1000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
python 2.py 148ms 2.3ms 58.9MB 123ms 7ms pypy 3.11.13
python 1.py 187ms 5.0ms 59.8MB 163ms 10ms pypy 3.11.13
ocaml 1.ml 187ms 2.5ms 6.4MB 180ms 0ms ocaml 5.3.0
python 1.py 734ms 3.0ms 8.9MB 717ms 0ms pyston 3.8.12
python 2.py 857ms 2.7ms 8.5MB 847ms 0ms pyston 3.8.12
python 1.py 1149ms 2.1ms 9.5MB 1140ms 0ms cpython 3.13.5
python 2.py 1312ms 22ms 9.3MB 1300ms 0ms cpython 3.13.5

Input: 1000 3000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
python 2.py 349ms 5.1ms 59.7MB 320ms 13ms pypy 3.11.13
python 1.py 399ms 2.9ms 60.7MB 373ms 10ms pypy 3.11.13
ocaml 1.ml 537ms 13ms 6.6MB 523ms 0ms ocaml 5.3.0
python 1.py 2181ms 1.1ms 8.9MB 2170ms 0ms pyston 3.8.12
python 2.py 2527ms 6.0ms 8.5MB 2513ms 0ms pyston 3.8.12
python 1.py 3381ms 12ms 9.5MB 3373ms 0ms cpython 3.13.5
python 2.py 3934ms 57ms 9.3MB 3923ms 0ms cpython 3.13.5

Input: 100 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 1.ml 75ms 0.2ms 5.9MB 67ms 0ms ocaml 5.3.0
python 2.py 106ms 3.8ms 58.1MB 83ms 10ms pypy 3.11.13
python 1.py 122ms 3.9ms 59.3MB 103ms 10ms pypy 3.11.13
python 1.py 357ms 3.8ms 8.5MB 347ms 0ms pyston 3.8.12
python 2.py 391ms 3.4ms 8.1MB 383ms 0ms pyston 3.8.12
python 1.py 540ms 3.8ms 9.3MB 527ms 0ms cpython 3.13.5
python 2.py 631ms 12ms 8.9MB 620ms 0ms cpython 3.13.5

merkletrees

Input: 17

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
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
python 1.py 2182ms 14ms 204.7MB 2060ms 107ms pypy 3.11.13
python 1.py timeout 0.0ms 94.1MB 4957ms 33ms cpython 3.13.5
python 1.py timeout 0.0ms 130.4MB 4937ms 53ms pyston 3.8.12

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
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
python 1.py 375ms 1.4ms 105.3MB 317ms 43ms pypy 3.11.13
python 1.py 3001ms 36ms 37.4MB 2973ms 13ms cpython 3.13.5
python 1.py timeout 0.0ms 48.9MB 4940ms 47ms pyston 3.8.12

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 1.ml 373ms 2.9ms 5.2MB 363ms 0ms ocaml 5.3.0
python 2.py 1342ms 2.7ms 60.5MB 1317ms 13ms pypy 3.11.13
python 1.py 2650ms 17ms 57.8MB 2627ms 10ms pypy 3.11.13
python 1.py timeout 0.0ms 8.9MB 4990ms 0ms cpython 3.13.5
python 2.py timeout 0.0ms 9.0MB 4990ms 0ms cpython 3.13.5
python 1.py timeout 0.0ms 8.3MB 4990ms 0ms pyston 3.8.12
python 2.py timeout 0.0ms 8.1MB 4990ms 0ms pyston 3.8.12

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 1.ml 42ms 0.9ms 5.3MB 30ms 0ms ocaml 5.3.0
python 2.py 176ms 4.7ms 58.5MB 153ms 10ms pypy 3.11.13
python 1.py 305ms 1.6ms 57.8MB 283ms 7ms pypy 3.11.13
python 1.py 940ms 29ms 8.3MB 927ms 0ms pyston 3.8.12
python 2.py 1345ms 52ms 8.1MB 1330ms 0ms pyston 3.8.12
python 1.py 2971ms 99ms 8.9MB 2960ms 0ms cpython 3.13.5
python 2.py 2989ms 51ms 9.0MB 2977ms 0ms cpython 3.13.5

nsieve

Input: 12

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
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
python 1.py 2403ms 56ms 369.9MB 2330ms 57ms pypy 3.11.13
python 2.py 2979ms 17ms 633.0MB 2793ms 170ms pyston 3.8.12
python 1.py 4806ms 156ms 320.4MB 4743ms 47ms pyston 3.8.12
python 1.py timeout 0.0ms 321.4MB 4960ms 20ms cpython 3.13.5
python 2.py timeout 0.0ms 633.8MB 4827ms 160ms cpython 3.13.5
python 2.py timeout 0.0ms 1017.7MB 4707ms 280ms pypy 3.11.13

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
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
python 1.py 503ms 12ms 135.7MB 463ms 23ms pypy 3.11.13
python 2.py 726ms 6.1ms 164.2MB 683ms 30ms pyston 3.8.12
python 1.py 1068ms 11ms 86.0MB 1040ms 10ms pyston 3.8.12
python 2.py 1370ms 7.2ms 165.1MB 1327ms 30ms cpython 3.13.5
python 2.py 1392ms 15ms 290.8MB 1303ms 73ms pypy 3.11.13
python 1.py 2819ms 6.7ms 87.0MB 2793ms 10ms cpython 3.13.5

regex-redux

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
python 1.py 2244ms 7.2ms 245.8MB 2183ms 43ms pypy 3.11.13
python 1.py 4754ms 9.8ms 226.2MB 4570ms 170ms pyston 3.8.12
ocaml 2.ml timeout 0.0ms 462.8MB 4823ms 167ms ocaml 5.3.0
python 1.py timeout 0.0ms 137.9MB 4930ms 53ms cpython 3.13.5

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
python 1.py 333ms 7.5ms 87.3MB 290ms 30ms pypy 3.11.13
python 1.py 497ms 1.8ms 30.3MB 463ms 20ms pyston 3.8.12
ocaml 2.ml 549ms 3.2ms 57.1MB 510ms 23ms ocaml 5.3.0
python 1.py 617ms 0.3ms 30.0MB 587ms 17ms cpython 3.13.5

spectral-norm

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 2.ml 4574ms 4.7ms 6.4MB 4563ms 0ms ocaml 5.3.0
python 8.py timeout 0.0ms 14.8MB 40ms 10ms cpython 3.13.5
python 8.py timeout 0.0ms 94.2MB 653ms 73ms pypy 3.11.13
python 8.py timeout 0.0ms 14.3MB 40ms 10ms pyston 3.8.12

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 2.ml 1166ms 5.8ms 5.9MB 1153ms 0ms ocaml 5.3.0
python 8.py timeout 0.0ms 14.4MB 50ms 7ms cpython 3.13.5
python 8.py timeout 0.0ms 96.2MB 1180ms 140ms pypy 3.11.13
python 8.py timeout 0.0ms 13.6MB 63ms 13ms pyston 3.8.12

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 2.ml 295ms 3.8ms 5.2MB 283ms 0ms ocaml 5.3.0
python 8-m.py 2147ms 28ms 94.2MB 7087ms 240ms pypy 3.11.13
python 8.py timeout 0.0ms 14.3MB 90ms 13ms cpython 3.13.5
python 8.py timeout 0.0ms 13.1MB 133ms 37ms pyston 3.8.12