Programming Language and compiler
Benchmarks

OCaml VS Kotlin benchmarks

Current benchmark data was generated on Mon Jun 23 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
kotlin 1.kt 502ms 3.0ms 581.8MB 603ms 93ms kotlin/jvm 21
ocaml 1.ml 3028ms 44ms 157.2MB 2940ms 73ms ocaml 5.3.0
kotlin 1.kt 4205ms 55ms 144.8MB 4410ms 63ms kotlin/native 2.1.20

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1.kt 121ms 3.5ms 163.1MB 150ms 30ms kotlin/jvm 21
ocaml 1.ml 214ms 0.9ms 19.1MB 200ms 0ms ocaml 5.3.0
kotlin 1.kt 219ms 14ms 17.7MB 223ms 7ms kotlin/native 2.1.20

fannkuch-redux

Input: 11

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 2.ml 2914ms 16ms 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 3.3ms 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 1.7ms 24.8MB 337ms 0ms ocaml 5.3.0

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 6.ml 39ms 0.5ms 7.5MB 30ms 0ms ocaml 5.3.0

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 1.ml 1.8ms 0.2ms 5.0MB 0ms 0ms ocaml 5.3.0
kotlin 1.kt 2.1ms 0.1ms 3.0MB 0ms 0ms kotlin/native 2.1.20
kotlin 1-m.kt 62ms 0.8ms 47.8MB 78ms 18ms kotlin/jvm 21

lru

Input: 1000 1000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 2.kt 166ms 1.9ms 12.4MB 167ms 0ms kotlin/native 2.1.20
ocaml 1.ml 190ms 0.6ms 6.4MB 180ms 0ms ocaml 5.3.0
kotlin 1-m.kt 197ms 7.4ms 94.7MB 323ms 30ms kotlin/jvm 21
kotlin 2-m.kt 201ms 1.6ms 102.7MB 457ms 37ms kotlin/jvm 21
kotlin 1.kt 375ms 17ms 12.4MB 380ms 0ms kotlin/native 2.1.20

Input: 1000 3000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 2-m.kt 317ms 2.5ms 210.7MB 540ms 50ms kotlin/jvm 21
kotlin 1.kt 341ms 2.0ms 203.0MB 457ms 40ms kotlin/jvm 21
kotlin 2.kt 475ms 2.5ms 12.5MB 503ms 0ms kotlin/native 2.1.20
ocaml 1.ml 518ms 3.2ms 6.6MB 510ms 0ms ocaml 5.3.0
kotlin 1.kt 1046ms 1.8ms 12.5MB 1073ms 3ms kotlin/native 2.1.20

Input: 100 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 1.ml 77ms 1.4ms 5.9MB 70ms 0ms ocaml 5.3.0
kotlin 2.kt 95ms 0.1ms 12.8MB 87ms 0ms kotlin/native 2.1.20
kotlin 1.kt 122ms 1.1ms 12.8MB 117ms 0ms kotlin/native 2.1.20
kotlin 1-m.kt 153ms 4.0ms 92.4MB 293ms 27ms kotlin/jvm 21
kotlin 2-m.kt 170ms 16ms 95.9MB 367ms 37ms kotlin/jvm 21

merkletrees

Input: 17

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1.kt 394ms 11ms 680.4MB 447ms 93ms kotlin/jvm 21
ocaml 1.ml 1094ms 11ms 70.2MB 1047ms 30ms ocaml 5.3.0
kotlin 1.kt 1937ms 26ms 90.4MB 2023ms 40ms kotlin/native 2.1.20
ocaml 2.ml 2066ms 16ms 91.8MB 2013ms 33ms ocaml 5.3.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 1.ml 147ms 4.1ms 21.7MB 130ms 7ms ocaml 5.3.0
kotlin 1-m.kt 159ms 3.2ms 207.4MB 210ms 43ms kotlin/jvm 21
kotlin 1.kt 288ms 11ms 25.8MB 290ms 10ms kotlin/native 2.1.20
ocaml 2.ml 367ms 7.6ms 27.7MB 343ms 7ms ocaml 5.3.0

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1n.kt 354ms 2.9ms 3.6MB 343ms 0ms kotlin/native 2.1.20
ocaml 1.ml 373ms 1.9ms 5.2MB 360ms 0ms ocaml 5.3.0
kotlin 1.kt 444ms 1.3ms 49.7MB 487ms 20ms kotlin/jvm 21

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1n.kt 40ms 1.0ms 3.5MB 30ms 0ms kotlin/native 2.1.20
ocaml 1.ml 41ms 1.4ms 5.2MB 30ms 0ms ocaml 5.3.0
kotlin 1-m.kt 121ms 1.7ms 49.7MB 167ms 17ms kotlin/jvm 21

nsieve

Input: 12

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 1.ml 957ms 3.4ms 550.3MB 900ms 43ms ocaml 5.3.0
ocaml 2.ml 1886ms 14ms 18.9MB 1873ms 0ms ocaml 5.3.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 1.ml 191ms 3.0ms 141.6MB 170ms 10ms ocaml 5.3.0
ocaml 2.ml 471ms 4.3ms 9.1MB 460ms 0ms ocaml 5.3.0

regex-redux

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1.kt timeout 0.0ms 173.5MB 5417ms 50ms kotlin/jvm 21
kotlin 1n.kt timeout 0.0ms 226.8MB 5067ms 120ms kotlin/native 2.1.20
ocaml 2.ml timeout 0.0ms 462.9MB 4830ms 153ms ocaml 5.3.0

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 2.ml 549ms 4.5ms 57.1MB 513ms 23ms ocaml 5.3.0
kotlin 1-m.kt 828ms 9.1ms 134.4MB 1267ms 40ms kotlin/jvm 21
kotlin 1n.kt 3234ms 34ms 51.1MB 3313ms 80ms kotlin/native 2.1.20

spectral-norm

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 2.ml 4582ms 24ms 6.4MB 4570ms 0ms ocaml 5.3.0

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 2.ml 1159ms 5.5ms 6.1MB 1150ms 0ms ocaml 5.3.0

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 2.ml 294ms 4.6ms 5.2MB 283ms 0ms ocaml 5.3.0