Programming Language and compiler
Benchmarks

Crystal VS OCaml benchmarks

Current benchmark data was generated on Thu May 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
crystal 1.cr 1235ms 5.9ms 64.2MB 1210ms 10ms crystal 1.16.2
ocaml 1.ml 3316ms 13ms 157.1MB 3237ms 67ms ocaml 5.3.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 107ms 1.5ms 11.0MB 93ms 0ms crystal 1.16.2
ocaml 1.ml 247ms 3.4ms 19.1MB 233ms 0ms ocaml 5.3.0

coro-prime-sieve

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 1514ms 13ms 19.9MB 1450ms 53ms crystal 1.16.2

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 85ms 1.3ms 7.1MB 63ms 10ms crystal 1.16.2

edigits

Input: 250001

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 57ms 0.6ms 6.4MB 40ms 0ms crystal 1.16.2

Input: 100000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 23ms 1.1ms 5.1MB 10ms 0ms crystal 1.16.2

fannkuch-redux

Input: 11

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 2480ms 8.8ms 2.9MB 2470ms 0ms crystal 1.16.2
ocaml 2.ml 2912ms 1.6ms 4.9MB 2900ms 0ms ocaml 5.3.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 206ms 3.4ms 2.9MB 197ms 0ms crystal 1.16.2
ocaml 2.ml 244ms 1.2ms 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 345ms 1.2ms 24.8MB 330ms 0ms ocaml 5.3.0
crystal 2.cr 550ms 2.8ms 3.5MB 447ms 90ms crystal 1.16.2
crystal 1.cr 694ms 0.9ms 14.6MB 577ms 103ms crystal 1.16.2

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 6.ml 38ms 0.9ms 7.5MB 30ms 0ms ocaml 5.3.0
crystal 2.cr 58ms 0.8ms 3.6MB 40ms 3ms crystal 1.16.2
crystal 1.cr 75ms 0.4ms 4.9MB 50ms 10ms crystal 1.16.2

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 1.ml 1.7ms 0.2ms 5.0MB 0ms 0ms ocaml 5.3.0
crystal 1.cr 1.9ms 0.1ms 2.9MB 0ms 0ms crystal 1.16.2

http-server

Input: 3000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 2259ms 358ms 211.1MB 313ms 487ms crystal 1.16.2

Input: 500

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 1184ms 99ms 54.9MB 33ms 83ms crystal 1.16.2

lru

Input: 1000 1000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 0-unsafe.cr 37ms 0.6ms 3.0MB 30ms 0ms crystal 1.16.2
crystal 1.cr 65ms 1.4ms 3.0MB 57ms 0ms crystal 1.16.2
ocaml 1.ml 180ms 3.9ms 6.4MB 167ms 0ms ocaml 5.3.0

Input: 1000 3000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 0-unsafe.cr 99ms 0.9ms 3.0MB 90ms 0ms crystal 1.16.2
crystal 1.cr 187ms 2.0ms 3.0MB 180ms 0ms crystal 1.16.2
ocaml 1.ml 539ms 20ms 6.6MB 530ms 0ms ocaml 5.3.0

Input: 100 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 0-unsafe.cr 17ms 0.3ms 3.0MB 10ms 0ms crystal 1.16.2
crystal 1.cr 30ms 1.3ms 3.0MB 20ms 0ms crystal 1.16.2
ocaml 1.ml 77ms 1.5ms 5.9MB 70ms 0ms ocaml 5.3.0

mandelbrot

Input: 5000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 314ms 1.1ms 9.3MB 300ms 0ms crystal 1.16.2

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 17ms 0.4ms 5.6MB 10ms 0ms crystal 1.16.2

merkletrees

Input: 17

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 846ms 6.4ms 64.2MB 823ms 10ms crystal 1.16.2
ocaml 1.ml 1072ms 7.8ms 70.2MB 1030ms 23ms ocaml 5.3.0
ocaml 2.ml 2063ms 33ms 91.7MB 2003ms 47ms ocaml 5.3.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ocaml 1.ml 144ms 1.3ms 21.6MB 130ms 3ms ocaml 5.3.0
crystal 1.cr 175ms 0.8ms 22.2MB 160ms 0ms crystal 1.16.2
ocaml 2.ml 352ms 1.6ms 27.7MB 333ms 7ms ocaml 5.3.0

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 343ms 0.7ms 3.3MB 330ms 0ms crystal 1.16.2
crystal 2.cr 344ms 2.9ms 3.3MB 333ms 0ms crystal 1.16.2
ocaml 1.ml 372ms 2.6ms 5.2MB 363ms 0ms ocaml 5.3.0

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 2.cr 37ms 0.5ms 3.3MB 30ms 0ms crystal 1.16.2
crystal 1.cr 38ms 1.1ms 3.3MB 30ms 0ms crystal 1.16.2
ocaml 1.ml 40ms 0.0ms 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
crystal 2.cr 348ms 4.1ms 8.3MB 340ms 0ms crystal 1.16.2
crystal 1.cr 427ms 4.1ms 43.0MB 413ms 0ms crystal 1.16.2
ocaml 1.ml 955ms 5.3ms 552.0MB 893ms 43ms ocaml 5.3.0
ocaml 2.ml 1880ms 9.6ms 17.1MB 1867ms 0ms ocaml 5.3.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 2.cr 88ms 2.4ms 4.5MB 80ms 0ms crystal 1.16.2
crystal 1.cr 89ms 0.3ms 13.2MB 80ms 0ms crystal 1.16.2
ocaml 1.ml 185ms 5.7ms 139.6MB 163ms 10ms ocaml 5.3.0
ocaml 2.ml 469ms 4.3ms 9.1MB 457ms 0ms ocaml 5.3.0

pidigits

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 1973ms 67ms 6.3MB 1947ms 17ms crystal 1.16.2

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 457ms 15ms 5.1MB 443ms 0ms crystal 1.16.2

spectral-norm

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 3764ms 9.2ms 4.6MB 3750ms 0ms crystal 1.16.2
ocaml 2.ml 4563ms 8.7ms 6.4MB 4553ms 0ms ocaml 5.3.0

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 950ms 8.9ms 4.4MB 940ms 0ms crystal 1.16.2
ocaml 2.ml 1146ms 6.2ms 6.1MB 1137ms 0ms ocaml 5.3.0

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 241ms 2.8ms 3.9MB 230ms 0ms crystal 1.16.2
ocaml 2.ml 293ms 2.5ms 5.2MB 283ms 0ms ocaml 5.3.0