Programming Language and compiler
Benchmarks

Wasm VS Crystal benchmarks

Current benchmark data was generated on Tue Jul 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 1302ms 4.1ms 64.2MB 1273ms 17ms crystal 1.16.3
wasm 5.rs 1766ms 30ms 36.0MB 1747ms 7ms wasmtime 34.0.1
wasm 4.rs 1838ms 15ms 34.0MB 1817ms 10ms wasmtime 34.0.1
wasm 3.rs 1880ms 33ms 50.0MB 1850ms 13ms wasmtime 34.0.1

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 109ms 2.8ms 11.0MB 100ms 0ms crystal 1.16.3
wasm 5.rs 167ms 1.1ms 20.1MB 150ms 0ms wasmtime 34.0.1
wasm 4.rs 174ms 1.7ms 20.0MB 160ms 3ms wasmtime 34.0.1
wasm 3.rs 179ms 2.1ms 22.1MB 163ms 0ms wasmtime 34.0.1

coro-prime-sieve

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 3.rs 1111ms 16ms 20.4MB 1100ms 0ms wasmtime 34.0.1
crystal 1.cr 1515ms 15ms 19.9MB 1450ms 53ms crystal 1.16.3

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 3.rs 77ms 0.4ms 19.1MB 67ms 0ms wasmtime 34.0.1
crystal 1.cr 86ms 1.0ms 7.1MB 60ms 10ms crystal 1.16.3

edigits

Input: 250001

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 58ms 0.7ms 7.5MB 43ms 0ms crystal 1.16.3
wasm 1.rs 419ms 6.5ms 19.5MB 403ms 0ms wasmtime 34.0.1

Input: 100000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 23ms 1.3ms 5.3MB 10ms 0ms crystal 1.16.3
wasm 1.rs 113ms 0.1ms 19.0MB 100ms 0ms wasmtime 34.0.1

fannkuch-redux

Input: 11

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 2487ms 23ms 2.9MB 2473ms 0ms crystal 1.16.3
wasm 1.rs 4201ms 47ms 18.3MB 4190ms 0ms wasmtime 34.0.1

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 205ms 3.6ms 2.9MB 197ms 0ms crystal 1.16.3
wasm 1.rs 349ms 0.3ms 18.3MB 337ms 0ms wasmtime 34.0.1

fasta

Input: 2500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 1.rs 235ms 3.7ms 18.2MB 220ms 0ms wasmtime 34.0.1
crystal 2.cr 535ms 2.4ms 3.5MB 450ms 70ms crystal 1.16.3
crystal 1.cr 681ms 3.2ms 14.6MB 570ms 97ms crystal 1.16.3

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 1.rs 32ms 1.2ms 18.2MB 20ms 0ms wasmtime 34.0.1
crystal 2.cr 58ms 1.8ms 3.6MB 40ms 7ms crystal 1.16.3
crystal 1.cr 72ms 0.7ms 4.9MB 53ms 7ms crystal 1.16.3

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 2.0ms 0.1ms 2.9MB 0ms 0ms crystal 1.16.3
wasm 1.rs 6.7ms 0.5ms 18.3MB 0ms 0ms wasmtime 34.0.1

lru

Input: 1000 1000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 0-unsafe.cr 36ms 0.7ms 3.0MB 30ms 0ms crystal 1.16.3
crystal 1.cr 65ms 1.5ms 3.0MB 57ms 0ms crystal 1.16.3
wasm 1.rs 90ms 1.3ms 18.5MB 80ms 0ms wasmtime 34.0.1

Input: 1000 3000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 0-unsafe.cr 102ms 0.4ms 3.0MB 90ms 0ms crystal 1.16.3
crystal 1.cr 189ms 6.6ms 3.0MB 177ms 0ms crystal 1.16.3
wasm 1.rs 253ms 2.7ms 17.9MB 240ms 0ms wasmtime 34.0.1

Input: 100 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 0-unsafe.cr 18ms 0.7ms 3.0MB 10ms 0ms crystal 1.16.3
crystal 1.cr 30ms 1.5ms 3.0MB 20ms 0ms crystal 1.16.3
wasm 1.rs 47ms 1.0ms 17.7MB 33ms 0ms wasmtime 34.0.1

mandelbrot

Input: 5000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 315ms 1.4ms 9.3MB 303ms 0ms crystal 1.16.3
wasm 8.rs 828ms 2.0ms 21.5MB 817ms 0ms wasmtime 34.0.1

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 17ms 0.4ms 6.4MB 10ms 0ms crystal 1.16.3
wasm 8.rs 43ms 0.2ms 18.4MB 30ms 0ms wasmtime 34.0.1

merkletrees

Input: 17

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 867ms 21ms 64.2MB 843ms 10ms crystal 1.16.3
wasm 1.rs 886ms 12ms 44.1MB 863ms 10ms wasmtime 34.0.1

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 174ms 3.9ms 22.3MB 157ms 0ms crystal 1.16.3
wasm 1.rs 193ms 1.1ms 24.1MB 177ms 3ms wasmtime 34.0.1

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 2.cr 342ms 2.4ms 3.3MB 333ms 0ms crystal 1.16.3
crystal 1.cr 350ms 6.8ms 3.4MB 343ms 0ms crystal 1.16.3
wasm 1.rs 404ms 3.4ms 18.0MB 390ms 0ms wasmtime 34.0.1
wasm 2.rs 562ms 0.4ms 18.3MB 550ms 0ms wasmtime 34.0.1

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 38ms 1.2ms 3.3MB 30ms 0ms crystal 1.16.3
crystal 2.cr 38ms 0.4ms 3.4MB 30ms 0ms crystal 1.16.3
wasm 1.rs 49ms 1.1ms 18.1MB 37ms 0ms wasmtime 34.0.1
wasm 2.rs 65ms 1.1ms 18.1MB 50ms 0ms wasmtime 34.0.1

nsieve

Input: 12

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 2.cr 348ms 2.9ms 8.3MB 337ms 0ms crystal 1.16.3
wasm 2.rs 391ms 3.6ms 23.0MB 377ms 0ms wasmtime 34.0.1
crystal 1.cr 422ms 6.9ms 43.0MB 413ms 0ms crystal 1.16.3
wasm 1.rs 526ms 14ms 57.2MB 510ms 0ms wasmtime 34.0.1

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 2.cr 87ms 1.4ms 4.5MB 80ms 0ms crystal 1.16.3
crystal 1.cr 90ms 3.2ms 13.2MB 83ms 0ms crystal 1.16.3
wasm 1.rs 94ms 2.6ms 27.8MB 80ms 0ms wasmtime 34.0.1
wasm 2.rs 100ms 2.9ms 19.5MB 90ms 0ms wasmtime 34.0.1

pidigits

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 1981ms 59ms 6.2MB 1957ms 13ms crystal 1.16.3
wasm 2.rs 2137ms 4.5ms 19.2MB 2123ms 0ms wasmtime 34.0.1

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 456ms 13ms 5.0MB 440ms 0ms crystal 1.16.3
wasm 2.rs 509ms 3.9ms 18.3MB 493ms 0ms wasmtime 34.0.1

secp256k1

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 1.rs 3428ms 13ms 17.9MB 3413ms 0ms wasmtime 34.0.1

Input: 500

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 1.rs 880ms 8.0ms 18.5MB 867ms 0ms wasmtime 34.0.1

spectral-norm

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 2.rs 3600ms 5.7ms 18.3MB 3587ms 0ms wasmtime 34.0.1
crystal 1.cr 3763ms 15ms 4.6MB 3753ms 0ms crystal 1.16.3
wasm 7.rs 4895ms 4.2ms 18.3MB 4883ms 0ms wasmtime 34.0.1

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 2.rs 907ms 0.5ms 17.7MB 893ms 0ms wasmtime 34.0.1
crystal 1.cr 946ms 8.1ms 4.4MB 933ms 0ms crystal 1.16.3
wasm 7.rs 1230ms 1.2ms 17.7MB 1220ms 0ms wasmtime 34.0.1

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 2.rs 234ms 1.4ms 17.6MB 220ms 0ms wasmtime 34.0.1
crystal 1.cr 244ms 2.8ms 3.9MB 237ms 0ms crystal 1.16.3
wasm 7.rs 316ms 0.4ms 18.1MB 303ms 0ms wasmtime 34.0.1