Programming Language and compiler
Benchmarks

Wasm VS Swift benchmarks

Current benchmark data was generated on Sun Jul 13 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
wasm 5.rs 1739ms 5.1ms 34.0MB 1720ms 7ms wasmtime 34.0.1
wasm 4.rs 1815ms 23ms 34.1MB 1793ms 10ms wasmtime 34.0.1
wasm 3.rs 1852ms 9.2ms 50.0MB 1823ms 17ms wasmtime 34.0.1
swift 1.swift 2692ms 22ms 53.8MB 2657ms 20ms swift 6.1.2

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 5.rs 171ms 1.3ms 20.0MB 157ms 0ms wasmtime 34.0.1
wasm 4.rs 174ms 3.1ms 20.0MB 163ms 0ms wasmtime 34.0.1
wasm 3.rs 180ms 3.2ms 22.0MB 163ms 0ms wasmtime 34.0.1
swift 1.swift 240ms 0.7ms 11.9MB 230ms 0ms swift 6.1.2

coro-prime-sieve

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 3.rs 1098ms 7.8ms 20.3MB 1083ms 0ms wasmtime 34.0.1

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 3.rs 78ms 3.2ms 18.7MB 63ms 0ms wasmtime 34.0.1

edigits

Input: 250001

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 1.rs 420ms 3.1ms 19.6MB 407ms 0ms wasmtime 34.0.1

Input: 100000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 1.rs 114ms 1.7ms 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
swift 1.swift 2463ms 7.5ms 5.5MB 2453ms 0ms swift 6.1.2
wasm 1.rs 4157ms 18ms 17.8MB 4143ms 0ms wasmtime 34.0.1

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 1.swift 213ms 2.3ms 5.5MB 200ms 0ms swift 6.1.2
wasm 1.rs 349ms 4.0ms 17.7MB 337ms 0ms wasmtime 34.0.1

fasta

Input: 2500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 3-m.swift 139ms 1.6ms 20.7MB 400ms 3ms swift 6.1.2
wasm 1.rs 234ms 2.4ms 18.2MB 220ms 0ms wasmtime 34.0.1

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 1.rs 31ms 0.4ms 18.3MB 20ms 0ms wasmtime 34.0.1
swift 3.swift 37ms 0.3ms 14.2MB 30ms 0ms swift 6.1.2

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 1.swift 2.4ms 0.1ms 5.6MB 0ms 0ms swift 6.1.2
wasm 1.rs 6.7ms 0.5ms 18.2MB 0ms 0ms wasmtime 34.0.1

lru

Input: 1000 1000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 1.rs 91ms 1.1ms 18.2MB 80ms 0ms wasmtime 34.0.1

Input: 1000 3000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 1.rs 252ms 3.4ms 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
wasm 1.rs 46ms 0.9ms 17.7MB 37ms 0ms wasmtime 34.0.1

mandelbrot

Input: 5000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 8.rs 827ms 0.7ms 21.3MB 810ms 0ms wasmtime 34.0.1

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 8.rs 42ms 0.5ms 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
wasm 1.rs 870ms 7.8ms 42.1MB 847ms 10ms wasmtime 34.0.1

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 1.rs 192ms 2.6ms 24.1MB 177ms 0ms wasmtime 34.0.1

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 7.swift 346ms 2.1ms 9.9MB 337ms 0ms swift 6.1.2
wasm 1.rs 405ms 1.9ms 18.0MB 390ms 0ms wasmtime 34.0.1
wasm 2.rs 564ms 4.6ms 18.1MB 553ms 0ms wasmtime 34.0.1

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 7.swift 39ms 0.9ms 9.9MB 30ms 0ms swift 6.1.2
wasm 1.rs 47ms 0.1ms 18.1MB 37ms 0ms wasmtime 34.0.1
wasm 2.rs 65ms 1.7ms 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
wasm 2.rs 387ms 3.2ms 22.9MB 373ms 0ms wasmtime 34.0.1
wasm 1.rs 463ms 2.4ms 57.0MB 447ms 3ms wasmtime 34.0.1

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 1.rs 92ms 3.2ms 27.9MB 80ms 0ms wasmtime 34.0.1
wasm 2.rs 100ms 2.0ms 19.3MB 90ms 0ms wasmtime 34.0.1

pidigits

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 2.rs 2143ms 4.7ms 19.0MB 2127ms 0ms wasmtime 34.0.1
swift 1.swift timeout 0.0ms 7.3MB 4927ms 60ms swift 6.1.2

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 2.rs 506ms 0.5ms 18.3MB 490ms 0ms wasmtime 34.0.1
swift 1.swift 1865ms 11ms 7.0MB 1853ms 0ms swift 6.1.2

secp256k1

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 1.rs 3418ms 14ms 18.1MB 3407ms 0ms wasmtime 34.0.1

Input: 500

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 1.rs 866ms 6.0ms 17.8MB 853ms 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 3597ms 3.4ms 17.7MB 3583ms 0ms wasmtime 34.0.1
wasm 7.rs 4892ms 1.4ms 19.8MB 4880ms 0ms wasmtime 34.0.1

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 2.rs 906ms 1.0ms 18.3MB 893ms 0ms wasmtime 34.0.1
wasm 7.rs 1231ms 2.6ms 17.7MB 1217ms 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 0.9ms 17.8MB 220ms 0ms wasmtime 34.0.1
wasm 7.rs 314ms 0.5ms 18.1MB 300ms 0ms wasmtime 34.0.1