Programming Language and compiler
Benchmarks

Nim VS Wasm 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
nim 2.nim 825ms 37ms 34.9MB 807ms 7ms nim 2.2.4
nim 2.nim 999ms 22ms 34.7MB 980ms 7ms nim/clang 2.2.4
wasm 5.rs 1914ms 16ms 35.7MB 1893ms 10ms wasmtime 34.0.0
wasm 4.rs 1932ms 53ms 33.7MB 1910ms 10ms wasmtime 34.0.0
wasm 3.rs 1979ms 111ms 50.0MB 1950ms 20ms wasmtime 34.0.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 77ms 1.9ms 5.5MB 67ms 0ms nim 2.2.4
nim 2.nim 93ms 2.8ms 5.8MB 83ms 0ms nim/clang 2.2.4
wasm 5.rs 172ms 1.4ms 19.8MB 157ms 0ms wasmtime 34.0.0
wasm 4.rs 174ms 2.0ms 19.8MB 163ms 0ms wasmtime 34.0.0
wasm 3.rs 181ms 4.1ms 21.7MB 163ms 0ms wasmtime 34.0.0

coro-prime-sieve

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 3.rs 1130ms 4.9ms 20.1MB 1113ms 7ms wasmtime 34.0.0
nim 1.nim timeout 0.0ms 568.3MB 2650ms 1870ms nim 2.2.4
nim 1.nim timeout 0.0ms 572.7MB 2573ms 1947ms nim/clang 2.2.4

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 3.rs 80ms 1.0ms 18.6MB 70ms 0ms wasmtime 34.0.0
nim 1.nim 4147ms 10.0ms 519.8MB 2113ms 1603ms nim/clang 2.2.4
nim 1.nim 4190ms 13ms 518.2MB 2160ms 1600ms nim 2.2.4

fasta

Input: 2500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 188ms 2.2ms 1.5MB 180ms 0ms nim 2.2.4
wasm 1.rs 234ms 1.9ms 19.6MB 220ms 0ms wasmtime 34.0.0
nim 2.nim 240ms 0.1ms 1.8MB 230ms 0ms nim/clang 2.2.4
nim 1.nim 542ms 2.9ms 1.9MB 450ms 80ms nim/clang 2.2.4
nim 1.nim 561ms 3.3ms 1.5MB 470ms 77ms nim 2.2.4

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 21ms 0.1ms 1.5MB 10ms 0ms nim 2.2.4
nim 2.nim 27ms 1.0ms 1.8MB 20ms 0ms nim/clang 2.2.4
wasm 1.rs 32ms 0.8ms 17.7MB 20ms 0ms wasmtime 34.0.0
nim 1.nim 57ms 0.5ms 1.8MB 37ms 3ms nim/clang 2.2.4
nim 1.nim 59ms 0.6ms 1.5MB 40ms 7ms nim 2.2.4

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 1.0ms 0.0ms 1.6MB 0ms 0ms nim 2.2.4
nim 1.nim 1.1ms 0.0ms 1.9MB 0ms 0ms nim/clang 2.2.4
wasm 1.rs 7.1ms 0.1ms 16.7MB 0ms 0ms wasmtime 34.0.0

lru

Input: 1000 1000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 1.rs 93ms 2.2ms 18.2MB 80ms 0ms wasmtime 34.0.0
nim 2.nim 113ms 2.8ms 1.8MB 107ms 0ms nim/clang 2.2.4
nim 2.nim 116ms 1.5ms 1.4MB 110ms 0ms nim 2.2.4
nim 1.nim timeout 0.0ms 1.3MB 4990ms 0ms nim 2.2.4
nim 1.nim timeout 0.0ms 1.5MB 4990ms 0ms nim/clang 2.2.4

Input: 1000 3000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
wasm 1.rs 255ms 1.5ms 17.7MB 240ms 0ms wasmtime 34.0.0
nim 2.nim 328ms 6.2ms 1.6MB 317ms 0ms nim/clang 2.2.4
nim 2.nim 336ms 4.0ms 1.4MB 330ms 0ms nim 2.2.4
nim 1.nim timeout 0.0ms 1.3MB 4990ms 0ms nim 2.2.4
nim 1.nim timeout 0.0ms 1.5MB 4990ms 0ms nim/clang 2.2.4

Input: 100 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 48ms 0.0ms 1.8MB 40ms 0ms nim/clang 2.2.4
wasm 1.rs 48ms 0.7ms 17.9MB 40ms 0ms wasmtime 34.0.0
nim 2.nim 50ms 0.4ms 1.3MB 40ms 0ms nim 2.2.4
nim 1.nim 478ms 6.6ms 1.5MB 470ms 0ms nim/clang 2.2.4
nim 1.nim 483ms 14ms 1.3MB 477ms 0ms nim 2.2.4

mandelbrot

Input: 5000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 389ms 0.9ms 4.8MB 380ms 0ms nim/clang 2.2.4
nim 1.nim 577ms 4.1ms 4.5MB 563ms 0ms nim 2.2.4
wasm 8.rs 832ms 1.4ms 21.1MB 820ms 0ms wasmtime 34.0.0

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 19ms 0.7ms 1.9MB 10ms 0ms nim/clang 2.2.4
nim 1.nim 26ms 0.4ms 1.6MB 20ms 0ms nim 2.2.4
wasm 8.rs 44ms 1.0ms 18.2MB 30ms 0ms wasmtime 34.0.0

merkletrees

Input: 17

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 568ms 19ms 34.9MB 550ms 3ms nim 2.2.4
nim 1.nim 633ms 12ms 34.2MB 617ms 3ms nim/clang 2.2.4
wasm 1.rs 903ms 21ms 41.8MB 877ms 10ms wasmtime 34.0.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 119ms 2.4ms 9.6MB 107ms 0ms nim 2.2.4
nim 1.nim 138ms 2.2ms 9.9MB 127ms 0ms nim/clang 2.2.4
wasm 1.rs 196ms 4.9ms 23.8MB 180ms 0ms wasmtime 34.0.0

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 321ms 2.4ms 1.8MB 310ms 0ms nim 2.2.4
nim 2.nim 344ms 1.2ms 1.9MB 330ms 0ms nim/clang 2.2.4
wasm 1.rs 404ms 1.2ms 17.7MB 390ms 0ms wasmtime 34.0.0
wasm 2.rs 562ms 1.1ms 17.8MB 550ms 0ms wasmtime 34.0.0

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 34ms 0.6ms 1.8MB 30ms 0ms nim 2.2.4
nim 2.nim 38ms 1.4ms 2.0MB 30ms 0ms nim/clang 2.2.4
wasm 1.rs 49ms 0.5ms 17.9MB 37ms 0ms wasmtime 34.0.0
wasm 2.rs 66ms 1.6ms 18.0MB 50ms 0ms wasmtime 34.0.0

nsieve

Input: 12

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 306ms 36ms 41.5MB 297ms 0ms nim 2.2.4
nim 1.nim 334ms 13ms 41.8MB 323ms 0ms nim/clang 2.2.4
wasm 2.rs 381ms 1.9ms 22.9MB 367ms 0ms wasmtime 34.0.0
wasm 1.rs 613ms 42ms 56.9MB 597ms 10ms wasmtime 34.0.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 51ms 1.1ms 11.5MB 40ms 0ms nim 2.2.4
nim 1.nim 67ms 7.6ms 11.8MB 60ms 0ms nim/clang 2.2.4
wasm 1.rs 95ms 0.7ms 27.6MB 80ms 0ms wasmtime 34.0.0
wasm 2.rs 98ms 1.0ms 20.9MB 87ms 0ms wasmtime 34.0.0

regex-redux

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 1646ms 3.9ms 152.4MB 1610ms 23ms nim/clang 2.2.4
nim 1.nim 1674ms 7.4ms 151.5MB 1640ms 20ms nim 2.2.4

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 174ms 3.1ms 17.6MB 160ms 0ms nim/clang 2.2.4
nim 1.nim 178ms 1.7ms 17.4MB 160ms 0ms nim 2.2.4

spectral-norm

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 3589ms 1.4ms 2.0MB 3580ms 0ms nim/clang 2.2.4
nim 1.nim 3601ms 3.5ms 1.4MB 3593ms 0ms nim 2.2.4
wasm 2.rs 3609ms 13ms 17.7MB 3590ms 0ms wasmtime 34.0.0
wasm 7.rs 4900ms 13ms 17.7MB 4887ms 0ms wasmtime 34.0.0

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 899ms 0.7ms 1.5MB 890ms 0ms nim/clang 2.2.4
nim 1.nim 903ms 1.2ms 1.3MB 893ms 0ms nim 2.2.4
wasm 2.rs 908ms 2.9ms 19.5MB 893ms 0ms wasmtime 34.0.0
wasm 7.rs 1231ms 2.5ms 18.1MB 1220ms 0ms wasmtime 34.0.0

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 227ms 0.4ms 1.5MB 220ms 0ms nim/clang 2.2.4
nim 1.nim 228ms 1.8ms 1.3MB 220ms 0ms nim 2.2.4
wasm 2.rs 234ms 0.4ms 17.8MB 220ms 0ms wasmtime 34.0.0
wasm 7.rs 316ms 2.7ms 17.4MB 300ms 0ms wasmtime 34.0.0