Programming Language and compiler
Benchmarks

Nim VS C# benchmarks

Current benchmark data was generated on Mon Mar 31 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
csharp 1.cs 909ms 8.6ms 192.3MB 903ms 150ms dotnet 9.0.202
nim 2.nim 951ms 22ms 34.6MB 933ms 0ms nim 2.2.2
csharp 1.cs 978ms 14ms 172.2MB 970ms 130ms dotnet/aot 9.0.202
nim 2.nim 1044ms 46ms 34.9MB 1030ms 0ms nim/clang 2.2.2
csharp 1.cs 1684ms 30ms 107.4MB 1873ms 210ms mono 6.12.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 91ms 1.0ms 5.5MB 80ms 0ms nim 2.2.2
nim 2.nim 92ms 1.1ms 5.8MB 80ms 0ms nim/clang 2.2.2
csharp 1.cs 120ms 7.8ms 31.5MB 93ms 27ms dotnet/aot 9.0.202
csharp 1.cs 142ms 0.8ms 44.3MB 120ms 13ms mono 6.12.0
csharp 1.cs 190ms 1.3ms 50.5MB 147ms 40ms dotnet 9.0.202

coro-prime-sieve

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 1-m.cs 2152ms 52ms 50.1MB 7543ms 63ms dotnet/aot 9.0.202
csharp 1-m.cs 2722ms 77ms 73.0MB 8447ms 103ms dotnet 9.0.202
nim 1.nim timeout 0.0ms 553.5MB 2527ms 2017ms nim 2.2.2
nim 1.nim timeout 0.0ms 555.8MB 2507ms 2037ms nim/clang 2.2.2

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 1-m.cs 154ms 11ms 18.7MB 453ms 13ms dotnet/aot 9.0.202
csharp 1-m.cs 288ms 24ms 37.3MB 797ms 23ms dotnet 9.0.202
nim 1.nim 4347ms 12ms 519.8MB 2150ms 1773ms nim/clang 2.2.2
nim 1.nim 4379ms 10ms 519.4MB 2190ms 1760ms nim 2.2.2

fasta

Input: 2500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 5-m.cs 125ms 3.8ms 22.3MB 357ms 80ms dotnet/aot 9.0.202
nim 2.nim 189ms 2.4ms 1.5MB 177ms 0ms nim 2.2.2
csharp 5-m.cs 226ms 19ms 44.3MB 470ms 120ms dotnet 9.0.202
csharp 5-m.cs 231ms 6.2ms 46.4MB 667ms 87ms mono 6.12.0
nim 2.nim 237ms 2.8ms 1.8MB 227ms 0ms nim/clang 2.2.2
nim 1.nim 553ms 0.6ms 1.8MB 447ms 90ms nim/clang 2.2.2
nim 1.nim 579ms 2.1ms 1.5MB 477ms 87ms nim 2.2.2

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 21ms 0.0ms 1.5MB 10ms 0ms nim 2.2.2
csharp 5-m.cs 24ms 0.7ms 15.6MB 30ms 10ms dotnet/aot 9.0.202
nim 2.nim 26ms 0.2ms 1.8MB 20ms 0ms nim/clang 2.2.2
nim 1.nim 59ms 1.2ms 1.8MB 40ms 10ms nim/clang 2.2.2
nim 1.nim 61ms 0.5ms 1.5MB 40ms 7ms nim 2.2.2
csharp 5-m.cs 64ms 5.1ms 37.0MB 87ms 17ms dotnet 9.0.202
csharp 5-m.cs 72ms 1.6ms 29.1MB 107ms 17ms mono 6.12.0

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 1.1ms 0.0ms 1.5MB 0ms 0ms nim 2.2.2
nim 1.nim 1.2ms 0.0ms 1.9MB 0ms 0ms nim/clang 2.2.2
csharp 1.cs 7.6ms 2.7ms 9.6MB 0ms 0ms dotnet/aot 9.0.202
csharp 1.cs 32ms 0.6ms 21.3MB 20ms 0ms mono 6.12.0
csharp 1.cs 45ms 3.1ms 26.3MB 22ms 8ms dotnet 9.0.202

lru

Input: 1000 1000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 2.cs 95ms 1.1ms 9.8MB 83ms 0ms dotnet/aot 9.0.202
nim 2.nim 111ms 1.6ms 1.6MB 100ms 0ms nim/clang 2.2.2
nim 2.nim 113ms 2.6ms 1.4MB 103ms 0ms nim 2.2.2
csharp 2.cs 149ms 1.5ms 23.2MB 140ms 0ms mono 6.12.0
csharp 2.cs 251ms 4.0ms 29.6MB 233ms 10ms dotnet 9.0.202
csharp 1.cs 1037ms 4.4ms 13.3MB 1023ms 7ms dotnet/aot 9.0.202
csharp 1.cs 1284ms 17ms 32.9MB 1280ms 3ms dotnet 9.0.202
csharp 1.cs 3333ms 39ms 49.6MB 3290ms 30ms mono 6.12.0
nim 1.nim timeout 0.0ms 1.3MB 4990ms 0ms nim 2.2.2
nim 1.nim timeout 0.0ms 1.5MB 4990ms 0ms nim/clang 2.2.2

Input: 1000 3000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 2.cs 273ms 1.7ms 9.9MB 260ms 0ms dotnet/aot 9.0.202
nim 2.nim 324ms 1.9ms 1.6MB 313ms 0ms nim/clang 2.2.2
nim 2.nim 326ms 1.9ms 1.6MB 320ms 0ms nim 2.2.2
csharp 2.cs 360ms 3.5ms 22.8MB 343ms 0ms mono 6.12.0
csharp 2.cs 403ms 4.6ms 29.3MB 383ms 7ms dotnet 9.0.202
csharp 1.cs 3112ms 26ms 13.3MB 3087ms 10ms dotnet/aot 9.0.202
csharp 1.cs 3600ms 76ms 32.9MB 3573ms 20ms dotnet 9.0.202
csharp 1.cs timeout 0.0ms 45.8MB 4947ms 43ms mono 6.12.0
nim 1.nim timeout 0.0ms 1.3MB 4990ms 0ms nim 2.2.2
nim 1.nim timeout 0.0ms 1.5MB 4990ms 0ms nim/clang 2.2.2

Input: 100 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 50ms 1.1ms 1.3MB 40ms 0ms nim 2.2.2
nim 2.nim 50ms 0.7ms 1.6MB 40ms 0ms nim/clang 2.2.2
csharp 2.cs 53ms 0.6ms 9.6MB 40ms 0ms dotnet/aot 9.0.202
csharp 2.cs 93ms 2.5ms 22.7MB 80ms 0ms mono 6.12.0
csharp 2.cs 171ms 0.3ms 29.1MB 143ms 7ms dotnet 9.0.202
nim 1.nim 440ms 2.2ms 1.5MB 430ms 0ms nim/clang 2.2.2
nim 1.nim 481ms 0.8ms 1.3MB 470ms 0ms nim 2.2.2
csharp 1.cs 1619ms 3.8ms 32.5MB 1610ms 10ms dotnet 9.0.202
csharp 1.cs 1803ms 2.1ms 12.9MB 1790ms 0ms dotnet/aot 9.0.202
csharp 1.cs 1821ms 8.6ms 28.8MB 1803ms 0ms mono 6.12.0

mandelbrot

Input: 5000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 4.cs 345ms 4.7ms 37.5MB 320ms 13ms dotnet 9.0.202
nim 1.nim 388ms 0.9ms 4.7MB 380ms 0ms nim/clang 2.2.2
nim 1.nim 579ms 3.4ms 4.4MB 570ms 0ms nim 2.2.2
csharp 2.cs 597ms 87ms 39.7MB 573ms 13ms dotnet 9.0.202
csharp 1.cs 2046ms 14ms 36.4MB 2023ms 10ms dotnet 9.0.202
csharp 3.cs 2352ms 15ms 16.4MB 2337ms 0ms dotnet/aot 9.0.202
csharp 3.cs 2448ms 6.9ms 36.5MB 2420ms 13ms dotnet 9.0.202
csharp 1.cs 4021ms 43ms 16.4MB 4007ms 0ms dotnet/aot 9.0.202
csharp 1.cs timeout 0.0ms 23.1MB 4990ms 0ms mono 6.12.0

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 19ms 0.3ms 1.9MB 10ms 0ms nim/clang 2.2.2
nim 1.nim 26ms 0.4ms 1.6MB 20ms 0ms nim 2.2.2
csharp 4.cs 89ms 9.3ms 34.6MB 67ms 10ms dotnet 9.0.202
csharp 3.cs 105ms 2.2ms 13.6MB 90ms 0ms dotnet/aot 9.0.202
csharp 2.cs 115ms 5.5ms 36.5MB 90ms 10ms dotnet 9.0.202
csharp 1.cs 136ms 2.8ms 33.6MB 120ms 7ms dotnet 9.0.202
csharp 3.cs 163ms 1.1ms 34.0MB 140ms 10ms dotnet 9.0.202
csharp 1.cs 172ms 3.0ms 13.5MB 160ms 0ms dotnet/aot 9.0.202
csharp 1.cs 574ms 6.1ms 23.8MB 560ms 0ms mono 6.12.0

merkletrees

Input: 17

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 534ms 2.9ms 34.6MB 517ms 0ms nim 2.2.2
csharp 2.cs 552ms 23ms 120.8MB 497ms 93ms dotnet/aot 9.0.202
csharp 1.cs 621ms 12ms 154.1MB 560ms 130ms dotnet/aot 9.0.202
nim 1.nim 631ms 20ms 34.9MB 613ms 3ms nim/clang 2.2.2
csharp 2.cs 668ms 39ms 137.8MB 610ms 100ms dotnet 9.0.202
csharp 1.cs 725ms 42ms 168.6MB 643ms 143ms dotnet 9.0.202
csharp 1.cs 1248ms 3.8ms 142.4MB 1437ms 147ms mono 6.12.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 114ms 2.7ms 9.6MB 100ms 0ms nim 2.2.2
csharp 2.cs 135ms 4.1ms 58.8MB 110ms 30ms dotnet/aot 9.0.202
nim 1.nim 135ms 3.0ms 9.9MB 123ms 0ms nim/clang 2.2.2
csharp 1.cs 152ms 3.0ms 72.5MB 117ms 50ms dotnet/aot 9.0.202
csharp 2.cs 257ms 7.3ms 72.8MB 220ms 40ms dotnet 9.0.202
csharp 1.cs 258ms 6.4ms 67.4MB 230ms 33ms mono 6.12.0
csharp 1.cs 315ms 37ms 91.1MB 237ms 63ms dotnet 9.0.202

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 319ms 1.2ms 1.8MB 310ms 0ms nim 2.2.2
nim 2.nim 342ms 0.5ms 2.0MB 330ms 0ms nim/clang 2.2.2
csharp 9.cs 358ms 2.8ms 27.6MB 340ms 10ms dotnet 9.0.202
csharp 8.cs 376ms 6.6ms 9.8MB 363ms 0ms dotnet/aot 9.0.202
csharp 8.cs 419ms 3.2ms 27.5MB 400ms 7ms dotnet 9.0.202
csharp 8.cs 1245ms 4.0ms 22.1MB 1227ms 0ms mono 6.12.0

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 34ms 0.6ms 1.8MB 27ms 0ms nim 2.2.2
nim 2.nim 37ms 1.4ms 2.0MB 30ms 0ms nim/clang 2.2.2
csharp 8.cs 45ms 1.0ms 9.9MB 30ms 0ms dotnet/aot 9.0.202
csharp 9.cs 93ms 3.1ms 27.9MB 73ms 7ms dotnet 9.0.202
csharp 8.cs 93ms 2.6ms 27.5MB 73ms 7ms dotnet 9.0.202
csharp 8.cs 161ms 1.5ms 22.8MB 150ms 0ms mono 6.12.0

nsieve

Input: 12

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 271ms 8.1ms 41.5MB 257ms 0ms nim 2.2.2
csharp 1.cs 292ms 3.4ms 78.8MB 270ms 10ms dotnet/aot 9.0.202
nim 1.nim 298ms 2.6ms 41.8MB 287ms 0ms nim/clang 2.2.2
csharp 1.cs 323ms 2.9ms 96.2MB 300ms 13ms dotnet 9.0.202
csharp 2.cs 392ms 2.6ms 35.6MB 370ms 10ms dotnet 9.0.202
csharp 2.cs 423ms 4.5ms 17.6MB 410ms 0ms dotnet/aot 9.0.202
csharp 1.cs 533ms 6.3ms 84.0MB 513ms 7ms mono 6.12.0
csharp 2.cs 1870ms 2.9ms 29.8MB 1853ms 0ms mono 6.12.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 51ms 0.5ms 11.5MB 40ms 0ms nim 2.2.2
nim 1.nim 57ms 0.8ms 11.8MB 50ms 0ms nim/clang 2.2.2
csharp 1.cs 64ms 1.5ms 25.1MB 50ms 3ms dotnet/aot 9.0.202
csharp 1.cs 100ms 4.1ms 42.5MB 80ms 10ms dotnet 9.0.202
csharp 2.cs 106ms 0.6ms 12.0MB 97ms 0ms dotnet/aot 9.0.202
csharp 2.cs 127ms 5.4ms 30.0MB 103ms 10ms dotnet 9.0.202
csharp 1.cs 144ms 2.3ms 38.3MB 130ms 0ms mono 6.12.0
csharp 2.cs 484ms 8.9ms 21.1MB 470ms 0ms mono 6.12.0

regex-redux

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 1633ms 8.8ms 164.1MB 1603ms 13ms nim/clang 2.2.2
nim 1.nim 1703ms 20ms 163.9MB 1670ms 20ms nim 2.2.2
csharp 6.cs 1735ms 17ms 418.8MB 1640ms 140ms dotnet/aot 9.0.202
csharp 5.cs 2063ms 12ms 443.8MB 2100ms 187ms dotnet 9.0.202
csharp 6.cs 2755ms 94ms 440.5MB 2703ms 170ms dotnet 9.0.202
csharp 5.cs 4239ms 13ms 419.4MB 4147ms 140ms dotnet/aot 9.0.202

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 173ms 2.3ms 20.9MB 160ms 0ms nim/clang 2.2.2
nim 1.nim 178ms 2.0ms 20.6MB 163ms 0ms nim 2.2.2
csharp 6.cs 190ms 1.1ms 47.4MB 167ms 13ms dotnet/aot 9.0.202
csharp 5.cs 281ms 4.5ms 71.2MB 247ms 33ms dotnet 9.0.202
csharp 6.cs 387ms 1.6ms 70.7MB 357ms 27ms dotnet 9.0.202
csharp 5.cs 441ms 1.0ms 47.7MB 420ms 13ms dotnet/aot 9.0.202

spectral-norm

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 3-m.cs 1841ms 7.6ms 10.5MB 7173ms 10ms dotnet/aot 9.0.202
csharp 3-m.cs 1930ms 5.0ms 30.1MB 7370ms 13ms dotnet 9.0.202
nim 1.nim 3590ms 1.4ms 1.6MB 3580ms 0ms nim/clang 2.2.2
nim 1.nim 3596ms 7.0ms 1.9MB 3583ms 0ms nim 2.2.2
csharp 3-m.cs 4705ms 144ms 25.6MB 17887ms 20ms mono 6.12.0

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 3-m.cs 492ms 25ms 10.5MB 1780ms 7ms dotnet/aot 9.0.202
csharp 3-m.cs 652ms 40ms 29.8MB 1707ms 13ms dotnet 9.0.202
nim 1.nim 899ms 0.8ms 1.5MB 890ms 0ms nim/clang 2.2.2
nim 1.nim 901ms 1.6ms 1.3MB 890ms 0ms nim 2.2.2
csharp 3-m.cs 1237ms 39ms 27.5MB 4640ms 13ms mono 6.12.0

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 3-m.cs 126ms 1.2ms 10.4MB 443ms 0ms dotnet/aot 9.0.202
nim 1.nim 227ms 0.3ms 1.5MB 220ms 0ms nim/clang 2.2.2
nim 1.nim 229ms 1.2ms 1.3MB 220ms 0ms nim 2.2.2
csharp 3-m.cs 251ms 4.1ms 28.6MB 460ms 13ms dotnet 9.0.202
csharp 3-m.cs 348ms 0.4ms 25.2MB 1173ms 13ms mono 6.12.0