Programming Language and compiler
Benchmarks

Nim VS C# 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
nim 2.nim 775ms 6.2ms 33.9MB 757ms 10ms nim 2.2.4
csharp 1.cs 943ms 22ms 185.3MB 937ms 150ms dotnet 9.0.203
nim 2.nim 953ms 12ms 35.2MB 933ms 7ms nim/clang 2.2.4
csharp 1.cs 955ms 17ms 188.9MB 957ms 143ms dotnet/aot 9.0.203
csharp 1.cs 1699ms 20ms 101.5MB 1897ms 217ms mono 6.12.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 76ms 2.3ms 5.5MB 67ms 0ms nim 2.2.4
nim 2.nim 92ms 3.6ms 5.8MB 83ms 0ms nim/clang 2.2.4
csharp 1.cs 123ms 5.1ms 31.9MB 87ms 33ms dotnet/aot 9.0.203
csharp 1.cs 140ms 0.7ms 44.1MB 117ms 13ms mono 6.12.0
csharp 1.cs 206ms 6.4ms 50.4MB 157ms 37ms dotnet 9.0.203

coro-prime-sieve

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 1-m.cs 2151ms 190ms 51.9MB 7533ms 73ms dotnet/aot 9.0.203
csharp 1-m.cs 2664ms 219ms 74.3MB 8140ms 107ms dotnet 9.0.203
nim 1.nim timeout 0.0ms 554.2MB 2543ms 1993ms nim 2.2.4
nim 1.nim timeout 0.0ms 552.6MB 2487ms 2053ms nim/clang 2.2.4

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 1-m.cs 167ms 15ms 19.5MB 487ms 10ms dotnet/aot 9.0.203
csharp 1-m.cs 275ms 8.4ms 36.8MB 787ms 20ms dotnet 9.0.203
nim 1.nim 4338ms 12ms 519.4MB 2163ms 1750ms nim 2.2.4
nim 1.nim 4380ms 6.7ms 518.6MB 2120ms 1837ms nim/clang 2.2.4

fasta

Input: 2500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 5-m.cs 114ms 1.5ms 22.1MB 350ms 57ms dotnet/aot 9.0.203
nim 2.nim 187ms 0.8ms 1.5MB 180ms 0ms nim 2.2.4
csharp 5-m.cs 190ms 2.0ms 38.3MB 467ms 123ms dotnet 9.0.203
csharp 5-m.cs 241ms 15ms 51.6MB 663ms 123ms mono 6.12.0
nim 2.nim 243ms 2.3ms 1.8MB 233ms 0ms nim/clang 2.2.4
nim 1.nim 550ms 1.7ms 1.8MB 440ms 100ms nim/clang 2.2.4
nim 1.nim 574ms 3.5ms 1.5MB 467ms 97ms nim 2.2.4

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 20ms 0.1ms 1.5MB 10ms 0ms nim 2.2.4
csharp 5-m.cs 24ms 1.2ms 15.6MB 33ms 13ms dotnet/aot 9.0.203
nim 2.nim 26ms 0.7ms 1.8MB 20ms 0ms nim/clang 2.2.4
nim 1.nim 58ms 0.4ms 1.8MB 40ms 3ms nim/clang 2.2.4
nim 1.nim 60ms 0.9ms 1.5MB 43ms 0ms nim 2.2.4
csharp 5-m.cs 65ms 3.9ms 37.4MB 87ms 17ms dotnet 9.0.203
csharp 5-m.cs 71ms 1.9ms 30.8MB 100ms 27ms mono 6.12.0

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 1.0ms 0.0ms 1.5MB 0ms 0ms nim 2.2.4
nim 1.nim 1.1ms 0.0ms 1.9MB 0ms 0ms nim/clang 2.2.4
csharp 1.cs 10ms 5.6ms 7.6MB 0ms 0ms dotnet/aot 9.0.203
csharp 1.cs 31ms 1.0ms 21.4MB 20ms 0ms mono 6.12.0
csharp 1.cs 34ms 0.4ms 26.0MB 20ms 2ms dotnet 9.0.203

lru

Input: 1000 1000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 2.cs 94ms 1.7ms 9.8MB 80ms 0ms dotnet/aot 9.0.203
nim 2.nim 112ms 3.7ms 1.6MB 103ms 0ms nim/clang 2.2.4
nim 2.nim 113ms 0.4ms 1.4MB 103ms 0ms nim 2.2.4
csharp 2.cs 151ms 1.0ms 23.2MB 133ms 0ms mono 6.12.0
csharp 2.cs 256ms 3.5ms 29.5MB 240ms 7ms dotnet 9.0.203
csharp 1.cs 1044ms 8.4ms 13.0MB 1027ms 3ms dotnet/aot 9.0.203
csharp 1.cs 1298ms 21ms 33.0MB 1283ms 13ms dotnet 9.0.203
csharp 1.cs 3310ms 13ms 45.4MB 3267ms 33ms mono 6.12.0
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
csharp 2.cs 260ms 1.6ms 9.8MB 250ms 0ms dotnet/aot 9.0.203
nim 2.nim 325ms 2.2ms 1.6MB 320ms 0ms nim/clang 2.2.4
nim 2.nim 337ms 3.0ms 1.4MB 327ms 0ms nim 2.2.4
csharp 2.cs 361ms 6.0ms 23.0MB 343ms 0ms mono 6.12.0
csharp 2.cs 404ms 3.1ms 29.4MB 390ms 7ms dotnet 9.0.203
csharp 1.cs 3097ms 9.3ms 13.1MB 3073ms 13ms dotnet/aot 9.0.203
csharp 1.cs 3653ms 102ms 32.4MB 3643ms 17ms dotnet 9.0.203
csharp 1.cs timeout 0.0ms 43.6MB 4940ms 50ms mono 6.12.0
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 49ms 0.5ms 1.5MB 40ms 0ms nim/clang 2.2.4
csharp 2.cs 50ms 1.8ms 9.6MB 40ms 0ms dotnet/aot 9.0.203
nim 2.nim 51ms 0.7ms 1.3MB 40ms 0ms nim 2.2.4
csharp 2.cs 94ms 2.7ms 22.8MB 80ms 0ms mono 6.12.0
csharp 2.cs 168ms 1.0ms 29.3MB 150ms 3ms dotnet 9.0.203
nim 1.nim 488ms 11ms 1.5MB 480ms 0ms nim/clang 2.2.4
nim 1.nim 493ms 16ms 1.3MB 483ms 0ms nim 2.2.4
csharp 1.cs 1616ms 2.4ms 32.8MB 1610ms 13ms dotnet 9.0.203
csharp 1.cs 1820ms 6.9ms 28.8MB 1803ms 0ms mono 6.12.0
csharp 1.cs 1826ms 2.7ms 12.9MB 1813ms 0ms dotnet/aot 9.0.203

mandelbrot

Input: 5000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 4.cs 331ms 1.8ms 37.2MB 310ms 10ms dotnet 9.0.203
nim 1.nim 387ms 1.0ms 4.8MB 380ms 0ms nim/clang 2.2.4
csharp 2.cs 550ms 85ms 39.6MB 527ms 13ms dotnet 9.0.203
nim 1.nim 579ms 4.0ms 4.5MB 570ms 0ms nim 2.2.4
csharp 1.cs 2035ms 6.8ms 36.6MB 2010ms 10ms dotnet 9.0.203
csharp 3.cs 2456ms 6.5ms 36.5MB 2430ms 10ms dotnet 9.0.203
csharp 3.cs 2525ms 0.7ms 16.3MB 2510ms 0ms dotnet/aot 9.0.203
csharp 1.cs 3562ms 4.9ms 16.3MB 3547ms 0ms dotnet/aot 9.0.203
csharp 1.cs timeout 0.0ms 22.2MB 4987ms 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 0.5ms 1.9MB 10ms 0ms nim/clang 2.2.4
nim 1.nim 26ms 0.6ms 1.6MB 20ms 0ms nim 2.2.4
csharp 4.cs 81ms 8.6ms 34.3MB 53ms 10ms dotnet 9.0.203
csharp 3.cs 116ms 1.9ms 13.0MB 103ms 0ms dotnet/aot 9.0.203
csharp 1.cs 135ms 0.8ms 33.9MB 113ms 10ms dotnet 9.0.203
csharp 2.cs 150ms 60ms 36.8MB 127ms 10ms dotnet 9.0.203
csharp 1.cs 156ms 1.3ms 13.0MB 140ms 0ms dotnet/aot 9.0.203
csharp 3.cs 166ms 5.6ms 33.8MB 143ms 7ms dotnet 9.0.203
csharp 1.cs 575ms 10ms 23.5MB 560ms 0ms mono 6.12.0

merkletrees

Input: 17

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 2.cs 542ms 21ms 121.4MB 490ms 90ms dotnet/aot 9.0.203
nim 1.nim 545ms 3.9ms 34.9MB 523ms 7ms nim 2.2.4
csharp 1.cs 603ms 8.7ms 143.3MB 557ms 117ms dotnet/aot 9.0.203
nim 1.nim 627ms 17ms 35.2MB 610ms 3ms nim/clang 2.2.4
csharp 2.cs 678ms 16ms 136.3MB 627ms 100ms dotnet 9.0.203
csharp 1.cs 761ms 17ms 164.3MB 697ms 130ms dotnet 9.0.203
csharp 1.cs 1306ms 19ms 140.5MB 1507ms 173ms mono 6.12.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 117ms 2.0ms 9.6MB 107ms 0ms nim 2.2.4
nim 1.nim 133ms 1.1ms 9.9MB 120ms 0ms nim/clang 2.2.4
csharp 2.cs 135ms 2.4ms 57.2MB 110ms 30ms dotnet/aot 9.0.203
csharp 1.cs 157ms 2.1ms 74.5MB 120ms 53ms dotnet/aot 9.0.203
csharp 2.cs 258ms 7.0ms 74.8MB 223ms 40ms dotnet 9.0.203
csharp 1.cs 258ms 0.7ms 69.4MB 233ms 30ms mono 6.12.0
csharp 1.cs 281ms 5.4ms 89.5MB 237ms 57ms dotnet 9.0.203

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 320ms 1.7ms 1.8MB 310ms 0ms nim 2.2.4
nim 2.nim 344ms 1.7ms 2.0MB 337ms 0ms nim/clang 2.2.4
csharp 9.cs 358ms 2.8ms 28.0MB 340ms 7ms dotnet 9.0.203
csharp 8.cs 370ms 3.1ms 9.9MB 360ms 0ms dotnet/aot 9.0.203
csharp 8.cs 423ms 3.6ms 27.5MB 400ms 7ms dotnet 9.0.203
csharp 8.cs 1250ms 5.1ms 20.4MB 1237ms 0ms mono 6.12.0

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 35ms 0.5ms 1.8MB 30ms 0ms nim 2.2.4
nim 2.nim 37ms 0.5ms 2.0MB 30ms 0ms nim/clang 2.2.4
csharp 8.cs 46ms 1.1ms 9.9MB 37ms 0ms dotnet/aot 9.0.203
csharp 9.cs 90ms 1.4ms 27.6MB 73ms 3ms dotnet 9.0.203
csharp 8.cs 94ms 1.2ms 27.5MB 80ms 3ms dotnet 9.0.203
csharp 8.cs 164ms 3.9ms 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 269ms 7.3ms 41.5MB 260ms 0ms nim 2.2.4
csharp 1.cs 310ms 3.9ms 78.9MB 290ms 10ms dotnet/aot 9.0.203
nim 1.nim 318ms 3.3ms 41.8MB 307ms 0ms nim/clang 2.2.4
csharp 1.cs 355ms 2.4ms 96.3MB 330ms 13ms dotnet 9.0.203
csharp 2.cs 393ms 1.8ms 17.4MB 377ms 0ms dotnet/aot 9.0.203
csharp 2.cs 397ms 1.9ms 35.6MB 380ms 7ms dotnet 9.0.203
csharp 1.cs 550ms 8.4ms 84.0MB 527ms 10ms mono 6.12.0
csharp 2.cs 1862ms 2.9ms 27.5MB 1847ms 0ms mono 6.12.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 54ms 4.3ms 11.5MB 47ms 0ms nim 2.2.4
csharp 1.cs 64ms 3.2ms 24.8MB 50ms 7ms dotnet/aot 9.0.203
nim 1.nim 65ms 1.4ms 11.8MB 57ms 0ms nim/clang 2.2.4
csharp 1.cs 100ms 1.2ms 42.3MB 80ms 7ms dotnet 9.0.203
csharp 2.cs 101ms 1.3ms 11.9MB 90ms 0ms dotnet/aot 9.0.203
csharp 2.cs 127ms 1.0ms 30.1MB 103ms 10ms dotnet 9.0.203
csharp 1.cs 146ms 1.7ms 38.2MB 130ms 7ms mono 6.12.0
csharp 2.cs 483ms 5.4ms 23.0MB 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 1644ms 4.7ms 152.4MB 1610ms 20ms nim/clang 2.2.4
nim 1.nim 1672ms 7.2ms 152.1MB 1640ms 20ms nim 2.2.4
csharp 6.cs 1761ms 4.6ms 416.8MB 1653ms 160ms dotnet/aot 9.0.203
csharp 5.cs 2090ms 65ms 445.0MB 2137ms 177ms dotnet 9.0.203
csharp 6.cs 2767ms 68ms 439.8MB 2703ms 187ms dotnet 9.0.203
csharp 5.cs 4291ms 32ms 418.5MB 4193ms 153ms dotnet/aot 9.0.203

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 173ms 1.3ms 17.6MB 160ms 0ms nim/clang 2.2.4
nim 1.nim 177ms 3.1ms 17.4MB 163ms 0ms nim 2.2.4
csharp 6.cs 191ms 2.6ms 47.8MB 167ms 17ms dotnet/aot 9.0.203
csharp 5.cs 281ms 1.6ms 72.4MB 253ms 30ms dotnet 9.0.203
csharp 6.cs 389ms 1.5ms 70.3MB 363ms 27ms dotnet 9.0.203
csharp 5.cs 443ms 4.6ms 46.8MB 417ms 13ms dotnet/aot 9.0.203

spectral-norm

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 3-m.cs 1857ms 0.8ms 10.5MB 7263ms 10ms dotnet/aot 9.0.203
csharp 3-m.cs 1927ms 7.1ms 30.0MB 7350ms 17ms dotnet 9.0.203
nim 1.nim 3589ms 1.3ms 1.6MB 3580ms 0ms nim/clang 2.2.4
nim 1.nim 3603ms 8.0ms 1.4MB 3597ms 0ms nim 2.2.4
csharp 3-m.cs 4664ms 7.4ms 25.5MB 18030ms 17ms mono 6.12.0

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 3-m.cs 473ms 1.1ms 10.4MB 1810ms 0ms dotnet/aot 9.0.203
csharp 3-m.cs 536ms 6.8ms 29.8MB 1880ms 10ms dotnet 9.0.203
nim 1.nim 899ms 0.2ms 1.5MB 890ms 0ms nim/clang 2.2.4
nim 1.nim 904ms 4.4ms 1.3MB 893ms 0ms nim 2.2.4
csharp 3-m.cs 1213ms 6.5ms 25.6MB 4547ms 10ms mono 6.12.0

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 3-m.cs 127ms 1.6ms 10.5MB 450ms 0ms dotnet/aot 9.0.203
csharp 3-m.cs 181ms 4.2ms 28.5MB 503ms 10ms dotnet 9.0.203
nim 1.nim 227ms 0.6ms 1.5MB 220ms 0ms nim/clang 2.2.4
nim 1.nim 228ms 1.2ms 1.3MB 220ms 0ms nim 2.2.4
csharp 3-m.cs 353ms 13ms 25.5MB 1193ms 10ms mono 6.12.0