Programming Language and compiler
Benchmarks

Nim VS C# benchmarks

Current benchmark data was generated on Mon May 19 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 836ms 40ms 34.9MB 817ms 7ms nim 2.2.4
csharp 1.cs 937ms 10ms 185.4MB 937ms 137ms dotnet 9.0.300
nim 2.nim 971ms 5.9ms 35.2MB 953ms 3ms nim/clang 2.2.4
csharp 1.cs 1089ms 203ms 175.6MB 1003ms 140ms dotnet/aot 9.0.300
csharp 1.cs 1663ms 38ms 98.4MB 1863ms 183ms mono 6.12.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 77ms 1.2ms 5.5MB 70ms 0ms nim 2.2.4
nim 2.nim 93ms 2.7ms 5.8MB 80ms 0ms nim/clang 2.2.4
csharp 1.cs 142ms 2.5ms 44.0MB 123ms 10ms mono 6.12.0
csharp 1.cs 161ms 19ms 31.8MB 100ms 30ms dotnet/aot 9.0.300
csharp 1.cs 203ms 9.4ms 50.0MB 160ms 37ms dotnet 9.0.300

coro-prime-sieve

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 1-m.cs 2148ms 121ms 48.9MB 7577ms 67ms dotnet/aot 9.0.300
csharp 1-m.cs 2876ms 225ms 73.0MB 9937ms 117ms dotnet 9.0.300
nim 1.nim timeout 0.0ms 575.4MB 2623ms 1900ms nim 2.2.4
nim 1.nim timeout 0.0ms 575.7MB 2560ms 1967ms 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 149ms 3.9ms 20.9MB 447ms 10ms dotnet/aot 9.0.300
csharp 1-m.cs 298ms 11ms 37.4MB 860ms 23ms dotnet 9.0.300
nim 1.nim 4094ms 5.6ms 519.3MB 2117ms 1553ms nim 2.2.4
nim 1.nim 4109ms 27ms 518.7MB 2100ms 1580ms 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 130ms 1.4ms 25.4MB 353ms 97ms dotnet/aot 9.0.300
nim 2.nim 188ms 2.8ms 1.5MB 180ms 0ms nim 2.2.4
csharp 5-m.cs 190ms 8.2ms 39.0MB 473ms 110ms dotnet 9.0.300
csharp 5-m.cs 239ms 13ms 49.4MB 680ms 103ms mono 6.12.0
nim 2.nim 243ms 2.1ms 1.8MB 230ms 0ms nim/clang 2.2.4
nim 1.nim 533ms 0.9ms 1.8MB 453ms 67ms nim/clang 2.2.4
nim 1.nim 557ms 2.9ms 1.5MB 470ms 73ms nim 2.2.4

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 22ms 0.7ms 1.5MB 10ms 0ms nim 2.2.4
csharp 5-m.cs 25ms 1.5ms 16.1MB 33ms 17ms dotnet/aot 9.0.300
nim 2.nim 27ms 1.0ms 1.8MB 20ms 0ms nim/clang 2.2.4
nim 1.nim 56ms 0.8ms 1.8MB 43ms 0ms nim/clang 2.2.4
nim 1.nim 59ms 1.8ms 1.5MB 40ms 3ms nim 2.2.4
csharp 5-m.cs 62ms 2.0ms 37.3MB 87ms 17ms dotnet 9.0.300
csharp 5-m.cs 73ms 0.4ms 31.2MB 103ms 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 1.6MB 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 7.5ms 2.9ms 9.6MB 0ms 0ms dotnet/aot 9.0.300
csharp 1.cs 32ms 1.0ms 23.9MB 20ms 2ms mono 6.12.0
csharp 1.cs 35ms 0.3ms 26.1MB 20ms 0ms dotnet 9.0.300

lru

Input: 1000 1000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 2.cs 93ms 0.6ms 9.6MB 80ms 0ms dotnet/aot 9.0.300
nim 2.nim 110ms 1.5ms 1.6MB 100ms 0ms nim/clang 2.2.4
nim 2.nim 114ms 1.4ms 1.4MB 107ms 0ms nim 2.2.4
csharp 2.cs 148ms 2.9ms 21.2MB 137ms 3ms mono 6.12.0
csharp 2.cs 255ms 4.3ms 29.5MB 233ms 10ms dotnet 9.0.300
csharp 1.cs 1040ms 5.1ms 13.3MB 1020ms 10ms dotnet/aot 9.0.300
csharp 1.cs 1302ms 18ms 33.1MB 1287ms 20ms dotnet 9.0.300
csharp 1.cs 3346ms 4.8ms 45.5MB 3297ms 40ms 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 263ms 3.9ms 9.8MB 247ms 0ms dotnet/aot 9.0.300
nim 2.nim 325ms 2.6ms 1.6MB 317ms 0ms nim/clang 2.2.4
nim 2.nim 336ms 4.1ms 1.4MB 327ms 0ms nim 2.2.4
csharp 2.cs 378ms 23ms 22.6MB 360ms 0ms mono 6.12.0
csharp 2.cs 403ms 7.6ms 29.1MB 383ms 10ms dotnet 9.0.300
csharp 1.cs 3118ms 26ms 13.3MB 3090ms 13ms dotnet/aot 9.0.300
csharp 1.cs 3650ms 14ms 32.8MB 3633ms 17ms dotnet 9.0.300
csharp 1.cs timeout 0.0ms 45.6MB 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 50ms 1.8ms 1.5MB 40ms 0ms nim/clang 2.2.4
csharp 2.cs 51ms 1.0ms 9.6MB 40ms 0ms dotnet/aot 9.0.300
nim 2.nim 52ms 1.0ms 1.3MB 43ms 0ms nim 2.2.4
csharp 2.cs 94ms 1.8ms 20.8MB 80ms 0ms mono 6.12.0
csharp 2.cs 166ms 3.5ms 29.5MB 150ms 3ms dotnet 9.0.300
nim 1.nim 482ms 4.8ms 1.3MB 477ms 0ms nim 2.2.4
nim 1.nim 488ms 14ms 1.5MB 477ms 0ms nim/clang 2.2.4
csharp 1.cs 1616ms 3.8ms 32.5MB 1607ms 10ms dotnet 9.0.300
csharp 1.cs 1820ms 10ms 28.8MB 1803ms 0ms mono 6.12.0
csharp 1.cs 1824ms 6.5ms 13.0MB 1807ms 0ms dotnet/aot 9.0.300

mandelbrot

Input: 5000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 387ms 0.4ms 4.8MB 380ms 0ms nim/clang 2.2.4
csharp 4.cs 393ms 90ms 37.2MB 370ms 10ms dotnet 9.0.300
csharp 2.cs 542ms 30ms 39.8MB 513ms 17ms dotnet 9.0.300
nim 1.nim 576ms 1.5ms 4.5MB 563ms 0ms nim 2.2.4
csharp 1.cs 2032ms 8.7ms 36.5MB 2003ms 10ms dotnet 9.0.300
csharp 3.cs 2353ms 7.5ms 16.5MB 2340ms 0ms dotnet/aot 9.0.300
csharp 3.cs 2458ms 7.7ms 36.8MB 2430ms 13ms dotnet 9.0.300
csharp 1.cs 3952ms 112ms 16.2MB 3937ms 0ms dotnet/aot 9.0.300
csharp 1.cs timeout 0.0ms 24.1MB 4983ms 3ms 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 27ms 1.2ms 1.6MB 20ms 0ms nim 2.2.4
csharp 4.cs 80ms 2.2ms 34.4MB 57ms 10ms dotnet 9.0.300
csharp 3.cs 110ms 2.9ms 13.5MB 100ms 0ms dotnet/aot 9.0.300
csharp 2.cs 111ms 4.3ms 36.8MB 87ms 13ms dotnet 9.0.300
csharp 1.cs 138ms 2.6ms 33.5MB 117ms 10ms dotnet 9.0.300
csharp 3.cs 175ms 5.6ms 33.8MB 150ms 10ms dotnet 9.0.300
csharp 1.cs 175ms 5.9ms 13.5MB 163ms 0ms dotnet/aot 9.0.300
csharp 1.cs 574ms 7.0ms 23.7MB 557ms 3ms mono 6.12.0

merkletrees

Input: 17

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 2.cs 537ms 11ms 121.0MB 490ms 90ms dotnet/aot 9.0.300
nim 1.nim 552ms 1.9ms 34.9MB 530ms 7ms nim 2.2.4
csharp 1.cs 614ms 11ms 143.3MB 563ms 120ms dotnet/aot 9.0.300
nim 1.nim 634ms 34ms 35.2MB 613ms 10ms nim/clang 2.2.4
csharp 2.cs 684ms 6.9ms 136.2MB 630ms 97ms dotnet 9.0.300
csharp 1.cs 764ms 21ms 161.6MB 710ms 117ms dotnet 9.0.300
csharp 1.cs 1297ms 5.6ms 140.0MB 1507ms 167ms mono 6.12.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 120ms 2.4ms 9.6MB 110ms 0ms nim 2.2.4
nim 1.nim 135ms 2.2ms 9.9MB 123ms 0ms nim/clang 2.2.4
csharp 2.cs 137ms 9.3ms 57.3MB 110ms 30ms dotnet/aot 9.0.300
csharp 1.cs 158ms 4.3ms 74.7MB 120ms 50ms dotnet/aot 9.0.300
csharp 2.cs 262ms 6.1ms 75.2MB 227ms 37ms dotnet 9.0.300
csharp 1.cs 266ms 1.9ms 69.4MB 240ms 37ms mono 6.12.0
csharp 1.cs 272ms 2.6ms 88.1MB 243ms 53ms dotnet 9.0.300

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 319ms 1.7ms 1.8MB 310ms 0ms nim 2.2.4
nim 2.nim 340ms 0.5ms 2.0MB 330ms 0ms nim/clang 2.2.4
csharp 9.cs 363ms 3.7ms 27.6MB 340ms 7ms dotnet 9.0.300
csharp 8.cs 372ms 0.9ms 9.8MB 360ms 0ms dotnet/aot 9.0.300
csharp 8.cs 423ms 2.3ms 27.6MB 403ms 3ms dotnet 9.0.300
csharp 8.cs 1252ms 5.3ms 22.4MB 1240ms 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 1.0ms 1.8MB 30ms 0ms nim 2.2.4
nim 2.nim 40ms 6.2ms 2.0MB 33ms 0ms nim/clang 2.2.4
csharp 8.cs 46ms 0.5ms 9.8MB 30ms 0ms dotnet/aot 9.0.300
csharp 9.cs 93ms 1.5ms 27.8MB 73ms 10ms dotnet 9.0.300
csharp 8.cs 95ms 2.7ms 27.6MB 77ms 7ms dotnet 9.0.300
csharp 8.cs 162ms 0.3ms 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 267ms 0.8ms 41.5MB 253ms 0ms nim 2.2.4
nim 1.nim 314ms 3.5ms 41.8MB 303ms 0ms nim/clang 2.2.4
csharp 1.cs 325ms 6.5ms 78.7MB 307ms 3ms dotnet/aot 9.0.300
csharp 1.cs 361ms 8.4ms 96.1MB 333ms 13ms dotnet 9.0.300
csharp 2.cs 394ms 2.3ms 17.5MB 377ms 0ms dotnet/aot 9.0.300
csharp 2.cs 399ms 6.4ms 35.4MB 380ms 7ms dotnet 9.0.300
csharp 1.cs 560ms 6.0ms 82.0MB 540ms 10ms mono 6.12.0
csharp 2.cs 1908ms 73ms 29.5MB 1887ms 3ms mono 6.12.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 51ms 1.1ms 11.6MB 40ms 0ms nim 2.2.4
csharp 1.cs 63ms 0.6ms 24.8MB 47ms 0ms dotnet/aot 9.0.300
nim 1.nim 63ms 1.6ms 11.8MB 53ms 0ms nim/clang 2.2.4
csharp 1.cs 99ms 2.3ms 42.3MB 77ms 7ms dotnet 9.0.300
csharp 2.cs 102ms 1.9ms 11.9MB 90ms 0ms dotnet/aot 9.0.300
csharp 2.cs 129ms 0.7ms 29.9MB 113ms 7ms dotnet 9.0.300
csharp 1.cs 144ms 1.4ms 36.4MB 130ms 3ms mono 6.12.0
csharp 2.cs 494ms 11ms 21.5MB 480ms 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 1651ms 5.5ms 151.9MB 1620ms 13ms nim/clang 2.2.4
nim 1.nim 1683ms 16ms 152.1MB 1650ms 20ms nim 2.2.4
csharp 6.cs 1758ms 15ms 418.7MB 1653ms 153ms dotnet/aot 9.0.300
csharp 5.cs 2138ms 7.7ms 443.4MB 2173ms 187ms dotnet 9.0.300
csharp 6.cs 2760ms 95ms 438.8MB 2717ms 170ms dotnet 9.0.300
csharp 5.cs 4264ms 20ms 419.0MB 4173ms 147ms dotnet/aot 9.0.300

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 174ms 3.4ms 17.6MB 160ms 0ms nim/clang 2.2.4
nim 1.nim 176ms 3.6ms 17.2MB 163ms 0ms nim 2.2.4
csharp 6.cs 189ms 0.8ms 47.5MB 163ms 17ms dotnet/aot 9.0.300
csharp 5.cs 291ms 6.5ms 72.6MB 260ms 30ms dotnet 9.0.300
csharp 6.cs 396ms 4.6ms 70.3MB 357ms 33ms dotnet 9.0.300
csharp 5.cs 439ms 1.8ms 47.4MB 413ms 20ms dotnet/aot 9.0.300

spectral-norm

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 3-m.cs 1877ms 33ms 10.4MB 7243ms 3ms dotnet/aot 9.0.300
csharp 3-m.cs 1988ms 108ms 30.3MB 7253ms 20ms dotnet 9.0.300
nim 1.nim 3587ms 2.7ms 1.6MB 3580ms 0ms nim/clang 2.2.4
nim 1.nim 3610ms 12ms 1.4MB 3597ms 0ms nim 2.2.4
csharp 3-m.cs 4713ms 116ms 24.7MB 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 475ms 1.5ms 10.5MB 1810ms 0ms dotnet/aot 9.0.300
csharp 3-m.cs 535ms 3.2ms 30.1MB 1887ms 10ms dotnet 9.0.300
nim 1.nim 899ms 0.8ms 1.5MB 890ms 0ms nim/clang 2.2.4
nim 1.nim 902ms 1.4ms 1.3MB 893ms 0ms nim 2.2.4
csharp 3-m.cs 1236ms 42ms 25.8MB 4650ms 7ms mono 6.12.0

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 3-m.cs 128ms 1.5ms 10.5MB 450ms 0ms dotnet/aot 9.0.300
csharp 3-m.cs 176ms 1.1ms 28.5MB 503ms 10ms dotnet 9.0.300
nim 1.nim 226ms 0.1ms 1.5MB 220ms 0ms nim/clang 2.2.4
nim 1.nim 229ms 1.9ms 1.3MB 220ms 0ms nim 2.2.4
csharp 3-m.cs 356ms 11ms 25.4MB 1197ms 3ms mono 6.12.0