Programming Language and compiler
Benchmarks

C# VS Nim benchmarks

Current benchmark data was generated on Tue Jul 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 819ms 29ms 34.4MB 800ms 0ms nim 2.2.4
nim 2.nim 968ms 6.2ms 35.2MB 950ms 3ms nim/clang 2.2.4
csharp 1.cs 987ms 1.3ms 197.6MB 1000ms 140ms dotnet 9.0.301
csharp 1.cs 1008ms 13ms 179.9MB 1017ms 137ms dotnet/aot 9.0.301
csharp 1.cs 1685ms 31ms 103.5MB 1857ms 217ms mono 6.12.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 77ms 2.5ms 5.5MB 70ms 0ms nim 2.2.4
nim 2.nim 93ms 2.5ms 5.8MB 80ms 0ms nim/clang 2.2.4
csharp 1.cs 122ms 5.7ms 36.6MB 90ms 30ms dotnet/aot 9.0.301
csharp 1.cs 142ms 0.8ms 41.9MB 120ms 13ms mono 6.12.0
csharp 1.cs 203ms 6.4ms 50.0MB 157ms 33ms dotnet 9.0.301

coro-prime-sieve

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 1-m.cs 2289ms 142ms 50.7MB 8040ms 73ms dotnet/aot 9.0.301
csharp 1-m.cs 2934ms 143ms 73.2MB 10080ms 107ms dotnet 9.0.301
nim 1.nim timeout 0.0ms 572.1MB 2667ms 1857ms nim 2.2.4
nim 1.nim timeout 0.0ms 574.6MB 2610ms 1913ms 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 150ms 2.1ms 18.5MB 430ms 7ms dotnet/aot 9.0.301
csharp 1-m.cs 290ms 28ms 40.0MB 830ms 27ms dotnet 9.0.301
nim 1.nim 4108ms 3.9ms 518.6MB 2127ms 1553ms nim/clang 2.2.4
nim 1.nim 4147ms 34ms 519.4MB 2150ms 1567ms nim 2.2.4

edigits

Input: 250001

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 1.cs 4114ms 9.3ms 18.4MB 4090ms 10ms dotnet/aot 9.0.301
csharp 1.cs 4957ms 5.7ms 37.8MB 4930ms 20ms dotnet 9.0.301

Input: 100000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 1.cs 681ms 1.0ms 14.6MB 660ms 3ms dotnet/aot 9.0.301
csharp 1.cs 884ms 5.5ms 34.0MB 857ms 10ms dotnet 9.0.301

fasta

Input: 2500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 5-m.cs 137ms 2.4ms 25.0MB 370ms 107ms dotnet/aot 9.0.301
nim 2.nim 189ms 1.3ms 1.5MB 180ms 0ms nim 2.2.4
csharp 5-m.cs 190ms 2.4ms 39.6MB 470ms 117ms dotnet 9.0.301
csharp 5-m.cs 227ms 8.2ms 45.5MB 643ms 93ms mono 6.12.0
nim 2.nim 242ms 1.4ms 1.8MB 230ms 0ms nim/clang 2.2.4
nim 1.nim 539ms 0.9ms 1.8MB 447ms 80ms nim/clang 2.2.4
nim 1.nim 562ms 2.0ms 1.5MB 467ms 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 1.0ms 1.5MB 10ms 0ms nim 2.2.4
csharp 5-m.cs 25ms 0.9ms 16.0MB 40ms 13ms dotnet/aot 9.0.301
nim 2.nim 26ms 0.3ms 1.6MB 20ms 0ms nim/clang 2.2.4
nim 1.nim 56ms 0.7ms 1.9MB 40ms 7ms nim/clang 2.2.4
nim 1.nim 58ms 0.5ms 1.5MB 43ms 0ms nim 2.2.4
csharp 5-m.cs 67ms 3.3ms 37.1MB 90ms 20ms dotnet 9.0.301
csharp 5-m.cs 71ms 2.0ms 31.3MB 100ms 23ms 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 1.8MB 0ms 0ms nim/clang 2.2.4
csharp 1.cs 6.3ms 0.3ms 8.3MB 0ms 0ms dotnet/aot 9.0.301
csharp 1.cs 32ms 1.0ms 21.2MB 20ms 0ms mono 6.12.0
csharp 1.cs 38ms 1.2ms 26.3MB 20ms 4ms dotnet 9.0.301

http-server

Input: 3000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 2-http2.cs 552ms 7.6ms 108.9MB 773ms 150ms dotnet 9.0.301
csharp 2-m.cs 625ms 6.3ms 147.0MB 797ms 533ms dotnet 9.0.301
csharp 2-http3.cs 717ms 3.8ms 145.7MB 1173ms 253ms dotnet 9.0.301
csharp 1-m.cs 756ms 9.5ms 170.9MB 1177ms 713ms dotnet 9.0.301

Input: 500

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 2-m.cs 376ms 9.3ms 87.8MB 420ms 190ms dotnet 9.0.301
csharp 1-m.cs 415ms 12ms 98.2MB 577ms 220ms dotnet 9.0.301
csharp 2-http2.cs 474ms 3.3ms 86.0MB 540ms 93ms dotnet 9.0.301
csharp 2-http3.cs 536ms 12ms 93.9MB 627ms 123ms dotnet 9.0.301

json-serde

Input: sample 5000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 2.cs 315ms 1.5ms 68.7MB 280ms 33ms dotnet 9.0.301
csharp 1.cs 812ms 57ms 143.7MB 833ms 87ms dotnet 9.0.301

Input: canada 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 2.cs 1553ms 67ms 233.5MB 1740ms 90ms dotnet 9.0.301
csharp 1.cs 2799ms 121ms 763.8MB 3280ms 460ms dotnet 9.0.301

knucleotide

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 6-m.cs 455ms 12ms 46.3MB 1230ms 20ms dotnet/aot 9.0.301
csharp 6-m.cs 970ms 98ms 69.4MB 2217ms 33ms dotnet 9.0.301
csharp 6-m.cs 1026ms 21ms 65.9MB 2957ms 27ms mono 6.12.0

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 6-m.cs 97ms 1.6ms 34.2MB 163ms 13ms dotnet/aot 9.0.301
csharp 6-m.cs 193ms 6.1ms 57.7MB 283ms 30ms dotnet 9.0.301
csharp 6-m.cs 203ms 4.9ms 59.6MB 390ms 23ms mono 6.12.0

lru

Input: 1000 1000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 2.cs 99ms 0.6ms 9.8MB 90ms 0ms dotnet/aot 9.0.301
nim 2.nim 111ms 2.3ms 1.9MB 103ms 0ms nim/clang 2.2.4
nim 2.nim 114ms 1.1ms 1.6MB 110ms 0ms nim 2.2.4
csharp 2.cs 147ms 1.2ms 22.9MB 133ms 0ms mono 6.12.0
csharp 2.cs 251ms 1.5ms 29.5MB 233ms 10ms dotnet 9.0.301
csharp 1.cs 1064ms 15ms 13.0MB 1043ms 3ms dotnet/aot 9.0.301
csharp 1.cs 1315ms 11ms 32.8MB 1303ms 17ms dotnet 9.0.301
csharp 1.cs 3373ms 24ms 45.5MB 3323ms 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 278ms 1.9ms 9.6MB 267ms 0ms dotnet/aot 9.0.301
nim 2.nim 326ms 1.8ms 1.6MB 317ms 0ms nim/clang 2.2.4
nim 2.nim 335ms 2.3ms 1.6MB 327ms 0ms nim 2.2.4
csharp 2.cs 363ms 4.6ms 22.7MB 347ms 0ms mono 6.12.0
csharp 2.cs 406ms 2.7ms 29.4MB 390ms 10ms dotnet 9.0.301
csharp 1.cs 3124ms 12ms 13.5MB 3100ms 13ms dotnet/aot 9.0.301
csharp 1.cs 4086ms 597ms 33.3MB 4063ms 23ms dotnet 9.0.301
csharp 1.cs timeout 0.0ms 45.8MB 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 0.7ms 1.5MB 40ms 0ms nim/clang 2.2.4
nim 2.nim 51ms 2.1ms 1.5MB 43ms 0ms nim 2.2.4
csharp 2.cs 56ms 2.8ms 10.1MB 40ms 0ms dotnet/aot 9.0.301
csharp 2.cs 94ms 2.2ms 22.8MB 77ms 3ms mono 6.12.0
csharp 2.cs 174ms 3.0ms 29.6MB 150ms 10ms dotnet 9.0.301
nim 1.nim 477ms 2.9ms 1.3MB 470ms 0ms nim 2.2.4
nim 1.nim 486ms 13ms 1.5MB 477ms 0ms nim/clang 2.2.4
csharp 1.cs 1631ms 16ms 32.4MB 1617ms 17ms dotnet 9.0.301
csharp 1.cs 1825ms 7.4ms 28.6MB 1813ms 0ms mono 6.12.0
csharp 1.cs 1831ms 2.3ms 12.9MB 1813ms 0ms dotnet/aot 9.0.301

mandelbrot

Input: 5000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 387ms 1.2ms 4.8MB 380ms 0ms nim/clang 2.2.4
csharp 4.cs 395ms 97ms 37.5MB 363ms 13ms dotnet 9.0.301
csharp 2.cs 569ms 58ms 39.7MB 540ms 17ms dotnet 9.0.301
nim 1.nim 578ms 3.9ms 4.5MB 567ms 0ms nim 2.2.4
csharp 1.cs 2043ms 15ms 36.7MB 2013ms 10ms dotnet 9.0.301
csharp 3.cs 2350ms 7.5ms 16.4MB 2333ms 0ms dotnet/aot 9.0.301
csharp 3.cs 2446ms 8.3ms 36.8MB 2423ms 7ms dotnet 9.0.301
csharp 1.cs 3943ms 49ms 16.3MB 3927ms 0ms dotnet/aot 9.0.301
csharp 1.cs timeout 0.0ms 22.4MB 4983ms 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 0.4ms 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 86ms 4.5ms 34.5MB 60ms 10ms dotnet 9.0.301
csharp 3.cs 109ms 2.8ms 13.3MB 97ms 0ms dotnet/aot 9.0.301
csharp 2.cs 130ms 29ms 36.8MB 107ms 10ms dotnet 9.0.301
csharp 1.cs 143ms 2.9ms 33.5MB 120ms 13ms dotnet 9.0.301
csharp 3.cs 173ms 9.2ms 33.9MB 150ms 10ms dotnet 9.0.301
csharp 1.cs 176ms 7.9ms 12.8MB 163ms 0ms dotnet/aot 9.0.301
csharp 1.cs 571ms 4.4ms 23.4MB 557ms 3ms mono 6.12.0

merkletrees

Input: 17

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 550ms 7.5ms 34.9MB 533ms 7ms nim 2.2.4
csharp 2.cs 551ms 10ms 119.2MB 507ms 87ms dotnet/aot 9.0.301
nim 1.nim 626ms 13ms 35.2MB 607ms 3ms nim/clang 2.2.4
csharp 1.cs 630ms 2.9ms 147.3MB 580ms 127ms dotnet/aot 9.0.301
csharp 2.cs 714ms 12ms 136.7MB 647ms 93ms dotnet 9.0.301
csharp 1.cs 753ms 7.5ms 167.4MB 700ms 133ms dotnet 9.0.301
csharp 1.cs 1373ms 35ms 139.5MB 1567ms 183ms mono 6.12.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 117ms 1.4ms 9.6MB 107ms 0ms nim 2.2.4
nim 1.nim 133ms 1.2ms 9.9MB 120ms 0ms nim/clang 2.2.4
csharp 2.cs 139ms 5.9ms 57.8MB 110ms 33ms dotnet/aot 9.0.301
csharp 1.cs 163ms 8.0ms 72.7MB 123ms 50ms dotnet/aot 9.0.301
csharp 2.cs 267ms 8.1ms 75.7MB 220ms 40ms dotnet 9.0.301
csharp 1.cs 276ms 1.5ms 89.7MB 243ms 53ms dotnet 9.0.301
csharp 1.cs 277ms 2.7ms 69.5MB 250ms 37ms mono 6.12.0

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 2.nim 319ms 1.6ms 1.8MB 310ms 0ms nim 2.2.4
nim 2.nim 341ms 1.3ms 2.0MB 330ms 0ms nim/clang 2.2.4
csharp 9.cs 365ms 5.3ms 27.6MB 343ms 10ms dotnet 9.0.301
csharp 8.cs 373ms 3.5ms 9.8MB 360ms 0ms dotnet/aot 9.0.301
csharp 8.cs 425ms 6.0ms 27.6MB 410ms 7ms dotnet 9.0.301
csharp 8.cs 1248ms 2.0ms 20.3MB 1230ms 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 0.7ms 2.0MB 30ms 0ms nim/clang 2.2.4
csharp 8.cs 46ms 1.5ms 9.9MB 30ms 0ms dotnet/aot 9.0.301
csharp 8.cs 97ms 3.2ms 27.5MB 77ms 7ms dotnet 9.0.301
csharp 9.cs 99ms 5.9ms 27.9MB 73ms 10ms dotnet 9.0.301
csharp 8.cs 168ms 3.1ms 22.4MB 153ms 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 281ms 9.2ms 41.5MB 270ms 0ms nim 2.2.4
nim 1.nim 314ms 3.5ms 41.8MB 303ms 0ms nim/clang 2.2.4
csharp 1.cs 361ms 7.5ms 96.3MB 333ms 17ms dotnet 9.0.301
csharp 1.cs 379ms 11ms 78.8MB 360ms 7ms dotnet/aot 9.0.301
csharp 2.cs 399ms 4.3ms 35.7MB 377ms 10ms dotnet 9.0.301
csharp 2.cs 423ms 2.5ms 17.5MB 410ms 0ms dotnet/aot 9.0.301
csharp 1.cs 584ms 14ms 83.9MB 560ms 10ms mono 6.12.0
csharp 2.cs 1886ms 26ms 29.8MB 1870ms 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 1.7ms 11.5MB 40ms 0ms nim 2.2.4
nim 1.nim 64ms 3.6ms 11.8MB 53ms 0ms nim/clang 2.2.4
csharp 1.cs 65ms 1.9ms 24.8MB 50ms 0ms dotnet/aot 9.0.301
csharp 1.cs 104ms 4.5ms 42.6MB 80ms 10ms dotnet 9.0.301
csharp 2.cs 110ms 2.4ms 12.1MB 100ms 0ms dotnet/aot 9.0.301
csharp 2.cs 129ms 3.8ms 30.1MB 110ms 7ms dotnet 9.0.301
csharp 1.cs 148ms 0.4ms 36.3MB 130ms 7ms mono 6.12.0
csharp 2.cs 487ms 4.8ms 21.1MB 473ms 0ms mono 6.12.0

pidigits

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 1.cs 3272ms 12ms 13.9MB 3167ms 100ms dotnet/aot 9.0.301
csharp 1.cs 3667ms 43ms 38.1MB 3650ms 133ms dotnet 9.0.301

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 1.cs 767ms 3.0ms 13.5MB 727ms 27ms dotnet/aot 9.0.301
csharp 1.cs 1011ms 7.1ms 37.6MB 1100ms 37ms dotnet 9.0.301

regex-redux

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 1641ms 6.1ms 151.9MB 1607ms 20ms nim/clang 2.2.4
nim 1.nim 1674ms 9.9ms 152.1MB 1640ms 20ms nim 2.2.4
csharp 6.cs 1757ms 7.6ms 418.7MB 1660ms 147ms dotnet/aot 9.0.301
csharp 5.cs 2065ms 6.3ms 442.7MB 2103ms 180ms dotnet 9.0.301
csharp 6.cs 2760ms 105ms 440.5MB 2710ms 180ms dotnet 9.0.301
csharp 5.cs 4197ms 15ms 419.1MB 4093ms 153ms dotnet/aot 9.0.301

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 173ms 1.8ms 16.8MB 160ms 0ms nim/clang 2.2.4
nim 1.nim 177ms 3.9ms 16.5MB 163ms 0ms nim 2.2.4
csharp 6.cs 191ms 1.6ms 48.1MB 167ms 17ms dotnet/aot 9.0.301
csharp 5.cs 299ms 13ms 72.7MB 267ms 33ms dotnet 9.0.301
csharp 6.cs 392ms 2.4ms 69.9MB 363ms 27ms dotnet 9.0.301
csharp 5.cs 437ms 3.0ms 48.1MB 417ms 13ms dotnet/aot 9.0.301

secp256k1

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 1.cs 2863ms 11ms 13.3MB 2823ms 30ms dotnet/aot 9.0.301
csharp 1.cs 2987ms 61ms 35.4MB 3060ms 40ms dotnet 9.0.301

Input: 500

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 1.cs 733ms 3.3ms 13.0MB 713ms 7ms dotnet/aot 9.0.301
csharp 1.cs 1008ms 4.1ms 35.4MB 1107ms 17ms dotnet 9.0.301

spectral-norm

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 3-m.cs 1871ms 1.6ms 10.5MB 7320ms 3ms dotnet/aot 9.0.301
csharp 3-m.cs 1923ms 1.9ms 30.0MB 7370ms 10ms dotnet 9.0.301
nim 1.nim 3588ms 2.7ms 1.6MB 3580ms 0ms nim/clang 2.2.4
nim 1.nim 3609ms 14ms 1.4MB 3603ms 0ms nim 2.2.4
csharp 3-m.cs 4682ms 158ms 27.7MB 17883ms 23ms mono 6.12.0

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 3-m.cs 488ms 17ms 10.5MB 1800ms 0ms dotnet/aot 9.0.301
csharp 3-m.cs 632ms 70ms 29.9MB 1737ms 20ms dotnet 9.0.301
nim 1.nim 899ms 0.7ms 1.5MB 890ms 0ms nim/clang 2.2.4
nim 1.nim 904ms 2.9ms 1.3MB 893ms 0ms nim 2.2.4
csharp 3-m.cs 1186ms 38ms 25.3MB 4467ms 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 136ms 11ms 10.5MB 447ms 7ms dotnet/aot 9.0.301
nim 1.nim 226ms 0.3ms 1.5MB 220ms 0ms nim/clang 2.2.4
nim 1.nim 229ms 0.9ms 1.3MB 220ms 0ms nim 2.2.4
csharp 3-m.cs 252ms 16ms 28.8MB 463ms 13ms dotnet 9.0.301
csharp 3-m.cs 345ms 3.8ms 27.6MB 1160ms 10ms mono 6.12.0