Programming Language and compiler
Benchmarks

Nim VS D 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
nim 2.nim 971ms 5.9ms 35.2MB 953ms 3ms nim/clang 2.2.4
d 1.d 1782ms 3.3ms 312.5MB 1753ms 37ms ldc2 1.40.1
d 1.d 3057ms 15ms 314.4MB 3227ms 60ms dmd 2.111.0

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
d 1.d 167ms 2.7ms 207.7MB 140ms 13ms ldc2 1.40.1
d 1.d 262ms 1.0ms 210.5MB 233ms 17ms dmd 2.111.0

coro-prime-sieve

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d timeout 0.0ms 18.2MB 4963ms 20ms dmd 2.111.0
d 1.d timeout 0.0ms 17.6MB 4963ms 23ms ldc2 1.40.1
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
d 1.d 1046ms 5.9ms 10.5MB 1017ms 13ms ldc2 1.40.1
d 1.d 1385ms 4.2ms 12.0MB 1360ms 13ms dmd 2.111.0
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
d 1.d 154ms 1.7ms 2.9MB 143ms 0ms ldc2 1.40.1
nim 2.nim 188ms 2.8ms 1.5MB 180ms 0ms nim 2.2.4
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
d 1.d 643ms 4.3ms 4.8MB 630ms 0ms dmd 2.111.0

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 19ms 1.1ms 2.9MB 10ms 0ms ldc2 1.40.1
nim 2.nim 22ms 0.7ms 1.5MB 10ms 0ms nim 2.2.4
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
d 1.d 67ms 0.4ms 4.6MB 60ms 0ms dmd 2.111.0

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
d 1.d 1.7ms 0.1ms 2.9MB 0ms 0ms ldc2 1.40.1
d 1.d 1.9ms 0.1ms 5.1MB 0ms 0ms dmd 2.111.0

lru

Input: 1000 1000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
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
d 1.d 131ms 0.7ms 6.2MB 120ms 0ms ldc2 1.40.1
d 1.d 176ms 0.9ms 8.0MB 167ms 3ms dmd 2.111.0
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
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
d 1.d 377ms 0.9ms 5.9MB 367ms 13ms ldc2 1.40.1
d 1.d 516ms 1.8ms 8.1MB 510ms 10ms dmd 2.111.0
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
nim 2.nim 52ms 1.0ms 1.3MB 43ms 0ms nim 2.2.4
d 1.d 56ms 0.4ms 6.1MB 47ms 0ms ldc2 1.40.1
d 1.d 79ms 1.8ms 7.9MB 70ms 0ms dmd 2.111.0
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

mandelbrot

Input: 5000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 295ms 0.5ms 7.4MB 283ms 0ms ldc2 1.40.1
nim 1.nim 387ms 0.4ms 4.8MB 380ms 0ms nim/clang 2.2.4
nim 1.nim 576ms 1.5ms 4.5MB 563ms 0ms nim 2.2.4
d 1.d 2153ms 61ms 9.4MB 2143ms 0ms dmd 2.111.0

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 15ms 0.6ms 3.0MB 10ms 0ms ldc2 1.40.1
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
d 1.d 92ms 3.0ms 5.0MB 83ms 0ms dmd 2.111.0

merkletrees

Input: 17

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 552ms 1.9ms 34.9MB 530ms 7ms nim 2.2.4
nim 1.nim 634ms 34ms 35.2MB 613ms 10ms nim/clang 2.2.4
d 1.d 968ms 7.6ms 312.4MB 933ms 40ms ldc2 1.40.1
d 1.d 1870ms 35ms 314.3MB 2007ms 47ms dmd 2.111.0

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
d 1.d 199ms 1.4ms 312.5MB 160ms 30ms ldc2 1.40.1
d 1.d 360ms 4.0ms 314.8MB 323ms 33ms dmd 2.111.0

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
d 2.d 360ms 0.1ms 2.9MB 350ms 0ms ldc2 1.40.1
d 1.d 360ms 0.6ms 2.9MB 350ms 0ms ldc2 1.40.1
d 1.d 680ms 2.4ms 4.8MB 670ms 0ms dmd 2.111.0
d 2.d 2035ms 5.7ms 4.6MB 2023ms 0ms dmd 2.111.0

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
d 1.d 38ms 0.1ms 2.9MB 30ms 0ms ldc2 1.40.1
d 2.d 39ms 0.6ms 2.9MB 30ms 0ms ldc2 1.40.1
nim 2.nim 40ms 6.2ms 2.0MB 33ms 0ms nim/clang 2.2.4
d 1.d 72ms 1.0ms 4.8MB 60ms 0ms dmd 2.111.0
d 2.d 208ms 2.5ms 4.8MB 197ms 0ms dmd 2.111.0

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
d 1.d 321ms 12ms 45.7MB 303ms 3ms ldc2 1.40.1
d 1.d 359ms 12ms 79.2MB 347ms 0ms dmd 2.111.0
d 2.d 849ms 1.3ms 47.5MB 830ms 10ms ldc2 1.40.1
d 2.d 1178ms 13ms 51.8MB 1160ms 10ms dmd 2.111.0

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
d 1.d 62ms 2.0ms 15.7MB 50ms 0ms ldc2 1.40.1
nim 1.nim 63ms 1.6ms 11.8MB 53ms 0ms nim/clang 2.2.4
d 1.d 75ms 1.6ms 25.5MB 63ms 0ms dmd 2.111.0
d 2.d 210ms 2.6ms 17.6MB 197ms 0ms ldc2 1.40.1
d 2.d 292ms 1.6ms 19.6MB 277ms 0ms dmd 2.111.0

regex-redux

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 3.d 569ms 12ms 172.2MB 747ms 20ms ldc2 1.40.1
d 3.d 1198ms 6.4ms 175.1MB 1387ms 20ms dmd 2.111.0
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

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 3.d 63ms 1.2ms 26.2MB 70ms 3ms ldc2 1.40.1
d 3.d 128ms 1.2ms 31.7MB 143ms 0ms dmd 2.111.0
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

spectral-norm

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 3587ms 2.7ms 1.6MB 3580ms 0ms nim/clang 2.2.4
d 1.d 3596ms 3.2ms 3.9MB 3583ms 0ms ldc2 1.40.1
nim 1.nim 3610ms 12ms 1.4MB 3597ms 0ms nim 2.2.4
d 1.d 3660ms 2.7ms 6.0MB 3650ms 0ms dmd 2.111.0

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 899ms 0.8ms 1.5MB 890ms 0ms nim/clang 2.2.4
d 1.d 902ms 2.2ms 3.5MB 890ms 0ms ldc2 1.40.1
nim 1.nim 902ms 1.4ms 1.3MB 893ms 0ms nim 2.2.4
d 1.d 926ms 1.0ms 7.9MB 917ms 0ms dmd 2.111.0

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
nim 1.nim 226ms 0.1ms 1.5MB 220ms 0ms nim/clang 2.2.4
d 1.d 228ms 0.6ms 3.1MB 220ms 0ms ldc2 1.40.1
nim 1.nim 229ms 1.9ms 1.3MB 220ms 0ms nim 2.2.4
d 1.d 234ms 1.2ms 4.9MB 223ms 0ms dmd 2.111.0