Programming Language and compiler
Benchmarks

D VS C 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
d 1.d 2206ms 5.4ms 312.8MB 2170ms 43ms ldc2 1.41.0
d 1.d 3040ms 21ms 314.5MB 3210ms 57ms dmd 2.111.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 207ms 3.1ms 207.9MB 183ms 13ms ldc2 1.41.0
d 1.d 262ms 1.5ms 210.9MB 233ms 13ms 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 16.5MB 4957ms 30ms dmd 2.111.0
d 1.d timeout 0.0ms 16.6MB 4963ms 23ms ldc2 1.41.0

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 1049ms 6.5ms 10.3MB 1020ms 17ms ldc2 1.41.0
d 1.d 1387ms 5.6ms 12.1MB 1367ms 10ms dmd 2.111.0

edigits

Input: 250001

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 2551ms 3.5ms 8.0MB 2540ms 0ms ldc2 1.41.0
d 1.d 2871ms 10ms 10.5MB 2860ms 0ms dmd 2.111.0

Input: 100000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 444ms 2.0ms 8.1MB 437ms 0ms ldc2 1.41.0
d 1.d 517ms 1.2ms 10.5MB 510ms 0ms dmd 2.111.0

fannkuch-redux

Input: 11

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1-im.d 373ms 5.6ms 3.1MB 1427ms 0ms ldc2 1.41.0
d 2-im.d 1114ms 9.3ms 3.0MB 4320ms 0ms ldc2 1.41.0
d 1-i.d 1488ms 1.7ms 2.9MB 1480ms 0ms ldc2 1.41.0
d 1.d 3143ms 19ms 2.9MB 3130ms 0ms ldc2 1.41.0
d 2-i.d 3232ms 3.6ms 2.9MB 3223ms 0ms ldc2 1.41.0
d 1.d 3544ms 3.7ms 4.6MB 3533ms 0ms dmd 2.111.0
d 1-im.d 4461ms 9.7ms 5.3MB 17560ms 0ms dmd 2.111.0
d 1-i.d timeout 0.0ms 4.6MB 4990ms 0ms dmd 2.111.0
d 2-i.d timeout 0.0ms 4.6MB 4990ms 0ms dmd 2.111.0
d 2-im.d timeout 0.0ms 4.9MB 19740ms 20ms dmd 2.111.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1-im.d 36ms 0.9ms 3.1MB 110ms 0ms ldc2 1.41.0
d 2-im.d 98ms 1.6ms 3.0MB 347ms 0ms ldc2 1.41.0
d 1-i.d 124ms 0.3ms 2.9MB 120ms 0ms ldc2 1.41.0
d 1.d 265ms 3.5ms 2.9MB 257ms 0ms ldc2 1.41.0
d 2-i.d 266ms 1.0ms 2.9MB 260ms 0ms ldc2 1.41.0
d 1.d 300ms 2.1ms 4.6MB 290ms 0ms dmd 2.111.0
d 1-im.d 402ms 34ms 4.8MB 1410ms 0ms dmd 2.111.0
d 2-im.d 524ms 3.0ms 4.9MB 2003ms 0ms dmd 2.111.0
d 1-i.d 887ms 8.9ms 4.5MB 877ms 0ms dmd 2.111.0
d 2-i.d 1393ms 4.6ms 4.5MB 1383ms 0ms dmd 2.111.0

fasta

Input: 2500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 109ms 0.2ms 2.9MB 100ms 0ms ldc2 1.41.0
d 1.d 641ms 3.8ms 4.9MB 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 14ms 1.5ms 3.0MB 10ms 0ms ldc2 1.41.0
d 1.d 68ms 0.9ms 4.8MB 60ms 0ms dmd 2.111.0

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
c 1.c 1.2ms 0.0ms 2.1MB 0ms 0ms gcc 15.1.0
c 1.c 1.3ms 0.1ms 2.1MB 0ms 0ms clang 14.0.0-1ubuntu1.1
c 1.c 1.3ms 0.2ms 1.3MB 0ms 0ms zigcc 0.14.1
d 1.d 1.7ms 0.1ms 3.0MB 0ms 0ms ldc2 1.41.0
d 1.d 2.2ms 0.1ms 5.1MB 0ms 0ms dmd 2.111.0

json-serde

Input: sample 5000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 2.d 59ms 1.7ms 15.7MB 63ms 7ms ldc2 1.41.0
d 2.d 241ms 3.0ms 22.5MB 247ms 3ms dmd 2.111.0

Input: canada 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 2.d 483ms 11ms 140.4MB 450ms 37ms ldc2 1.41.0
d 2.d 2474ms 16ms 158.3MB 2490ms 33ms dmd 2.111.0

knucleotide

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
c 1-m.c 171ms 3.7ms 24.2MB 403ms 10ms gcc 15.1.0
c 1-m.c 298ms 5.1ms 25.7MB 993ms 23ms clang 14.0.0-1ubuntu1.1
d 1-m.d 713ms 31ms 47.5MB 2403ms 10ms ldc2 1.41.0
d 1-m.d 2035ms 101ms 50.6MB 6757ms 17ms dmd 2.111.0

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
c 1-m.c 28ms 1.2ms 13.6MB 60ms 0ms gcc 15.1.0
c 1-m.c 39ms 0.8ms 15.0MB 110ms 0ms clang 14.0.0-1ubuntu1.1
d 1-m.d 100ms 4.7ms 39.5MB 263ms 10ms ldc2 1.41.0
d 1-m.d 257ms 16ms 41.0MB 737ms 17ms dmd 2.111.0

lru

Input: 1000 1000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 130ms 1.9ms 5.9MB 120ms 0ms ldc2 1.41.0
d 1.d 178ms 3.2ms 7.9MB 167ms 3ms dmd 2.111.0

Input: 1000 3000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 385ms 2.3ms 5.9MB 370ms 17ms ldc2 1.41.0
d 1.d 520ms 2.3ms 7.9MB 513ms 13ms dmd 2.111.0

Input: 100 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 58ms 1.2ms 5.9MB 50ms 0ms ldc2 1.41.0
d 1.d 79ms 1.3ms 8.1MB 67ms 0ms dmd 2.111.0

mandelbrot

Input: 5000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
c 1-mffi.c 231ms 18ms 7.6MB 853ms 10ms clang 14.0.0-1ubuntu1.1
c 1-mffi.c 264ms 0.4ms 6.6MB 820ms 0ms gcc 15.1.0
c 1-mffi.c 331ms 2.3ms 6.0MB 320ms 0ms zigcc 0.14.1
c 1-ffi.c 332ms 1.4ms 6.1MB 320ms 0ms zigcc 0.14.1
d 1.d 367ms 0.5ms 7.5MB 360ms 0ms ldc2 1.41.0
c 1-ffi.c 455ms 3.6ms 6.5MB 443ms 0ms clang 14.0.0-1ubuntu1.1
c 1-ffi.c 542ms 0.4ms 6.8MB 530ms 0ms gcc 15.1.0
d 1.d 2120ms 5.9ms 9.4MB 2107ms 0ms dmd 2.111.0

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
c 1-mffi.c 16ms 0.8ms 4.5MB 40ms 0ms clang 14.0.0-1ubuntu1.1
c 1-ffi.c 16ms 0.2ms 3.0MB 10ms 0ms zigcc 0.14.1
c 1-mffi.c 16ms 0.2ms 3.0MB 10ms 0ms zigcc 0.14.1
d 1.d 18ms 0.4ms 3.0MB 10ms 0ms ldc2 1.41.0
c 1-mffi.c 18ms 0.4ms 3.6MB 43ms 0ms gcc 15.1.0
c 1-ffi.c 24ms 5.3ms 3.6MB 13ms 0ms clang 14.0.0-1ubuntu1.1
c 1-ffi.c 26ms 0.9ms 3.9MB 20ms 0ms gcc 15.1.0
d 1.d 93ms 2.8ms 4.9MB 87ms 0ms dmd 2.111.0

merkletrees

Input: 17

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 1134ms 3.1ms 312.6MB 1097ms 40ms ldc2 1.41.0
d 1.d 1870ms 15ms 314.9MB 2007ms 47ms dmd 2.111.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 232ms 1.5ms 312.8MB 190ms 30ms ldc2 1.41.0
d 1.d 361ms 4.2ms 314.8MB 330ms 30ms dmd 2.111.0

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
c 8-i.c 269ms 3.0ms 1.5MB 260ms 0ms zigcc 0.14.1
c 8-i.c 300ms 0.9ms 2.1MB 290ms 0ms clang 14.0.0-1ubuntu1.1
c 2.c 309ms 1.8ms 2.3MB 300ms 0ms gcc 15.1.0
c 2.c 313ms 2.3ms 1.5MB 300ms 0ms zigcc 0.14.1
c 5.c 313ms 0.7ms 2.3MB 300ms 0ms gcc 15.1.0
c 5.c 315ms 0.5ms 1.5MB 307ms 0ms zigcc 0.14.1
c 5.c 317ms 2.1ms 2.1MB 310ms 0ms clang 14.0.0-1ubuntu1.1
c 2.c 318ms 2.8ms 2.1MB 310ms 0ms clang 14.0.0-1ubuntu1.1
c 8-i.c 337ms 0.8ms 2.3MB 330ms 0ms gcc 15.1.0
d 1.d 361ms 1.2ms 2.9MB 350ms 0ms ldc2 1.41.0
d 2.d 361ms 0.9ms 2.9MB 350ms 0ms ldc2 1.41.0
d 1.d 677ms 14ms 4.8MB 667ms 0ms dmd 2.111.0
d 2.d 2033ms 5.4ms 4.8MB 2023ms 0ms dmd 2.111.0

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
c 8-i.c 29ms 0.5ms 1.5MB 20ms 0ms zigcc 0.14.1
c 8-i.c 33ms 0.5ms 2.1MB 27ms 0ms clang 14.0.0-1ubuntu1.1
c 2.c 33ms 0.3ms 1.5MB 30ms 0ms zigcc 0.14.1
c 2.c 34ms 0.5ms 2.3MB 23ms 0ms gcc 15.1.0
c 5.c 34ms 0.6ms 2.3MB 30ms 0ms gcc 15.1.0
c 5.c 34ms 0.1ms 1.5MB 30ms 0ms zigcc 0.14.1
c 2.c 34ms 0.9ms 2.1MB 30ms 0ms clang 14.0.0-1ubuntu1.1
c 5.c 35ms 0.9ms 2.1MB 30ms 0ms clang 14.0.0-1ubuntu1.1
c 8-i.c 36ms 0.4ms 2.3MB 30ms 0ms gcc 15.1.0
d 1.d 39ms 0.6ms 2.9MB 30ms 0ms ldc2 1.41.0
d 2.d 39ms 0.7ms 2.9MB 30ms 0ms ldc2 1.41.0
d 1.d 71ms 1.2ms 4.6MB 60ms 0ms dmd 2.111.0
d 2.d 210ms 1.7ms 4.8MB 200ms 0ms dmd 2.111.0

nsieve

Input: 12

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
c 1.c 280ms 23ms 41.1MB 263ms 0ms gcc 15.1.0
c 1.c 300ms 13ms 40.3MB 283ms 0ms zigcc 0.14.1
c 1.c 311ms 7.1ms 40.8MB 293ms 0ms clang 14.0.0-1ubuntu1.1
d 1.d 344ms 7.7ms 45.7MB 323ms 7ms ldc2 1.41.0
d 1.d 385ms 4.2ms 79.2MB 370ms 0ms dmd 2.111.0
d 2.d 854ms 0.6ms 49.7MB 833ms 10ms ldc2 1.41.0
d 2.d 1168ms 1.5ms 49.3MB 1150ms 10ms dmd 2.111.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
c 1.c 52ms 3.9ms 11.8MB 43ms 0ms gcc 15.1.0
c 1.c 53ms 3.3ms 11.7MB 43ms 0ms clang 14.0.0-1ubuntu1.1
c 1.c 58ms 2.4ms 11.0MB 50ms 0ms zigcc 0.14.1
d 1.d 63ms 4.3ms 15.7MB 53ms 0ms ldc2 1.41.0
d 1.d 78ms 3.7ms 25.3MB 67ms 0ms dmd 2.111.0
d 2.d 211ms 1.2ms 17.8MB 200ms 0ms ldc2 1.41.0
d 2.d 297ms 1.9ms 19.7MB 280ms 0ms dmd 2.111.0

pidigits

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 2454ms 24ms 8.0MB 2420ms 417ms ldc2 1.41.0
d 1.d 4480ms 3.9ms 10.5MB 4400ms 500ms dmd 2.111.0

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 587ms 3.4ms 8.1MB 567ms 103ms ldc2 1.41.0
d 1.d 1068ms 6.3ms 10.4MB 1033ms 127ms 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 584ms 5.1ms 172.3MB 770ms 20ms ldc2 1.41.0
d 3.d 1204ms 8.1ms 177.4MB 1390ms 27ms dmd 2.111.0

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 3.d 63ms 1.5ms 28.5MB 70ms 0ms ldc2 1.41.0
d 3.d 126ms 0.1ms 31.6MB 133ms 3ms dmd 2.111.0

secp256k1

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 4780ms 18ms 4.1MB 4747ms 363ms ldc2 1.41.0
d 1.d timeout 0.0ms 6.5MB 4950ms 303ms dmd 2.111.0

Input: 500

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 1200ms 1.8ms 3.9MB 1177ms 93ms ldc2 1.41.0
d 1.d 2059ms 9.1ms 6.5MB 2030ms 123ms dmd 2.111.0

spectral-norm

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
c 3-m.c 737ms 1.3ms 2.0MB 2893ms 0ms gcc 15.1.0
c 6-im.c 953ms 1.8ms 2.0MB 3750ms 0ms gcc 15.1.0
c 4-m.c 988ms 1.5ms 2.0MB 3890ms 0ms gcc 15.1.0
c 6-im.c 1003ms 2.1ms 3.3MB 3940ms 0ms clang 14.0.0-1ubuntu1.1
c 4-m.c 1120ms 3.0ms 3.3MB 4407ms 0ms clang 14.0.0-1ubuntu1.1
c 5-im.c 1161ms 30ms 2.0MB 4523ms 0ms gcc 15.1.0
c 5-im.c 1334ms 14ms 3.3MB 5230ms 0ms clang 14.0.0-1ubuntu1.1
c 3-m.c 1836ms 7.3ms 3.3MB 7223ms 7ms clang 14.0.0-1ubuntu1.1
d 1.d 3599ms 3.4ms 4.0MB 3590ms 0ms ldc2 1.41.0
d 1.d 3649ms 20ms 5.9MB 3640ms 0ms dmd 2.111.0

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
c 3-m.c 194ms 0.6ms 2.0MB 737ms 0ms gcc 15.1.0
c 6-im.c 245ms 0.6ms 2.0MB 940ms 0ms gcc 15.1.0
c 6-im.c 258ms 0.7ms 3.3MB 990ms 0ms clang 14.0.0-1ubuntu1.1
c 4-m.c 258ms 0.4ms 2.0MB 997ms 0ms gcc 15.1.0
c 4-m.c 287ms 0.2ms 3.3MB 1103ms 0ms clang 14.0.0-1ubuntu1.1
c 5-im.c 295ms 3.4ms 2.0MB 1137ms 0ms gcc 15.1.0
c 5-im.c 342ms 1.7ms 3.3MB 1310ms 0ms clang 14.0.0-1ubuntu1.1
c 3-m.c 464ms 1.1ms 3.3MB 1803ms 0ms clang 14.0.0-1ubuntu1.1
d 1.d 903ms 2.0ms 3.5MB 893ms 0ms ldc2 1.41.0
d 1.d 917ms 3.9ms 5.3MB 907ms 0ms dmd 2.111.0

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
c 3-m.c 56ms 0.8ms 2.0MB 197ms 0ms gcc 15.1.0
c 6-im.c 68ms 0.4ms 2.3MB 247ms 0ms gcc 15.1.0
c 6-im.c 71ms 0.2ms 3.4MB 250ms 0ms clang 14.0.0-1ubuntu1.1
c 4-m.c 72ms 0.5ms 2.0MB 260ms 0ms gcc 15.1.0
c 4-m.c 78ms 0.6ms 3.3MB 280ms 0ms clang 14.0.0-1ubuntu1.1
c 5-im.c 80ms 0.4ms 2.0MB 293ms 0ms gcc 15.1.0
c 5-im.c 93ms 1.9ms 3.3MB 333ms 0ms clang 14.0.0-1ubuntu1.1
c 3-m.c 123ms 0.4ms 3.3MB 453ms 0ms clang 14.0.0-1ubuntu1.1
d 1.d 229ms 1.7ms 3.1MB 220ms 0ms ldc2 1.41.0
d 1.d 233ms 0.2ms 5.0MB 220ms 0ms dmd 2.111.0