Programming Language and compiler
Benchmarks

D VS C benchmarks

Current benchmark data was generated on Fri Aug 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 2187ms 1.9ms 312.5MB 2160ms 33ms ldc2 1.41.0
d 1.d 3000ms 18ms 314.1MB 3163ms 50ms dmd 2.111.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 205ms 3.2ms 207.9MB 180ms 13ms ldc2 1.41.0
d 1.d 262ms 1.9ms 209.7MB 237ms 10ms 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 4970ms 17ms dmd 2.111.0
d 1.d timeout 0.0ms 17.5MB 4963ms 27ms ldc2 1.41.0

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 1058ms 5.4ms 10.2MB 1033ms 10ms ldc2 1.41.0
d 1.d 1373ms 11ms 12.5MB 1350ms 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 2555ms 1.6ms 8.1MB 2543ms 0ms ldc2 1.41.0
d 1.d 2870ms 7.3ms 10.4MB 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 443ms 3.2ms 8.1MB 430ms 0ms ldc2 1.41.0
d 1.d 517ms 0.4ms 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 374ms 6.5ms 3.0MB 1420ms 0ms ldc2 1.41.0
d 2-im.d 1109ms 4.2ms 3.0MB 4320ms 0ms ldc2 1.41.0
d 1-i.d 1489ms 0.4ms 2.9MB 1480ms 0ms ldc2 1.41.0
d 1.d 3152ms 15ms 2.9MB 3140ms 0ms ldc2 1.41.0
d 2-i.d 3224ms 2.6ms 2.9MB 3213ms 0ms ldc2 1.41.0
d 1.d 3538ms 5.1ms 4.6MB 3527ms 0ms dmd 2.111.0
d 1-im.d 4488ms 40ms 4.9MB 17597ms 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 19753ms 7ms 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 1.2ms 3.1MB 110ms 0ms ldc2 1.41.0
d 2-im.d 97ms 2.1ms 3.0MB 350ms 0ms ldc2 1.41.0
d 1-i.d 124ms 0.3ms 2.9MB 120ms 0ms ldc2 1.41.0
d 1.d 261ms 0.5ms 2.9MB 250ms 0ms ldc2 1.41.0
d 2-i.d 266ms 1.0ms 2.9MB 260ms 0ms ldc2 1.41.0
d 1.d 297ms 2.2ms 4.6MB 287ms 0ms dmd 2.111.0
d 1-im.d 376ms 0.8ms 4.8MB 1433ms 0ms dmd 2.111.0
d 2-im.d 525ms 3.2ms 5.1MB 2010ms 0ms dmd 2.111.0
d 1-i.d 880ms 8.2ms 4.6MB 870ms 0ms dmd 2.111.0
d 2-i.d 1375ms 1.1ms 4.6MB 1363ms 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 112ms 2.7ms 2.9MB 103ms 0ms ldc2 1.41.0
d 1.d 641ms 1.0ms 4.6MB 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 0.5ms 2.9MB 10ms 0ms ldc2 1.41.0
d 1.d 67ms 0.8ms 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 1.0ms 0.1ms 1.3MB 0ms 0ms zigcc 0.14.1
c 1.c 1.2ms 0.1ms 2.1MB 0ms 0ms gcc 15.1.0
d 1.d 1.6ms 0.1ms 2.9MB 0ms 0ms ldc2 1.41.0
c 1.c 1.6ms 0.7ms 2.1MB 0ms 0ms clang 14.0.0-1ubuntu1.1
d 1.d 2.0ms 0.2ms 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 58ms 1.1ms 15.9MB 60ms 7ms ldc2 1.41.0
d 2.d 237ms 2.6ms 22.6MB 240ms 7ms dmd 2.111.0

Input: canada 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 2.d 464ms 5.0ms 140.4MB 437ms 30ms ldc2 1.41.0
d 2.d 2479ms 20ms 158.4MB 2493ms 37ms 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 4.2ms 24.1MB 400ms 10ms gcc 15.1.0
c 1-m.c 293ms 1.6ms 25.7MB 1000ms 23ms clang 14.0.0-1ubuntu1.1
d 1-m.d 639ms 21ms 47.9MB 2073ms 10ms ldc2 1.41.0
d 1-m.d 1884ms 33ms 50.0MB 5657ms 13ms 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 27ms 1.3ms 13.6MB 60ms 0ms gcc 15.1.0
c 1-m.c 37ms 0.3ms 15.0MB 93ms 3ms clang 14.0.0-1ubuntu1.1
d 1-m.d 92ms 1.5ms 38.7MB 253ms 7ms ldc2 1.41.0
d 1-m.d 212ms 8.4ms 40.9MB 610ms 13ms 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 1.7ms 6.1MB 120ms 0ms ldc2 1.41.0
d 1.d 176ms 2.3ms 8.1MB 163ms 7ms dmd 2.111.0

Input: 1000 3000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 380ms 0.5ms 5.9MB 370ms 10ms ldc2 1.41.0
d 1.d 510ms 2.8ms 8.2MB 500ms 10ms dmd 2.111.0

Input: 100 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 57ms 1.3ms 5.9MB 50ms 0ms ldc2 1.41.0
d 1.d 79ms 0.2ms 7.9MB 70ms 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 219ms 4.3ms 7.6MB 810ms 10ms clang 14.0.0-1ubuntu1.1
c 1-mffi.c 264ms 0.9ms 6.6MB 810ms 0ms gcc 15.1.0
c 1-ffi.c 330ms 2.0ms 6.0MB 320ms 0ms zigcc 0.14.1
c 1-mffi.c 331ms 0.8ms 6.0MB 320ms 0ms zigcc 0.14.1
d 1.d 367ms 0.6ms 7.5MB 357ms 0ms ldc2 1.41.0
c 1-ffi.c 453ms 1.0ms 6.5MB 443ms 0ms clang 14.0.0-1ubuntu1.1
c 1-ffi.c 545ms 3.1ms 6.8MB 537ms 0ms gcc 15.1.0
d 1.d 2107ms 12ms 9.4MB 2097ms 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 15ms 1.2ms 4.8MB 30ms 0ms clang 14.0.0-1ubuntu1.1
c 1-ffi.c 16ms 0.3ms 3.0MB 10ms 0ms zigcc 0.14.1
c 1-mffi.c 16ms 0.4ms 3.0MB 10ms 0ms zigcc 0.14.1
c 1-mffi.c 16ms 1.2ms 3.8MB 40ms 0ms gcc 15.1.0
d 1.d 17ms 0.1ms 3.0MB 10ms 0ms ldc2 1.41.0
c 1-ffi.c 21ms 0.2ms 3.6MB 10ms 0ms clang 14.0.0-1ubuntu1.1
c 1-ffi.c 26ms 1.1ms 3.8MB 20ms 0ms gcc 15.1.0
d 1.d 91ms 2.3ms 4.6MB 83ms 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 1093ms 13ms 312.6MB 1057ms 37ms ldc2 1.41.0
d 1.d 1863ms 29ms 314.3MB 1990ms 47ms dmd 2.111.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 227ms 2.7ms 312.5MB 193ms 20ms ldc2 1.41.0
d 1.d 359ms 1.1ms 315.0MB 323ms 27ms 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 268ms 0.7ms 1.5MB 260ms 0ms zigcc 0.14.1
c 8-i.c 303ms 1.7ms 2.1MB 290ms 0ms clang 14.0.0-1ubuntu1.1
c 2.c 310ms 1.5ms 2.3MB 300ms 0ms gcc 15.1.0
c 2.c 312ms 1.1ms 1.5MB 300ms 0ms zigcc 0.14.1
c 5.c 314ms 2.4ms 2.3MB 303ms 0ms gcc 15.1.0
c 5.c 315ms 1.3ms 2.1MB 307ms 0ms clang 14.0.0-1ubuntu1.1
c 5.c 316ms 1.0ms 1.5MB 310ms 0ms zigcc 0.14.1
c 2.c 317ms 0.2ms 2.1MB 310ms 0ms clang 14.0.0-1ubuntu1.1
c 8-i.c 336ms 0.3ms 2.3MB 330ms 0ms gcc 15.1.0
d 1.d 361ms 0.5ms 2.9MB 350ms 0ms ldc2 1.41.0
d 2.d 361ms 1.4ms 2.9MB 350ms 0ms ldc2 1.41.0
d 1.d 683ms 2.2ms 4.8MB 673ms 0ms dmd 2.111.0
d 2.d 2033ms 7.1ms 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 32ms 0.4ms 2.1MB 23ms 0ms clang 14.0.0-1ubuntu1.1
c 5.c 34ms 0.4ms 2.3MB 30ms 0ms gcc 15.1.0
c 2.c 34ms 0.1ms 1.5MB 30ms 0ms zigcc 0.14.1
c 5.c 34ms 0.4ms 2.1MB 27ms 0ms clang 14.0.0-1ubuntu1.1
c 2.c 34ms 0.3ms 2.3MB 30ms 0ms gcc 15.1.0
c 2.c 34ms 0.4ms 2.1MB 30ms 0ms clang 14.0.0-1ubuntu1.1
c 5.c 34ms 0.6ms 1.5MB 30ms 0ms zigcc 0.14.1
c 8-i.c 36ms 0.2ms 2.3MB 30ms 0ms gcc 15.1.0
d 2.d 39ms 0.7ms 2.9MB 30ms 0ms ldc2 1.41.0
d 1.d 39ms 0.3ms 2.9MB 30ms 0ms ldc2 1.41.0
d 1.d 71ms 1.1ms 4.8MB 60ms 0ms dmd 2.111.0
d 2.d 208ms 2.9ms 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 266ms 3.7ms 40.9MB 250ms 0ms gcc 15.1.0
c 1.c 268ms 5.1ms 41.0MB 253ms 0ms clang 14.0.0-1ubuntu1.1
c 1.c 283ms 6.3ms 40.3MB 270ms 0ms zigcc 0.14.1
d 1.d 303ms 7.2ms 43.5MB 287ms 0ms ldc2 1.41.0
d 1.d 345ms 5.5ms 79.3MB 327ms 3ms dmd 2.111.0
d 2.d 846ms 5.3ms 47.7MB 827ms 7ms ldc2 1.41.0
d 2.d 1170ms 7.1ms 51.6MB 1150ms 7ms dmd 2.111.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
c 1.c 54ms 5.0ms 11.6MB 43ms 0ms gcc 15.1.0
c 1.c 55ms 3.1ms 11.7MB 43ms 0ms clang 14.0.0-1ubuntu1.1
c 1.c 59ms 2.4ms 11.0MB 50ms 0ms zigcc 0.14.1
d 1.d 64ms 2.7ms 15.7MB 53ms 0ms ldc2 1.41.0
d 1.d 75ms 1.7ms 25.5MB 67ms 0ms dmd 2.111.0
d 2.d 210ms 2.0ms 17.7MB 200ms 0ms ldc2 1.41.0
d 2.d 295ms 1.1ms 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 2445ms 17ms 8.1MB 2407ms 423ms ldc2 1.41.0
d 1.d 4429ms 2.9ms 10.5MB 4383ms 463ms dmd 2.111.0

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 582ms 3.3ms 8.2MB 557ms 110ms ldc2 1.41.0
d 1.d 1056ms 3.2ms 10.4MB 1033ms 110ms 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 1.7ms 172.2MB 767ms 20ms ldc2 1.41.0
d 3.d 1200ms 3.9ms 177.3MB 1387ms 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 0.8ms 26.3MB 70ms 0ms ldc2 1.41.0
d 3.d 126ms 0.9ms 31.7MB 137ms 0ms dmd 2.111.0

secp256k1

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 4859ms 111ms 4.3MB 4827ms 367ms ldc2 1.41.0
d 1.d timeout 0.0ms 6.5MB 4960ms 297ms dmd 2.111.0

Input: 500

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 1214ms 8.8ms 3.9MB 1190ms 100ms ldc2 1.41.0
d 1.d 2046ms 14ms 6.5MB 2037ms 100ms 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 744ms 14ms 2.0MB 2913ms 0ms gcc 15.1.0
c 6-im.c 951ms 1.1ms 2.0MB 3750ms 0ms gcc 15.1.0
c 4-m.c 990ms 3.6ms 2.1MB 3893ms 0ms gcc 15.1.0
c 6-im.c 1002ms 3.4ms 3.4MB 3940ms 0ms clang 14.0.0-1ubuntu1.1
c 4-m.c 1118ms 0.6ms 3.1MB 4400ms 3ms clang 14.0.0-1ubuntu1.1
c 5-im.c 1149ms 13ms 2.0MB 4520ms 0ms gcc 15.1.0
c 5-im.c 1338ms 17ms 3.3MB 5263ms 3ms clang 14.0.0-1ubuntu1.1
c 3-m.c 1841ms 23ms 3.3MB 7240ms 7ms clang 14.0.0-1ubuntu1.1
d 1.d 3597ms 3.2ms 6.2MB 3587ms 0ms ldc2 1.41.0
d 1.d 3655ms 25ms 8.4MB 3643ms 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 193ms 0.4ms 2.0MB 737ms 0ms gcc 15.1.0
c 6-im.c 245ms 0.2ms 2.0MB 937ms 0ms gcc 15.1.0
c 6-im.c 258ms 0.6ms 3.1MB 987ms 0ms clang 14.0.0-1ubuntu1.1
c 4-m.c 261ms 3.1ms 2.0MB 1000ms 0ms gcc 15.1.0
c 4-m.c 287ms 0.9ms 3.3MB 1103ms 0ms clang 14.0.0-1ubuntu1.1
c 5-im.c 293ms 0.6ms 2.0MB 1130ms 0ms gcc 15.1.0
c 5-im.c 340ms 0.6ms 3.3MB 1310ms 0ms clang 14.0.0-1ubuntu1.1
c 3-m.c 463ms 0.0ms 3.3MB 1807ms 0ms clang 14.0.0-1ubuntu1.1
d 1.d 901ms 0.9ms 3.5MB 890ms 0ms ldc2 1.41.0
d 1.d 921ms 9.3ms 5.3MB 910ms 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 58ms 5.3ms 2.0MB 203ms 0ms gcc 15.1.0
c 6-im.c 68ms 0.4ms 2.0MB 243ms 0ms gcc 15.1.0
c 6-im.c 70ms 0.3ms 3.3MB 247ms 0ms clang 14.0.0-1ubuntu1.1
c 4-m.c 72ms 0.6ms 2.1MB 260ms 0ms gcc 15.1.0
c 4-m.c 77ms 0.2ms 3.0MB 280ms 0ms clang 14.0.0-1ubuntu1.1
c 5-im.c 80ms 0.2ms 2.0MB 290ms 0ms gcc 15.1.0
c 5-im.c 92ms 0.5ms 3.3MB 330ms 0ms clang 14.0.0-1ubuntu1.1
c 3-m.c 122ms 0.9ms 3.3MB 450ms 0ms clang 14.0.0-1ubuntu1.1
d 1.d 228ms 1.4ms 3.3MB 220ms 0ms ldc2 1.41.0
d 1.d 233ms 1.9ms 7.2MB 220ms 0ms dmd 2.111.0