Programming Language and compiler
Benchmarks

Swift VS D 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
swift 1.swift 2661ms 31ms 53.6MB 2630ms 17ms swift 6.1.2
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
swift 1.swift 242ms 3.3ms 11.9MB 230ms 0ms swift 6.1.2
d 1.d 262ms 1.9ms 209.7MB 237ms 10ms 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
swift 1.swift 2469ms 4.7ms 5.4MB 2460ms 0ms swift 6.1.2
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
swift 1.swift 213ms 0.4ms 6.1MB 200ms 0ms swift 6.1.2
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
swift 3-m.swift 138ms 0.6ms 20.7MB 400ms 3ms swift 6.1.2
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
swift 3.swift 37ms 0.3ms 14.2MB 30ms 0ms swift 6.1.2
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
d 1.d 1.6ms 0.1ms 2.9MB 0ms 0ms ldc2 1.41.0
d 1.d 2.0ms 0.2ms 5.1MB 0ms 0ms dmd 2.111.0
swift 1.swift 2.2ms 0.2ms 5.6MB 0ms 0ms swift 6.1.2

knucleotide

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1-m.d 639ms 21ms 47.9MB 2073ms 10ms ldc2 1.41.0
swift 2-m.swift 1313ms 5.4ms 70.6MB 4803ms 27ms swift 6.1.2
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
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
swift 2-m.swift 250ms 2.2ms 60.0MB 663ms 30ms swift 6.1.2

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 7.swift 343ms 0.8ms 9.9MB 330ms 0ms swift 6.1.2
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
d 2.d 39ms 0.7ms 2.9MB 30ms 0ms ldc2 1.41.0
swift 7.swift 39ms 0.1ms 9.8MB 30ms 0ms swift 6.1.2
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

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
swift 1.swift timeout 0.0ms 7.3MB 4930ms 57ms swift 6.1.2

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
swift 1.swift 1856ms 13ms 7.0MB 1847ms 0ms swift 6.1.2