Programming Language and compiler
Benchmarks

Swift VS D benchmarks

Current benchmark data was generated on Mon Apr 14 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 1781ms 9.7ms 312.7MB 1753ms 37ms ldc2 1.40.1
swift 1.swift 2675ms 16ms 53.8MB 2643ms 20ms swift 6.1.0
d 1.d 3029ms 5.2ms 314.9MB 3207ms 50ms dmd 2.111.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 162ms 2.9ms 209.9MB 137ms 13ms ldc2 1.40.1
swift 1.swift 239ms 3.9ms 11.8MB 227ms 0ms swift 6.1.0
d 1.d 261ms 2.3ms 212.1MB 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 375ms 7.3ms 3.0MB 1420ms 0ms ldc2 1.40.1
d 2-im.d 1128ms 21ms 2.9MB 4313ms 0ms ldc2 1.40.1
d 1-i.d 1484ms 0.3ms 2.8MB 1470ms 0ms ldc2 1.40.1
swift 1.swift 2491ms 11ms 5.5MB 2480ms 0ms swift 6.1.0
d 1.d 3120ms 15ms 2.9MB 3110ms 0ms ldc2 1.40.1
d 2-i.d 3240ms 3.2ms 2.9MB 3230ms 0ms ldc2 1.40.1
d 1.d 3532ms 4.1ms 4.6MB 3523ms 0ms dmd 2.111.0
d 1-im.d 4474ms 19ms 4.9MB 17573ms 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 4.5MB 4990ms 0ms dmd 2.111.0
d 2-im.d timeout 0.0ms 4.9MB 19740ms 3ms dmd 2.111.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1-im.d 38ms 0.5ms 3.0MB 110ms 0ms ldc2 1.40.1
d 2-im.d 99ms 2.1ms 2.9MB 350ms 0ms ldc2 1.40.1
d 1-i.d 124ms 0.3ms 2.9MB 117ms 0ms ldc2 1.40.1
swift 1.swift 213ms 3.7ms 6.3MB 203ms 0ms swift 6.1.0
d 1.d 262ms 1.9ms 2.9MB 253ms 0ms ldc2 1.40.1
d 2-i.d 268ms 0.7ms 2.9MB 260ms 0ms ldc2 1.40.1
d 1.d 295ms 1.1ms 4.6MB 287ms 0ms dmd 2.111.0
d 1-im.d 375ms 3.7ms 4.8MB 1433ms 0ms dmd 2.111.0
d 2-im.d 528ms 7.3ms 4.9MB 2010ms 0ms dmd 2.111.0
d 1-i.d 893ms 3.1ms 4.5MB 883ms 0ms dmd 2.111.0
d 2-i.d 1384ms 18ms 4.6MB 1373ms 0ms dmd 2.111.0

fasta

Input: 2500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 3-m.swift 146ms 0.8ms 20.8MB 433ms 0ms swift 6.1.0
d 1.d 156ms 2.3ms 2.9MB 147ms 0ms ldc2 1.40.1
d 1.d 640ms 0.8ms 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 19ms 0.4ms 3.0MB 10ms 0ms ldc2 1.40.1
swift 3.swift 38ms 0.4ms 18.2MB 37ms 0ms swift 6.1.0
d 1.d 68ms 1.3ms 4.9MB 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 1.40.1
d 1.d 2.1ms 0.2ms 5.0MB 0ms 0ms dmd 2.111.0
swift 1.swift 2.3ms 0.2ms 5.8MB 0ms 0ms swift 6.1.0

knucleotide

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1-m.d 653ms 20ms 47.2MB 2180ms 13ms ldc2 1.40.1
swift 2-m.swift 1336ms 17ms 70.7MB 4880ms 30ms swift 6.1.0
d 1-m.d 1844ms 52ms 49.5MB 5630ms 17ms 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 90ms 7.2ms 39.9MB 250ms 10ms ldc2 1.40.1
d 1-m.d 211ms 8.5ms 40.0MB 597ms 10ms dmd 2.111.0
swift 2-m.swift 248ms 2.1ms 60.0MB 663ms 23ms swift 6.1.0

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 7.swift 344ms 2.0ms 10.0MB 330ms 0ms swift 6.1.0
d 2.d 361ms 0.8ms 2.9MB 350ms 0ms ldc2 1.40.1
d 1.d 362ms 1.7ms 2.9MB 350ms 0ms ldc2 1.40.1
d 1.d 689ms 3.9ms 4.6MB 680ms 0ms dmd 2.111.0
d 2.d 2028ms 2.4ms 4.8MB 2020ms 0ms dmd 2.111.0

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 39ms 0.4ms 2.9MB 30ms 0ms ldc2 1.40.1
swift 7.swift 39ms 0.2ms 10.0MB 30ms 0ms swift 6.1.0
d 2.d 39ms 0.5ms 2.9MB 30ms 0ms ldc2 1.40.1
d 1.d 71ms 0.7ms 4.6MB 60ms 0ms dmd 2.111.0
d 2.d 207ms 2.0ms 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 2442ms 0.9ms 8.1MB 2387ms 437ms ldc2 1.40.1
d 1.d 4423ms 16ms 10.5MB 4377ms 467ms dmd 2.111.0
swift 1.swift timeout 0.0ms 7.1MB 4937ms 50ms swift 6.1.0

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 586ms 1.5ms 8.0MB 577ms 93ms ldc2 1.40.1
d 1.d 1052ms 4.2ms 10.4MB 1030ms 117ms dmd 2.111.0
swift 1.swift 1928ms 4.2ms 7.0MB 1913ms 0ms swift 6.1.0