Programming Language and compiler
Benchmarks

Swift VS D benchmarks

Current benchmark data was generated on Sun Jun 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 1768ms 21ms 312.6MB 1733ms 40ms ldc2 1.40.1
swift 1.swift 2555ms 26ms 53.8MB 2523ms 20ms swift 6.1.2
d 1.d 3074ms 138ms 314.1MB 3237ms 53ms dmd 2.111.0

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 166ms 2.1ms 207.9MB 140ms 17ms ldc2 1.40.1
swift 1.swift 232ms 3.0ms 11.9MB 220ms 0ms swift 6.1.2
d 1.d 262ms 3.0ms 211.1MB 233ms 20ms 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 389ms 21ms 3.0MB 1423ms 0ms ldc2 1.40.1
d 2-im.d 1118ms 4.1ms 3.0MB 4323ms 0ms ldc2 1.40.1
d 1-i.d 1486ms 5.4ms 2.9MB 1473ms 0ms ldc2 1.40.1
swift 1.swift 2480ms 2.8ms 5.5MB 2470ms 0ms swift 6.1.2
d 1.d 3121ms 27ms 2.8MB 3110ms 0ms ldc2 1.40.1
d 2-i.d 3238ms 0.8ms 2.9MB 3230ms 0ms ldc2 1.40.1
d 1.d 3537ms 4.6ms 4.6MB 3527ms 0ms dmd 2.111.0
d 1-im.d 4471ms 28ms 4.9MB 17507ms 0ms dmd 2.111.0
d 1-i.d timeout 0.0ms 4.5MB 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 19737ms 13ms dmd 2.111.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1-im.d 37ms 0.6ms 3.0MB 110ms 0ms ldc2 1.40.1
d 2-im.d 97ms 1.6ms 3.0MB 347ms 0ms ldc2 1.40.1
d 1-i.d 123ms 0.5ms 2.9MB 110ms 0ms ldc2 1.40.1
swift 1.swift 214ms 2.6ms 5.5MB 207ms 0ms swift 6.1.2
d 1.d 263ms 1.6ms 2.9MB 250ms 0ms ldc2 1.40.1
d 2-i.d 268ms 1.3ms 2.9MB 260ms 0ms ldc2 1.40.1
d 1.d 297ms 1.3ms 4.6MB 290ms 0ms dmd 2.111.0
d 1-im.d 383ms 15ms 4.9MB 1427ms 0ms dmd 2.111.0
d 2-im.d 520ms 1.5ms 4.9MB 2007ms 0ms dmd 2.111.0
d 1-i.d 891ms 4.6ms 4.6MB 883ms 0ms dmd 2.111.0
d 2-i.d 1382ms 12ms 4.5MB 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 1.6ms 21.0MB 433ms 3ms swift 6.1.2
d 1.d 156ms 2.4ms 2.9MB 147ms 0ms ldc2 1.40.1
d 1.d 647ms 7.8ms 4.8MB 633ms 0ms dmd 2.111.0

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 18ms 0.7ms 2.9MB 10ms 0ms ldc2 1.40.1
swift 3.swift 38ms 0.4ms 14.4MB 33ms 0ms swift 6.1.2
d 1.d 67ms 0.5ms 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 3.0MB 0ms 0ms ldc2 1.40.1
d 1.d 2.0ms 0.2ms 5.1MB 0ms 0ms dmd 2.111.0
swift 1.swift 2.4ms 0.2ms 5.9MB 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 622ms 16ms 47.8MB 2043ms 10ms ldc2 1.40.1
swift 2-m.swift 1326ms 10ms 74.3MB 4847ms 33ms swift 6.1.2
d 1-m.d 1876ms 46ms 58.6MB 5530ms 10ms 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 86ms 1.1ms 38.8MB 243ms 13ms ldc2 1.40.1
d 1-m.d 227ms 31ms 40.9MB 607ms 67ms dmd 2.111.0
swift 2-m.swift 249ms 1.6ms 60.1MB 660ms 27ms 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 1.2ms 10.1MB 333ms 0ms swift 6.1.2
d 1.d 360ms 0.7ms 2.9MB 350ms 0ms ldc2 1.40.1
d 2.d 361ms 1.1ms 2.9MB 350ms 0ms ldc2 1.40.1
d 1.d 678ms 10ms 4.8MB 670ms 0ms dmd 2.111.0
d 2.d 2037ms 13ms 4.6MB 2027ms 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 0.3ms 2.9MB 30ms 0ms ldc2 1.40.1
d 2.d 39ms 0.4ms 2.9MB 30ms 0ms ldc2 1.40.1
swift 7.swift 39ms 1.3ms 10.3MB 30ms 0ms swift 6.1.2
d 1.d 71ms 1.0ms 4.8MB 60ms 0ms dmd 2.111.0
d 2.d 210ms 0.8ms 4.6MB 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 2422ms 6.5ms 7.9MB 2373ms 427ms ldc2 1.40.1
d 1.d 4459ms 11ms 10.5MB 4440ms 447ms dmd 2.111.0
swift 1.swift timeout 0.0ms 7.1MB 4920ms 67ms swift 6.1.2

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
d 1.d 586ms 9.4ms 8.0MB 563ms 93ms ldc2 1.40.1
d 1.d 1055ms 1.4ms 10.4MB 1050ms 97ms dmd 2.111.0
swift 1.swift 1831ms 3.2ms 7.0MB 1813ms 0ms swift 6.1.2