Programming Language and compiler
Benchmarks

Swift VS Ruby benchmarks

Current benchmark data was generated on Sun Jul 13 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
swift 1.swift 2692ms 22ms 53.8MB 2657ms 20ms swift 6.1.2
ruby 1.rb 4770ms 133ms 110.1MB 4677ms 77ms ruby/yjit 3.4.4
ruby 1.rb timeout 0.0ms 70.5MB 4950ms 33ms ruby 3.4.4
ruby 1.rb timeout 0.0ms 796.7MB 6620ms 720ms truffleruby 24.2.1

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 1.swift 240ms 0.7ms 11.9MB 230ms 0ms swift 6.1.2
ruby 1.rb 498ms 0.9ms 20.3MB 473ms 10ms ruby/yjit 3.4.4
ruby 1-m.rb 503ms 8.2ms 407.1MB 980ms 150ms truffleruby 24.2.1
ruby 1.rb 947ms 3.2ms 19.5MB 923ms 13ms ruby 3.4.4

fannkuch-redux

Input: 11

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 1.swift 2463ms 7.5ms 5.5MB 2453ms 0ms swift 6.1.2

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 1.swift 213ms 2.3ms 5.5MB 200ms 0ms swift 6.1.2

fasta

Input: 2500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 3-m.swift 139ms 1.6ms 20.7MB 400ms 3ms swift 6.1.2
ruby 6.rb 2046ms 3.0ms 23.0MB 2023ms 10ms ruby/yjit 3.4.4
ruby 6-m.rb 2107ms 209ms 406.5MB 5403ms 323ms truffleruby 24.2.1
ruby 6.rb 3692ms 15ms 22.4MB 3673ms 10ms ruby 3.4.4

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 3.swift 37ms 0.3ms 14.2MB 30ms 0ms swift 6.1.2
ruby 6.rb 259ms 4.3ms 15.2MB 237ms 10ms ruby/yjit 3.4.4
ruby 6.rb 415ms 1.8ms 14.4MB 397ms 3ms ruby 3.4.4
ruby 6-m.rb 843ms 29ms 380.9MB 2103ms 163ms truffleruby 24.2.1

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 1.swift 2.4ms 0.1ms 5.6MB 0ms 0ms swift 6.1.2
ruby 1.rb 34ms 0.4ms 141.1MB 12ms 24ms truffleruby 24.2.1
ruby 1.rb 51ms 1.1ms 12.8MB 38ms 0ms ruby 3.4.4
ruby 1.rb 53ms 0.4ms 12.9MB 38ms 4ms ruby/yjit 3.4.4

knucleotide

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 2-m.swift 1361ms 16ms 74.3MB 4960ms 37ms swift 6.1.2

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 2-m.swift 251ms 2.0ms 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 346ms 2.1ms 9.9MB 337ms 0ms swift 6.1.2
ruby 2.rb 836ms 14ms 325.0MB 1103ms 117ms truffleruby 24.2.1
ruby 2.rb timeout 0.0ms 12.8MB 4983ms 3ms ruby 3.4.4
ruby 2.rb timeout 0.0ms 13.5MB 4977ms 10ms ruby/yjit 3.4.4

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 7.swift 39ms 0.9ms 9.9MB 30ms 0ms swift 6.1.2
ruby 2-m.rb 309ms 6.6ms 309.6MB 560ms 103ms truffleruby 24.2.1
ruby 2.rb 1028ms 6.1ms 13.5MB 1010ms 3ms ruby/yjit 3.4.4
ruby 2.rb 2980ms 14ms 12.8MB 2963ms 7ms ruby 3.4.4

pidigits

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ruby 1.rb timeout 0.0ms 130.2MB 4863ms 123ms ruby 3.4.4
ruby 1.rb timeout 0.0ms 131.0MB 4833ms 150ms ruby/yjit 3.4.4
ruby 1.rb timeout 0.0ms 450.5MB 13320ms 430ms truffleruby 24.2.1
swift 1.swift timeout 0.0ms 7.3MB 4927ms 60ms swift 6.1.2

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
ruby 1-m.rb 1668ms 200ms 395.7MB 4403ms 210ms truffleruby 24.2.1
ruby 1.rb 1766ms 80ms 130.9MB 1657ms 93ms ruby/yjit 3.4.4
ruby 1.rb 1816ms 25ms 130.3MB 1690ms 113ms ruby 3.4.4
swift 1.swift 1865ms 11ms 7.0MB 1853ms 0ms swift 6.1.2