Programming Language and compiler
Benchmarks

Swift VS Python 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
python 1.py 1162ms 7.5ms 96.8MB 1097ms 47ms pypy 3.11.13
swift 1.swift 2692ms 22ms 53.8MB 2657ms 20ms swift 6.1.2
python 1.py timeout 0.0ms 41.0MB 4973ms 10ms cpython 3.13.5
python 1.py timeout 0.0ms 40.5MB 4743ms 240ms pyston 3.8.12

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
python 1.py 94ms 1.5ms 68.2MB 67ms 13ms pypy 3.11.13
swift 1.swift 240ms 0.7ms 11.9MB 230ms 0ms swift 6.1.2
python 1.py 478ms 3.6ms 11.9MB 457ms 10ms pyston 3.8.12
python 1.py 727ms 3.3ms 12.9MB 717ms 0ms cpython 3.13.5

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
python 1.py 2206ms 28ms 89.1MB 2163ms 33ms pypy 3.11.13
python 5-m.py 2331ms 44ms 66.1MB 3597ms 827ms pypy 3.11.13
python 5-m.py 2434ms 24ms 12.5MB 3547ms 953ms pyston 3.8.12
python 1.py 3030ms 35ms 8.1MB 3013ms 0ms pyston 3.8.12
python 5-m.py 3359ms 19ms 13.8MB 4437ms 910ms cpython 3.13.5
python 1.py 4658ms 45ms 9.0MB 4647ms 0ms cpython 3.13.5

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
python 1.py 279ms 5.1ms 63.3MB 253ms 10ms pypy 3.11.13
python 5-m.py 310ms 3.6ms 12.5MB 397ms 147ms pyston 3.8.12
python 1.py 314ms 1.1ms 8.1MB 300ms 0ms pyston 3.8.12
python 5-m.py 393ms 1.0ms 13.8MB 473ms 127ms cpython 3.13.5
python 5-m.py 449ms 2.7ms 66.2MB 743ms 297ms pypy 3.11.13
python 1.py 486ms 1.2ms 9.0MB 473ms 0ms cpython 3.13.5

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
python 1.py 12ms 0.8ms 7.6MB 0ms 0ms pyston 3.8.12
python 1.py 14ms 1.2ms 8.8MB 10ms 0ms cpython 3.13.5
python 1.py 30ms 0.8ms 52.3MB 10ms 10ms pypy 3.11.13

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
python 3-m.py 2341ms 4.1ms 136.0MB 7903ms 333ms pypy 3.11.13
python 3-m.py 3129ms 44ms 34.2MB 11863ms 123ms pyston 3.8.12
python 3.py timeout 0.0ms 35.8MB 90ms 20ms cpython 3.13.5

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
python 3-m.py 390ms 0.6ms 76.7MB 980ms 150ms pypy 3.11.13
python 3-m.py 395ms 4.5ms 14.3MB 1297ms 80ms pyston 3.8.12
python 3-m.py 660ms 11ms 15.2MB 2320ms 67ms cpython 3.13.5

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
python 2.py 1348ms 4.2ms 60.6MB 1320ms 10ms pypy 3.11.13
python 1.py 2705ms 69ms 57.8MB 2677ms 13ms pypy 3.11.13
python 1.py timeout 0.0ms 8.9MB 4990ms 0ms cpython 3.13.5
python 2.py timeout 0.0ms 9.0MB 4990ms 0ms cpython 3.13.5
python 1.py timeout 0.0ms 8.3MB 4990ms 0ms pyston 3.8.12
python 2.py timeout 0.0ms 8.1MB 4990ms 0ms pyston 3.8.12

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
python 2.py 178ms 3.3ms 58.3MB 153ms 10ms pypy 3.11.13
python 1.py 309ms 4.0ms 57.8MB 287ms 10ms pypy 3.11.13
python 1.py 936ms 11ms 8.3MB 927ms 0ms pyston 3.8.12
python 2.py 1312ms 18ms 8.3MB 1300ms 0ms pyston 3.8.12
python 1.py 2893ms 26ms 8.9MB 2883ms 0ms cpython 3.13.5
python 2.py 3043ms 14ms 9.0MB 3030ms 0ms cpython 3.13.5

pidigits

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
python 4.py 1921ms 13ms 8.9MB 1873ms 33ms pyston 3.8.12
python 4.py 1974ms 0.7ms 9.5MB 1920ms 40ms cpython 3.13.5
python 4.py 2156ms 3.3ms 89.6MB 2117ms 27ms pypy 3.11.13
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
python 4.py 454ms 1.7ms 8.6MB 440ms 0ms pyston 3.8.12
python 4.py 470ms 3.8ms 9.4MB 457ms 0ms cpython 3.13.5
python 4.py 541ms 4.5ms 83.8MB 503ms 23ms pypy 3.11.13
swift 1.swift 1865ms 11ms 7.0MB 1853ms 0ms swift 6.1.2