Programming Language and compiler
Benchmarks

Results for 38 of 40 languages from this run on actest1.

Unavailable in this run: Hack, Lisp. Follow the run link for failure details.

Swift VS Python benchmarks

Current benchmark data was generated on Sun Sep 27 2026, full log can be found HERE

CONTRIBUTIONS are WELCOME!

[x86_64][4 cores] Intel(R) Core(TM) i7-3687U CPU @ 2.10GHz (Model 58)

* -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 4602ms 12ms 53.9MB 4573ms 10ms swift 6.1.3
python 1.py 11298ms 16ms 42.2MB 11140ms 137ms cpython 3.12.3

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 1.swift 395ms 8.4ms 11.8MB 373ms 0ms swift 6.1.3
python 1.py 1013ms 82ms 14.0MB 993ms 3ms cpython 3.12.3

fannkuch-redux

Input: 11

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 1.swift 2632ms 45ms 5.7MB 2617ms 0ms swift 6.1.3

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 1.swift 226ms 3.4ms 5.7MB 210ms 0ms swift 6.1.3

fasta

Input: 2500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 3-m.swift 253ms 4.8ms 23.1MB 573ms 13ms swift 6.1.3
python 5-m.py 4266ms 218ms 18.4MB 7193ms 1040ms cpython 3.12.3
python 1.py 6168ms 31ms 10.1MB 6150ms 7ms cpython 3.12.3

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 3.swift 54ms 1.7ms 16.7MB 47ms 3ms swift 6.1.3
python 1.py 648ms 13ms 10.1MB 633ms 3ms cpython 3.12.3
python 5-m.py 719ms 17ms 18.5MB 943ms 193ms cpython 3.12.3

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 1.swift 3.0ms 0.3ms 6.8MB 0ms 0ms swift 6.1.3
python 1.py 24ms 2.6ms 10.2MB 16ms 0ms cpython 3.12.3

knucleotide

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 2-m.swift 2303ms 20ms 75.6MB 8380ms 40ms swift 6.1.3
python 3-m.py 10152ms 192ms 39.2MB 38327ms 140ms cpython 3.12.3

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 2-m.swift 465ms 44ms 60.7MB 1023ms 27ms swift 6.1.3
python 3-m.py 1341ms 2.3ms 19.9MB 4197ms 93ms cpython 3.12.3

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 7.swift 576ms 3.9ms 10.5MB 563ms 0ms swift 6.1.3
python 1.py 39068ms 95ms 10.2MB 39050ms 0ms cpython 3.12.3
python 2.py 41152ms 307ms 11.3MB 41133ms 0ms cpython 3.12.3

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 7.swift 71ms 8.8ms 10.4MB 60ms 0ms swift 6.1.3
python 1.py 3811ms 20ms 10.2MB 3797ms 0ms cpython 3.12.3
python 2.py 4147ms 89ms 10.2MB 4137ms 0ms cpython 3.12.3

pidigits

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
python 4.py 3045ms 90ms 10.4MB 3027ms 3ms cpython 3.12.3
swift 1.swift 12008ms 57ms 8.3MB 11833ms 153ms swift 6.1.3

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
python 4.py 733ms 3.8ms 10.1MB 720ms 0ms cpython 3.12.3
swift 1.swift 2719ms 13ms 8.0MB 2697ms 3ms swift 6.1.3