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 Crystal 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
crystal 1.cr 2516ms 29ms 57.1MB 2487ms 10ms crystal 1.11.2
swift 1.swift 4602ms 12ms 53.9MB 4573ms 10ms swift 6.1.3

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 223ms 20ms 9.5MB 207ms 0ms crystal 1.11.2
swift 1.swift 395ms 8.4ms 11.8MB 373ms 0ms swift 6.1.3

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
crystal 1.cr 3642ms 13ms 2.5MB 3633ms 0ms crystal 1.11.2

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
crystal 1.cr 295ms 1.0ms 2.5MB 280ms 0ms crystal 1.11.2

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
crystal 2.cr 622ms 5.2ms 2.9MB 493ms 110ms crystal 1.11.2
crystal 1.cr 864ms 8.7ms 14.1MB 743ms 100ms crystal 1.11.2

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
crystal 2.cr 78ms 5.8ms 2.9MB 57ms 10ms crystal 1.11.2
crystal 1.cr 94ms 2.3ms 4.0MB 70ms 7ms crystal 1.11.2

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 2.8ms 0.5ms 2.5MB 0ms 0ms crystal 1.11.2
swift 1.swift 3.0ms 0.3ms 6.8MB 0ms 0ms swift 6.1.3

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

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

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
crystal 2.cr 632ms 1.1ms 3.0MB 620ms 0ms crystal 1.11.2
crystal 1.cr 636ms 6.6ms 3.0MB 623ms 0ms crystal 1.11.2

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 2.cr 68ms 0.7ms 3.0MB 57ms 0ms crystal 1.11.2
crystal 1.cr 68ms 2.8ms 3.0MB 60ms 0ms crystal 1.11.2
swift 7.swift 71ms 8.8ms 10.4MB 60ms 0ms swift 6.1.3

pidigits

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 3508ms 129ms 5.6MB 3480ms 10ms crystal 1.11.2
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
crystal 1.cr 831ms 12ms 4.3MB 807ms 3ms crystal 1.11.2
swift 1.swift 2719ms 13ms 8.0MB 2697ms 3ms swift 6.1.3