Programming Language and compiler
Benchmarks

Swift VS Crystal benchmarks

Current benchmark data was generated on Tue Jul 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
crystal 1.cr 1302ms 4.1ms 64.2MB 1273ms 17ms crystal 1.16.3
swift 1.swift 3027ms 21ms 53.8MB 2990ms 20ms swift 6.1.2

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 109ms 2.8ms 11.0MB 100ms 0ms crystal 1.16.3
swift 1.swift 244ms 5.4ms 11.6MB 230ms 0ms swift 6.1.2

fannkuch-redux

Input: 11

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 1.swift 2463ms 3.1ms 5.4MB 2450ms 0ms swift 6.1.2
crystal 1.cr 2487ms 23ms 2.9MB 2473ms 0ms crystal 1.16.3

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 205ms 3.6ms 2.9MB 197ms 0ms crystal 1.16.3
swift 1.swift 213ms 1.3ms 5.9MB 203ms 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 141ms 1.1ms 20.8MB 400ms 7ms swift 6.1.2
crystal 2.cr 535ms 2.4ms 3.5MB 450ms 70ms crystal 1.16.3
crystal 1.cr 681ms 3.2ms 14.6MB 570ms 97ms crystal 1.16.3

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 3.swift 38ms 0.4ms 14.2MB 30ms 0ms swift 6.1.2
crystal 2.cr 58ms 1.8ms 3.6MB 40ms 7ms crystal 1.16.3
crystal 1.cr 72ms 0.7ms 4.9MB 53ms 7ms crystal 1.16.3

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 2.0ms 0.1ms 2.9MB 0ms 0ms crystal 1.16.3
swift 1.swift 2.6ms 0.1ms 5.6MB 0ms 0ms swift 6.1.2

knucleotide

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 2-m.swift 1599ms 222ms 78.6MB 5027ms 40ms 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 260ms 7.4ms 59.8MB 673ms 30ms swift 6.1.2

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 2.cr 342ms 2.4ms 3.3MB 333ms 0ms crystal 1.16.3
swift 7.swift 350ms 7.2ms 10.3MB 343ms 0ms swift 6.1.2
crystal 1.cr 350ms 6.8ms 3.4MB 343ms 0ms crystal 1.16.3

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 38ms 1.2ms 3.3MB 30ms 0ms crystal 1.16.3
crystal 2.cr 38ms 0.4ms 3.4MB 30ms 0ms crystal 1.16.3
swift 7.swift 39ms 1.1ms 10.0MB 30ms 0ms swift 6.1.2

pidigits

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 1981ms 59ms 6.2MB 1957ms 13ms crystal 1.16.3
swift 1.swift timeout 0.0ms 7.3MB 4927ms 63ms swift 6.1.2

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 456ms 13ms 5.0MB 440ms 0ms crystal 1.16.3
swift 1.swift 1866ms 2.8ms 7.0MB 1850ms 3ms swift 6.1.2