Programming Language and compiler
Benchmarks

Swift VS Crystal benchmarks

Current benchmark data was generated on Fri Aug 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 1231ms 8.3ms 64.2MB 1203ms 10ms crystal 1.17.0
swift 1.swift 2661ms 31ms 53.6MB 2630ms 17ms swift 6.1.2

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 104ms 1.6ms 11.0MB 90ms 0ms crystal 1.17.0
swift 1.swift 242ms 3.3ms 11.9MB 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 2469ms 4.7ms 5.4MB 2460ms 0ms swift 6.1.2
crystal 1.cr 2510ms 4.1ms 2.9MB 2497ms 0ms crystal 1.17.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 207ms 2.7ms 2.9MB 200ms 0ms crystal 1.17.0
swift 1.swift 213ms 0.4ms 6.1MB 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 138ms 0.6ms 20.7MB 400ms 3ms swift 6.1.2
crystal 2.cr 540ms 2.0ms 3.6MB 450ms 77ms crystal 1.17.0
crystal 1.cr 681ms 2.0ms 14.6MB 570ms 97ms crystal 1.17.0

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
crystal 2.cr 57ms 0.8ms 3.6MB 40ms 0ms crystal 1.17.0
crystal 1.cr 72ms 0.8ms 4.4MB 53ms 7ms crystal 1.17.0

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 1.9ms 0.1ms 2.9MB 0ms 0ms crystal 1.17.0
swift 1.swift 2.2ms 0.2ms 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 1313ms 5.4ms 70.6MB 4803ms 27ms 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 250ms 2.2ms 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 343ms 0.8ms 9.9MB 330ms 0ms swift 6.1.2
crystal 2.cr 345ms 2.9ms 3.4MB 337ms 0ms crystal 1.17.0
crystal 1.cr 346ms 3.1ms 3.4MB 337ms 0ms crystal 1.17.0

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 2.cr 37ms 0.5ms 3.4MB 30ms 0ms crystal 1.17.0
swift 7.swift 39ms 0.1ms 9.8MB 30ms 0ms swift 6.1.2
crystal 1.cr 39ms 0.1ms 3.4MB 30ms 0ms crystal 1.17.0

pidigits

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 1960ms 30ms 6.3MB 1927ms 17ms crystal 1.17.0
swift 1.swift timeout 0.0ms 7.3MB 4930ms 57ms swift 6.1.2

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
crystal 1.cr 438ms 11ms 5.0MB 430ms 0ms crystal 1.17.0
swift 1.swift 1856ms 13ms 7.0MB 1847ms 0ms swift 6.1.2