Programming Language and compiler
Benchmarks

Swift VS Kotlin benchmarks

Current benchmark data was generated on Thu May 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
kotlin 1.kt 492ms 10ms 578.8MB 590ms 93ms kotlin/jvm 21
swift 1.swift 2603ms 10ms 53.8MB 2570ms 20ms swift 6.1.0
kotlin 1.kt 3846ms 34ms 144.1MB 4020ms 77ms kotlin/native 2.1.20

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1.kt 121ms 3.2ms 163.1MB 143ms 33ms kotlin/jvm 21
kotlin 1.kt 204ms 3.4ms 17.6MB 210ms 3ms kotlin/native 2.1.20
swift 1.swift 236ms 1.2ms 11.8MB 220ms 0ms swift 6.1.0

fannkuch-redux

Input: 11

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 1.swift 2477ms 9.7ms 5.5MB 2470ms 0ms swift 6.1.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 1.swift 213ms 1.6ms 5.5MB 203ms 0ms swift 6.1.0

fasta

Input: 2500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 3-m.swift 149ms 1.4ms 20.9MB 430ms 7ms swift 6.1.0

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 3.swift 39ms 0.2ms 14.4MB 40ms 0ms swift 6.1.0

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1.kt 2.2ms 0.2ms 3.1MB 0ms 0ms kotlin/native 2.1.20
swift 1.swift 2.4ms 0.3ms 5.8MB 0ms 0ms swift 6.1.0
kotlin 1-m.kt 61ms 0.9ms 47.6MB 78ms 16ms kotlin/jvm 21

knucleotide

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 2-m.swift 1342ms 9.5ms 74.3MB 4893ms 33ms swift 6.1.0

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 2-m.swift 254ms 1.0ms 59.8MB 660ms 37ms swift 6.1.0

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 7.swift 345ms 0.9ms 10.0MB 337ms 0ms swift 6.1.0
kotlin 1n.kt 350ms 1.7ms 3.5MB 340ms 0ms kotlin/native 2.1.20
kotlin 1.kt 443ms 1.3ms 49.4MB 487ms 13ms kotlin/jvm 21

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 7.swift 38ms 0.6ms 10.1MB 30ms 0ms swift 6.1.0
kotlin 1n.kt 39ms 0.9ms 3.6MB 30ms 0ms kotlin/native 2.1.20
kotlin 1-m.kt 119ms 0.7ms 49.7MB 167ms 20ms kotlin/jvm 21

pidigits

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1.kt 3800ms 74ms 352.9MB 4630ms 117ms kotlin/jvm 21
kotlin 1n.kt timeout 0.0ms 26.3MB 4013ms 1483ms kotlin/native 2.1.20
kotlin 2n.kt timeout 0.0ms 30.8MB 5123ms 127ms kotlin/native 2.1.20
swift 1.swift timeout 0.0ms 7.1MB 4933ms 50ms swift 6.1.0

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1-m.kt 984ms 36ms 353.1MB 1740ms 87ms kotlin/jvm 21
swift 1.swift 1944ms 18ms 7.0MB 1930ms 0ms swift 6.1.0
kotlin 1n.kt timeout 0.0ms 26.6MB 4027ms 1493ms kotlin/native 2.1.20
kotlin 2n.kt timeout 0.0ms 30.9MB 5110ms 130ms kotlin/native 2.1.20