Programming Language and compiler
Benchmarks

Swift VS Rust 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
rust 4.rs 1259ms 3.4ms 33.8MB 1240ms 7ms rustc 1.88.0
rust 5.rs 1337ms 1.1ms 33.8MB 1317ms 10ms rustc 1.88.0
rust 3.rs 1443ms 32ms 49.8MB 1410ms 13ms rustc 1.88.0
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
rust 4.rs 121ms 2.1ms 5.8MB 110ms 0ms rustc 1.88.0
rust 5.rs 126ms 2.0ms 5.8MB 120ms 0ms rustc 1.88.0
rust 3.rs 138ms 4.5ms 7.8MB 127ms 0ms rustc 1.88.0
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
rust 3-im.rs 413ms 0.7ms 2.1MB 1587ms 0ms rustc 1.88.0
rust 5-m.rs 558ms 2.0ms 2.0MB 2130ms 0ms rustc 1.88.0
rust 2-im.rs 667ms 5.0ms 2.1MB 2540ms 0ms rustc 1.88.0
rust 1-m.rs 955ms 4.2ms 2.1MB 3670ms 0ms rustc 1.88.0
rust 3-i.rs 1497ms 2.0ms 1.8MB 1490ms 0ms rustc 1.88.0
rust 2-i.rs 2365ms 0.5ms 1.8MB 2357ms 0ms rustc 1.88.0
swift 1.swift 2469ms 4.7ms 5.4MB 2460ms 0ms swift 6.1.2
rust 1.rs 2700ms 26ms 1.8MB 2690ms 0ms rustc 1.88.0

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 3-im.rs 38ms 0.1ms 2.0MB 127ms 0ms rustc 1.88.0
rust 5-m.rs 52ms 1.3ms 2.1MB 170ms 0ms rustc 1.88.0
rust 2-im.rs 60ms 1.6ms 2.0MB 200ms 0ms rustc 1.88.0
rust 1-m.rs 84ms 0.3ms 2.0MB 290ms 0ms rustc 1.88.0
rust 3-i.rs 125ms 0.6ms 1.9MB 120ms 0ms rustc 1.88.0
rust 2-i.rs 195ms 0.4ms 1.8MB 183ms 0ms rustc 1.88.0
swift 1.swift 213ms 0.4ms 6.1MB 200ms 0ms swift 6.1.2
rust 1.rs 224ms 3.0ms 1.8MB 217ms 0ms rustc 1.88.0

fasta

Input: 2500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 6.rs 88ms 2.0ms 1.9MB 80ms 0ms rustc 1.88.0
rust 5c-m.rs 89ms 0.8ms 3.2MB 250ms 0ms rustc 1.88.0
rust 5-m.rs 92ms 1.4ms 3.2MB 287ms 0ms rustc 1.88.0
swift 3-m.swift 138ms 0.6ms 20.7MB 400ms 3ms swift 6.1.2
rust 1c.rs 164ms 0.4ms 1.9MB 157ms 0ms rustc 1.88.0
rust 1.rs 197ms 1.0ms 1.9MB 190ms 0ms rustc 1.88.0

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 6.rs 11ms 1.0ms 1.9MB 10ms 0ms rustc 1.88.0
rust 5c-m.rs 15ms 0.3ms 3.4MB 23ms 0ms rustc 1.88.0
rust 5-m.rs 16ms 0.7ms 3.4MB 27ms 0ms rustc 1.88.0
rust 1c.rs 19ms 0.5ms 1.9MB 10ms 0ms rustc 1.88.0
rust 1.rs 22ms 0.4ms 1.9MB 10ms 0ms rustc 1.88.0
swift 3.swift 37ms 0.3ms 14.2MB 30ms 0ms swift 6.1.2

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 1.rs 1.2ms 0.1ms 1.8MB 0ms 0ms rustc 1.88.0
rust 1.rs 1.2ms 0.1ms 1.9MB 0ms 0ms rustc 1.90.0-nightly
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
rust 8-m.rs 219ms 11ms 28.1MB 633ms 10ms rustc 1.88.0
rust 8.rs 411ms 1.3ms 23.8MB 390ms 3ms rustc 1.88.0
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
rust 8-m.rs 29ms 2.8ms 15.9MB 60ms 10ms rustc 1.88.0
rust 8.rs 55ms 2.1ms 11.4MB 40ms 0ms rustc 1.88.0
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
rust 4-i.rs 163ms 0.3ms 1.8MB 157ms 0ms rustc 1.88.0
rust 7-i.rs 218ms 1.1ms 1.8MB 210ms 0ms rustc 1.88.0
rust 1.rs 229ms 0.6ms 1.8MB 220ms 0ms rustc 1.88.0
rust 3.rs 279ms 0.5ms 1.9MB 270ms 0ms rustc 1.90.0-nightly
rust 2.rs 279ms 0.3ms 1.6MB 270ms 0ms rustc 1.88.0
swift 7.swift 343ms 0.8ms 9.9MB 330ms 0ms swift 6.1.2

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 4-i.rs 18ms 0.1ms 1.8MB 10ms 0ms rustc 1.88.0
rust 7-i.rs 24ms 0.5ms 1.8MB 20ms 0ms rustc 1.88.0
rust 1.rs 25ms 0.5ms 1.8MB 20ms 0ms rustc 1.88.0
rust 3.rs 30ms 0.1ms 1.9MB 20ms 0ms rustc 1.90.0-nightly
rust 2.rs 30ms 0.1ms 1.6MB 20ms 0ms rustc 1.88.0
swift 7.swift 39ms 0.1ms 9.8MB 30ms 0ms swift 6.1.2

pidigits

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
rust 1.rs 1525ms 5.8ms 2.7MB 1310ms 200ms rustc 1.88.0
rust 2.rs 1707ms 7.2ms 2.7MB 1613ms 77ms rustc 1.88.0
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
rust 1.rs 321ms 2.3ms 2.4MB 300ms 10ms rustc 1.88.0
rust 2.rs 381ms 2.0ms 2.4MB 370ms 0ms rustc 1.88.0
swift 1.swift 1856ms 13ms 7.0MB 1847ms 0ms swift 6.1.2