Programming Language and compiler
Benchmarks

Swift VS Zig benchmarks

Current benchmark data was generated on Mon Jun 23 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
zig 1.zig 1880ms 29ms 49.0MB 1853ms 13ms zig 0.14.1
swift 1.swift 2879ms 30ms 53.8MB 2850ms 17ms swift 6.1.2

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
zig 1.zig 152ms 0.9ms 7.0MB 140ms 0ms zig 0.14.1
swift 1.swift 243ms 4.6ms 11.8MB 233ms 0ms swift 6.1.2

fannkuch-redux

Input: 11

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
zig 2-m.zig 637ms 2.3ms 1.4MB 2397ms 0ms zig 0.14.1
zig 3-i.zig 1766ms 1.5ms 1.0MB 1760ms 0ms zig 0.14.1
swift 1.swift 2470ms 11ms 5.4MB 2460ms 0ms swift 6.1.2
zig 1.zig 2723ms 11ms 1.0MB 2713ms 0ms zig 0.14.1

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
zig 2-m.zig 61ms 0.4ms 1.4MB 200ms 0ms zig 0.14.1
zig 3-i.zig 147ms 0.1ms 1.0MB 140ms 0ms zig 0.14.1
swift 1.swift 213ms 1.9ms 6.4MB 203ms 0ms swift 6.1.2
zig 1.zig 229ms 0.5ms 1.0MB 220ms 0ms zig 0.14.1

fasta

Input: 2500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
zig 1.zig 88ms 1.0ms 1.0MB 80ms 0ms zig 0.14.1
swift 3-m.swift 140ms 1.8ms 20.7MB 400ms 3ms swift 6.1.2

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
zig 1.zig 10ms 0.0ms 1.0MB 0ms 0ms zig 0.14.1
swift 3.swift 38ms 0.4ms 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
zig 1.zig 0.9ms 0.0ms 1.1MB 0ms 0ms zig 0.14.1
swift 1.swift 2.2ms 0.2ms 5.9MB 0ms 0ms swift 6.1.2

knucleotide

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
zig 1-m.zig 348ms 15ms 67.1MB 953ms 30ms zig 0.14.1
zig 1.zig 509ms 2.9ms 27.4MB 487ms 10ms zig 0.14.1
swift 2-m.swift 1336ms 7.8ms 74.5MB 4920ms 33ms swift 6.1.2

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
zig 1.zig 67ms 1.9ms 15.4MB 50ms 7ms zig 0.14.1
zig 1-m.zig 70ms 2.7ms 54.3MB 147ms 33ms zig 0.14.1
swift 2-m.swift 254ms 1.1ms 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
zig 3.zig 198ms 0.3ms 1.0MB 190ms 0ms zig 0.14.1
zig 2.zig 281ms 1.9ms 1.0MB 270ms 0ms zig 0.14.1
zig 1.zig 317ms 0.8ms 1.1MB 310ms 0ms zig 0.14.1
swift 7.swift 345ms 2.1ms 10.3MB 337ms 0ms swift 6.1.2

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
zig 3.zig 22ms 0.6ms 1.3MB 13ms 0ms zig 0.14.1
zig 2.zig 30ms 0.1ms 1.0MB 20ms 0ms zig 0.14.1
zig 1.zig 33ms 0.1ms 1.1MB 27ms 0ms zig 0.14.1
swift 7.swift 39ms 1.0ms 10.1MB 30ms 0ms swift 6.1.2

pidigits

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
zig 1.zig 2452ms 13ms 2.2MB 2420ms 13ms zig 0.14.1
swift 1.swift timeout 0.0ms 7.1MB 4937ms 50ms swift 6.1.2

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
zig 1.zig 565ms 2.4ms 1.8MB 553ms 0ms zig 0.14.1
swift 1.swift 1867ms 6.8ms 7.1MB 1853ms 0ms swift 6.1.2