Programming Language and compiler
Benchmarks

Swift VS Zig benchmarks

Current benchmark data was generated on Sun Jun 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
zig 1.zig 1718ms 14ms 49.0MB 1683ms 20ms zig 0.14.1
swift 1.swift 2555ms 26ms 53.8MB 2523ms 20ms swift 6.1.2

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
zig 1.zig 150ms 2.1ms 7.0MB 140ms 0ms zig 0.14.1
swift 1.swift 232ms 3.0ms 11.9MB 220ms 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 638ms 2.2ms 1.4MB 2400ms 0ms zig 0.14.1
zig 3-i.zig 1764ms 0.6ms 1.0MB 1753ms 0ms zig 0.14.1
swift 1.swift 2480ms 2.8ms 5.5MB 2470ms 0ms swift 6.1.2
zig 1.zig 2716ms 5.8ms 1.0MB 2707ms 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 60ms 0.3ms 1.4MB 200ms 0ms zig 0.14.1
zig 3-i.zig 147ms 0.4ms 1.0MB 140ms 0ms zig 0.14.1
swift 1.swift 214ms 2.6ms 5.5MB 207ms 0ms swift 6.1.2
zig 1.zig 229ms 0.8ms 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 87ms 1.4ms 1.0MB 80ms 0ms zig 0.14.1
swift 3-m.swift 146ms 1.6ms 21.0MB 433ms 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 0.1ms 1.0MB 0ms 0ms zig 0.14.1
swift 3.swift 38ms 0.4ms 14.4MB 33ms 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 1.1ms 0.4ms 1.1MB 0ms 0ms zig 0.14.1
swift 1.swift 2.4ms 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 314ms 1.1ms 66.5MB 827ms 30ms zig 0.14.1
zig 1.zig 500ms 5.4ms 28.0MB 483ms 7ms zig 0.14.1
swift 2-m.swift 1326ms 10ms 74.3MB 4847ms 33ms swift 6.1.2

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
zig 1-m.zig 63ms 0.5ms 54.3MB 123ms 33ms zig 0.14.1
zig 1.zig 66ms 1.0ms 15.5MB 50ms 0ms zig 0.14.1
swift 2-m.swift 249ms 1.6ms 60.1MB 660ms 27ms 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 1.0ms 1.0MB 190ms 0ms zig 0.14.1
zig 2.zig 279ms 0.5ms 1.0MB 270ms 0ms zig 0.14.1
zig 1.zig 315ms 0.7ms 1.1MB 310ms 0ms zig 0.14.1
swift 7.swift 343ms 1.2ms 10.1MB 333ms 0ms swift 6.1.2

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
zig 3.zig 21ms 0.2ms 1.0MB 10ms 0ms zig 0.14.1
zig 2.zig 30ms 0.1ms 1.0MB 20ms 0ms zig 0.14.1
zig 1.zig 34ms 0.6ms 1.1MB 30ms 0ms zig 0.14.1
swift 7.swift 39ms 1.3ms 10.3MB 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 2458ms 11ms 2.3MB 2430ms 17ms zig 0.14.1
swift 1.swift timeout 0.0ms 7.1MB 4920ms 67ms swift 6.1.2

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
zig 1.zig 565ms 4.7ms 1.8MB 553ms 0ms zig 0.14.1
swift 1.swift 1831ms 3.2ms 7.0MB 1813ms 0ms swift 6.1.2