Programming Language and compiler
Benchmarks

Results for 38 of 40 languages from this run on actest1.

Unavailable in this run: Hack, Lisp. Follow the run link for failure details.

Swift VS C# benchmarks

Current benchmark data was generated on Sun Sep 27 2026, full log can be found HERE

CONTRIBUTIONS are WELCOME!

[x86_64][4 cores] Intel(R) Core(TM) i7-3687U CPU @ 2.10GHz (Model 58)

* -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
csharp 1.cs 1295ms 11ms 187.1MB 1320ms 160ms dotnet 9.0.318
swift 1.swift 4602ms 12ms 53.9MB 4573ms 10ms swift 6.1.3

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 1.cs 287ms 27ms 55.0MB 213ms 33ms dotnet 9.0.318
swift 1.swift 395ms 8.4ms 11.8MB 373ms 0ms swift 6.1.3

fannkuch-redux

Input: 11

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 1.swift 2632ms 45ms 5.7MB 2617ms 0ms swift 6.1.3

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 1.swift 226ms 3.4ms 5.7MB 210ms 0ms swift 6.1.3

fasta

Input: 2500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 5-m.cs 228ms 1.4ms 45.9MB 590ms 100ms dotnet 9.0.318
swift 3-m.swift 253ms 4.8ms 23.1MB 573ms 13ms swift 6.1.3

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 3.swift 54ms 1.7ms 16.7MB 47ms 3ms swift 6.1.3
csharp 5-m.cs 89ms 8.4ms 41.0MB 130ms 10ms dotnet 9.0.318

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 1.swift 3.0ms 0.3ms 6.8MB 0ms 0ms swift 6.1.3
csharp 1.cs 46ms 3.5ms 24.6MB 30ms 2ms dotnet 9.0.318

knucleotide

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 6-m.cs 1157ms 42ms 72.1MB 2957ms 37ms dotnet 9.0.318
swift 2-m.swift 2303ms 20ms 75.6MB 8380ms 40ms swift 6.1.3

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 6-m.cs 289ms 10ms 58.9MB 450ms 33ms dotnet 9.0.318
swift 2-m.swift 465ms 44ms 60.7MB 1023ms 27ms swift 6.1.3

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 7.swift 576ms 3.9ms 10.5MB 563ms 0ms swift 6.1.3
csharp 8.cs 783ms 1.5ms 29.6MB 760ms 10ms dotnet 9.0.318
csharp 9.cs 997ms 4.7ms 29.6MB 967ms 17ms dotnet 9.0.318

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 7.swift 71ms 8.8ms 10.4MB 60ms 0ms swift 6.1.3
csharp 8.cs 159ms 7.2ms 30.1MB 140ms 3ms dotnet 9.0.318
csharp 9.cs 228ms 3.1ms 29.9MB 203ms 10ms dotnet 9.0.318

pidigits

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 1.cs 4990ms 415ms 40.2MB 4877ms 317ms dotnet 9.0.318
swift 1.swift 12008ms 57ms 8.3MB 11833ms 153ms swift 6.1.3

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 1.cs 1338ms 83ms 39.5MB 1447ms 73ms dotnet 9.0.318
swift 1.swift 2719ms 13ms 8.0MB 2697ms 3ms swift 6.1.3