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.

Kotlin 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
kotlin 1.kt 794ms 80ms 581.9MB 1017ms 130ms kotlin/jvm 21.0.12
csharp 1.cs 1295ms 11ms 187.1MB 1320ms 160ms dotnet 9.0.318

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1.kt 188ms 30ms 159.7MB 233ms 30ms kotlin/jvm 21.0.12
csharp 1.cs 287ms 27ms 55.0MB 213ms 33ms dotnet 9.0.318

coro-prime-sieve

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 2-m.kt 3342ms 283ms 229.6MB 12590ms 123ms kotlin/jvm 21.0.12
csharp 1-m.cs 3524ms 240ms 77.2MB 12327ms 143ms dotnet 9.0.318
kotlin 1.kt 3615ms 290ms 219.6MB 4723ms 107ms kotlin/jvm 21.0.12

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 1-m.cs 433ms 30ms 41.3MB 1257ms 27ms dotnet 9.0.318
kotlin 1-m.kt 738ms 7.2ms 77.4MB 1727ms 47ms kotlin/jvm 21.0.12
kotlin 2-m.kt 1625ms 206ms 97.5MB 5807ms 100ms kotlin/jvm 21.0.12

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 1.cs 46ms 3.5ms 24.6MB 30ms 2ms dotnet 9.0.318
kotlin 1-m.kt 87ms 4.3ms 46.2MB 136ms 12ms kotlin/jvm 21.0.12

http-server

Input: 3000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 2-http2.cs 821ms 13ms 108.9MB 1357ms 167ms dotnet 9.0.318
csharp 2-m.cs 1078ms 79ms 166.0MB 1467ms 757ms dotnet 9.0.318
csharp 1-m.cs 1153ms 50ms 167.4MB 1897ms 800ms dotnet 9.0.318
csharp 2-http3.cs 1186ms 29ms 170.6MB 2087ms 340ms dotnet 9.0.318
kotlin 2-m.kt 9841ms 283ms 341.7MB 32387ms 3343ms kotlin/jvm 21.0.12
kotlin 1-m.kt 11376ms 242ms 433.1MB 37790ms 4520ms kotlin/jvm 21.0.12

Input: 500

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 2.cs 608ms 17ms 87.8MB 637ms 177ms dotnet 9.0.318
csharp 1-m.cs 656ms 17ms 100.2MB 873ms 230ms dotnet 9.0.318
csharp 2-http2.cs 679ms 17ms 90.2MB 780ms 113ms dotnet 9.0.318
csharp 2-http3.cs 868ms 13ms 100.2MB 1010ms 147ms dotnet 9.0.318
kotlin 2-m.kt 3791ms 276ms 249.0MB 11797ms 810ms kotlin/jvm 21.0.12
kotlin 1-m.kt 3917ms 180ms 275.4MB 12153ms 857ms kotlin/jvm 21.0.12

json-serde

Input: sample 5000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 2.cs 503ms 28ms 73.7MB 480ms 30ms dotnet 9.0.318
csharp 1.cs 1142ms 104ms 145.0MB 1297ms 93ms dotnet 9.0.318
kotlin 1-m.kt 1371ms 105ms 176.1MB 3830ms 140ms kotlin/jvm 21.0.12

Input: canada 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 2.cs 2313ms 114ms 247.2MB 2667ms 93ms dotnet 9.0.318
kotlin 1-m.kt 3079ms 117ms 749.4MB 7240ms 250ms kotlin/jvm 21.0.12
csharp 1-m.cs 3652ms 36ms 762.3MB 5157ms 397ms dotnet 9.0.318

lru

Input: 1000 1000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1-m.kt 284ms 4.7ms 95.4MB 503ms 33ms kotlin/jvm 21.0.12
csharp 2.cs 293ms 15ms 32.0MB 273ms 13ms dotnet 9.0.318
kotlin 2-m.kt 389ms 13ms 99.5MB 863ms 27ms kotlin/jvm 21.0.12
csharp 1.cs 2152ms 98ms 36.0MB 2140ms 20ms dotnet 9.0.318

Input: 1000 3000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1-m.kt 482ms 4.8ms 201.4MB 717ms 47ms kotlin/jvm 21.0.12
csharp 2.cs 484ms 2.4ms 29.8MB 463ms 13ms dotnet 9.0.318
kotlin 2-m.kt 543ms 5.7ms 209.8MB 993ms 67ms kotlin/jvm 21.0.12
csharp 1.cs 6072ms 312ms 36.0MB 6053ms 30ms dotnet 9.0.318

Input: 100 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 2.cs 203ms 0.2ms 31.9MB 180ms 10ms dotnet 9.0.318
kotlin 1-m.kt 255ms 1.9ms 91.1MB 500ms 37ms kotlin/jvm 21.0.12
kotlin 2-m.kt 302ms 15ms 95.4MB 693ms 23ms kotlin/jvm 21.0.12
csharp 1.cs 4300ms 12ms 33.1MB 4280ms 20ms dotnet 9.0.318

merkletrees

Input: 17

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1.kt 641ms 8.2ms 676.7MB 820ms 93ms kotlin/jvm 21.0.12
csharp 2.cs 904ms 34ms 135.4MB 880ms 93ms dotnet 9.0.318
csharp 1.cs 1035ms 40ms 163.4MB 1010ms 123ms dotnet 9.0.318

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1-m.kt 250ms 11ms 205.0MB 363ms 67ms kotlin/jvm 21.0.12
csharp 2.cs 304ms 5.8ms 74.7MB 257ms 57ms dotnet 9.0.318
csharp 1.cs 337ms 4.6ms 93.7MB 303ms 57ms dotnet 9.0.318

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 8.cs 783ms 1.5ms 29.6MB 760ms 10ms dotnet 9.0.318
kotlin 1.kt 884ms 6.3ms 49.9MB 980ms 17ms kotlin/jvm 21.0.12
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
csharp 8.cs 159ms 7.2ms 30.1MB 140ms 3ms dotnet 9.0.318
kotlin 1-m.kt 208ms 14ms 49.7MB 297ms 17ms kotlin/jvm 21.0.12
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
kotlin 1.kt 5427ms 177ms 419.0MB 6873ms 170ms kotlin/jvm 21.0.12

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
kotlin 1-m.kt 1629ms 66ms 362.2MB 3007ms 117ms kotlin/jvm 21.0.12

regex-redux

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 5.cs 2515ms 24ms 440.0MB 2690ms 250ms dotnet 9.0.318
csharp 6.cs 3319ms 218ms 437.6MB 3393ms 273ms dotnet 9.0.318
kotlin 1.kt 8673ms 241ms 178.9MB 9617ms 70ms kotlin/jvm 21.0.12

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 5.cs 394ms 5.1ms 73.8MB 370ms 33ms dotnet 9.0.318
csharp 6.cs 560ms 7.0ms 75.4MB 530ms 33ms dotnet 9.0.318
kotlin 1-m.kt 1293ms 57ms 133.7MB 2110ms 47ms kotlin/jvm 21.0.12

secp256k1

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 1.cs 4071ms 82ms 37.6MB 4150ms 47ms dotnet 9.0.318
kotlin 1.kt 5266ms 83ms 228.7MB 6800ms 87ms kotlin/jvm 21.0.12

Input: 500

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
csharp 1.cs 1287ms 120ms 37.8MB 1393ms 27ms dotnet 9.0.318
kotlin 1-m.kt 1750ms 44ms 260.1MB 2960ms 50ms kotlin/jvm 21.0.12