Programming Language and compiler
Benchmarks

Kotlin VS Java benchmarks

Current benchmark data was generated on Tue Mar 25 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
java 2.java 458ms 2.4ms 576.1MB 560ms 83ms openjdk 21
java 2-m.java 468ms 4.5ms 644.9MB 643ms 120ms graal/jvm 17.0.8
kotlin 1.kt 482ms 0.5ms 578.0MB 560ms 90ms kotlin/jvm 21
java 2.java 483ms 9.4ms 620.6MB 587ms 107ms openjdk 23
java 2.java 1240ms 21ms 1086.3MB 587ms 817ms openjdk/zgc 21
kotlin 1-m.kt 3201ms 42ms 246.5MB 5153ms 850ms kotlin/native 1.8.21

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1.kt 107ms 0.7ms 160.3MB 117ms 27ms kotlin/jvm 21
java 2-m.java 123ms 4.3ms 98.7MB 163ms 30ms openjdk 23
java 2.java 125ms 5.0ms 169.0MB 153ms 33ms openjdk 21
java 2-m.java 150ms 9.1ms 225.3MB 223ms 57ms graal/jvm 17.0.8
kotlin 1-m.kt 283ms 2.6ms 30.5MB 453ms 67ms kotlin/native 1.8.21
java 2.java 306ms 2.8ms 241.6MB 150ms 210ms openjdk/zgc 21

coro-prime-sieve

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 2-m.kt 1971ms 329ms 240.9MB 7313ms 117ms kotlin/jvm 21
kotlin 1.kt 2173ms 16ms 221.5MB 2997ms 77ms kotlin/jvm 21
java 1-m.java 2416ms 202ms 242.7MB 9177ms 143ms openjdk 23
java 1-m.java 2460ms 134ms 259.7MB 9333ms 137ms openjdk 21
java 1-m.java 2898ms 214ms 1236.9MB 9260ms 1187ms openjdk/zgc 21
kotlin 1.kt timeout 0.0ms 12.7MB 5997ms 487ms kotlin/native 1.8.21
kotlin 2-m.kt timeout 0.0ms 69.6MB 19047ms 153ms kotlin/native 1.8.21

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 2-m.kt 432ms 2.7ms 14.5MB 1600ms 20ms kotlin/native 1.8.21
java 1-m.java 440ms 30ms 92.7MB 1440ms 60ms openjdk 23
kotlin 1-m.kt 468ms 13ms 76.2MB 1060ms 43ms kotlin/jvm 21
java 1-m.java 488ms 40ms 121.4MB 1617ms 60ms openjdk 21
java 1-m.java 671ms 16ms 222.0MB 1810ms 263ms openjdk/zgc 21
kotlin 1.kt 689ms 14ms 8.8MB 817ms 63ms kotlin/native 1.8.21
kotlin 2-m.kt 815ms 9.7ms 96.8MB 2827ms 77ms kotlin/jvm 21

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1.kt 2.2ms 0.4ms 2.6MB 0ms 0ms kotlin/native 1.8.21
kotlin 1.kt 59ms 4.0ms 47.2MB 56ms 16ms kotlin/jvm 21
java 1.java 63ms 2.8ms 52.7MB 70ms 16ms graal/jvm 17.0.8
java 1.java 65ms 2.6ms 43.7MB 74ms 16ms openjdk 21
java 1.java 69ms 4.7ms 44.7MB 72ms 16ms openjdk 23
java 1.java 199ms 6.8ms 42.9MB 84ms 138ms openjdk/zgc 21

http-server

Input: 3000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 2-m.kt 4877ms 110ms 433.3MB 14973ms 2650ms kotlin/jvm 21
kotlin 1.kt timeout 0.0ms 400.8MB 16150ms 2810ms kotlin/jvm 21

Input: 500

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1-m.kt 2051ms 215ms 216.8MB 5830ms 630ms kotlin/jvm 21
kotlin 2-m.kt 2169ms 316ms 243.8MB 3967ms 420ms kotlin/jvm 21

json-serde

Input: sample 5000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1-m.kt 860ms 106ms 201.0MB 2313ms 90ms kotlin/jvm 21

Input: canada 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1-m.kt 2344ms 51ms 740.7MB 5013ms 167ms kotlin/jvm 21

lru

Input: 1000 1000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1-m.kt 181ms 4.2ms 96.8MB 300ms 27ms kotlin/jvm 21
kotlin 2-m.kt 198ms 2.0ms 103.5MB 420ms 40ms kotlin/jvm 21
kotlin 2.kt 310ms 2.1ms 5.9MB 433ms 20ms kotlin/native 1.8.21
kotlin 1.kt 518ms 11ms 5.8MB 620ms 3ms kotlin/native 1.8.21

Input: 1000 3000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 2-m.kt 307ms 3.5ms 215.7MB 537ms 43ms kotlin/jvm 21
kotlin 1.kt 335ms 2.6ms 204.7MB 443ms 43ms kotlin/jvm 21
kotlin 2.kt 927ms 16ms 7.1MB 1330ms 50ms kotlin/native 1.8.21
kotlin 1.kt 1539ms 8.4ms 5.8MB 1870ms 23ms kotlin/native 1.8.21

Input: 100 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 2.kt 142ms 1.4ms 3.6MB 200ms 0ms kotlin/native 1.8.21
kotlin 1-m.kt 142ms 1.4ms 92.3MB 267ms 30ms kotlin/jvm 21
kotlin 2-m.kt 153ms 3.2ms 95.8MB 303ms 30ms kotlin/jvm 21
kotlin 1.kt 171ms 1.8ms 3.8MB 217ms 0ms kotlin/native 1.8.21

merkletrees

Input: 17

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1.kt 361ms 2.6ms 681.5MB 383ms 97ms kotlin/jvm 21
java 1.java 402ms 1.4ms 539.4MB 503ms 83ms openjdk 23
java 1.java 403ms 0.8ms 679.7MB 470ms 100ms openjdk 21
java 1-m.java 407ms 4.5ms 624.7MB 617ms 97ms graal/jvm 17.0.8
java 1.java 1109ms 14ms 993.0MB 460ms 777ms openjdk/zgc 21
kotlin 1-m.kt 1532ms 6.5ms 134.6MB 2337ms 353ms kotlin/native 1.8.21

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1.kt 133ms 0.6ms 208.5MB 157ms 37ms kotlin/jvm 21
java 1-m.java 163ms 1.4ms 158.5MB 237ms 47ms openjdk 23
java 1-m.java 167ms 4.0ms 206.4MB 237ms 47ms openjdk 21
java 1-m.java 214ms 4.0ms 253.3MB 350ms 63ms graal/jvm 17.0.8
kotlin 1-m.kt 312ms 1.7ms 38.5MB 457ms 73ms kotlin/native 1.8.21
java 1.java 427ms 11ms 341.8MB 217ms 287ms openjdk/zgc 21

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1n.kt 404ms 1.3ms 2.5MB 393ms 0ms kotlin/native 1.8.21
java 1.java 445ms 1.2ms 45.1MB 487ms 17ms openjdk 21
java 1.java 448ms 0.8ms 48.1MB 483ms 20ms openjdk 23
java 1.java 451ms 5.3ms 82.3MB 480ms 30ms graal/jvm 17.0.8
kotlin 1.kt 453ms 4.2ms 49.4MB 497ms 20ms kotlin/jvm 21
java 1.java 570ms 6.7ms 44.6MB 483ms 140ms openjdk/zgc 21
java 2.java 1247ms 8.3ms 612.0MB 1383ms 87ms openjdk 21
java 2.java 1263ms 12ms 761.8MB 1380ms 107ms openjdk 23
java 2.java 3428ms 91ms 2585.6MB 1647ms 1983ms openjdk/zgc 21

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1n.kt 44ms 0.5ms 2.5MB 37ms 0ms kotlin/native 1.8.21
java 1.java 120ms 1.3ms 45.2MB 160ms 20ms openjdk 21
java 1.java 122ms 3.4ms 48.0MB 157ms 17ms openjdk 23
kotlin 1.kt 123ms 1.5ms 49.5MB 170ms 13ms kotlin/jvm 21
java 1.java 126ms 6.4ms 81.5MB 157ms 30ms graal/jvm 17.0.8
java 1.java 255ms 8.1ms 44.8MB 173ms 147ms openjdk/zgc 21
java 2-m.java 305ms 1.9ms 374.3MB 440ms 63ms openjdk 21
java 2-m.java 314ms 3.5ms 404.5MB 453ms 67ms openjdk 23
java 2.java 718ms 16ms 545.0MB 480ms 433ms openjdk/zgc 21

pidigits

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
java 1.java 3250ms 4.4ms 443.6MB 3687ms 107ms graal/jvm 17.0.8
java 1.java 3741ms 68ms 414.0MB 4627ms 120ms openjdk 23
kotlin 1.kt 3765ms 63ms 355.2MB 4593ms 107ms kotlin/jvm 21
java 1.java 3777ms 87ms 428.4MB 4617ms 110ms openjdk 21
java 1.java timeout 0.0ms 2126.2MB 4680ms 1213ms openjdk/zgc 21
kotlin 1n.kt timeout 0.0ms 5.4MB 6277ms 300ms kotlin/native 1.8.21
kotlin 2n.kt timeout 0.0ms 6.3MB 4990ms 180ms kotlin/native 1.8.21

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
java 1-m.java 904ms 8.4ms 445.7MB 1267ms 97ms graal/jvm 17.0.8
kotlin 1-m.kt 1000ms 30ms 355.3MB 1780ms 93ms kotlin/jvm 21
java 1-m.java 1004ms 16ms 422.6MB 1803ms 87ms openjdk 21
java 1-m.java 1030ms 26ms 432.7MB 1780ms 97ms openjdk 23
java 1.java 2045ms 43ms 1343.3MB 1747ms 1080ms openjdk/zgc 21
kotlin 1n.kt timeout 0.0ms 5.4MB 6287ms 287ms kotlin/native 1.8.21
kotlin 2n.kt timeout 0.0ms 6.2MB 5010ms 157ms kotlin/native 1.8.21

regex-redux

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
java 3.java timeout 0.0ms 407.4MB 5410ms 90ms graal/jvm 17.0.8
java 3.java timeout 0.0ms 302.6MB 5333ms 60ms openjdk 21
java 3.java timeout 0.0ms 304.8MB 5323ms 57ms openjdk 23
java 3.java timeout 0.0ms 466.5MB 4970ms 297ms openjdk/zgc 21
kotlin 1.kt timeout 0.0ms 171.3MB 5430ms 43ms kotlin/jvm 21
kotlin 1n.kt timeout 0.0ms 277.0MB 5163ms 730ms kotlin/native 1.8.21

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
java 3-m.java 780ms 19ms 175.3MB 1153ms 60ms graal/jvm 17.0.8
java 3-m.java 796ms 7.9ms 132.5MB 1203ms 33ms openjdk 23
java 3-m.java 796ms 1.8ms 130.5MB 1183ms 37ms openjdk 21
kotlin 1-m.kt 821ms 21ms 137.7MB 1247ms 47ms kotlin/jvm 21
java 3.java 981ms 13ms 133.4MB 1140ms 190ms openjdk/zgc 21
kotlin 1n.kt 3187ms 12ms 65.0MB 3933ms 17ms kotlin/native 1.8.21

secp256k1

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1.kt 3098ms 21ms 233.4MB 3973ms 77ms kotlin/jvm 21

Input: 500

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1-m.kt 1009ms 48ms 235.5MB 1923ms 73ms kotlin/jvm 21