Programming Language and compiler
Benchmarks

Kotlin VS Java benchmarks

Current benchmark data was generated on Mon May 19 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 6.7ms 574.1MB 563ms 77ms openjdk 21
java 2-m.java 466ms 7.3ms 643.0MB 657ms 117ms graal/jvm 17.0.8
java 2.java 468ms 2.3ms 638.7MB 577ms 87ms openjdk 23
kotlin 1.kt 491ms 9.8ms 576.6MB 603ms 80ms kotlin/jvm 21
java 2.java 1195ms 46ms 1101.7MB 577ms 787ms openjdk/zgc 21
kotlin 1.kt 4175ms 24ms 143.7MB 4367ms 73ms kotlin/native 2.1.20

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1.kt 121ms 0.9ms 159.3MB 150ms 30ms kotlin/jvm 21
java 2.java 128ms 1.6ms 167.0MB 157ms 33ms openjdk 21
java 2.java 133ms 5.7ms 96.5MB 163ms 30ms openjdk 23
java 2-m.java 152ms 7.0ms 215.4MB 227ms 57ms graal/jvm 17.0.8
kotlin 1.kt 235ms 15ms 17.6MB 240ms 7ms kotlin/native 2.1.20
java 2.java 308ms 9.8ms 241.5MB 170ms 193ms 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 1893ms 160ms 233.8MB 7030ms 100ms kotlin/jvm 21
kotlin 1.kt 2169ms 49ms 220.1MB 3017ms 67ms kotlin/jvm 21
java 1-m.java 2237ms 158ms 258.9MB 8497ms 143ms openjdk 21
java 1-m.java 2494ms 200ms 242.9MB 9503ms 130ms openjdk 23
java 1-m.java 2940ms 99ms 1203.7MB 9563ms 1067ms openjdk/zgc 21
kotlin 2-m.kt 4283ms 17ms 21.6MB 14280ms 553ms kotlin/native 2.1.20
kotlin 1.kt timeout 0.0ms 17.4MB 5517ms 30ms kotlin/native 2.1.20

Input: 1000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 2-m.kt 248ms 4.5ms 21.1MB 837ms 40ms kotlin/native 2.1.20
kotlin 1.kt 395ms 2.7ms 17.4MB 403ms 7ms kotlin/native 2.1.20
java 1-m.java 467ms 39ms 121.7MB 1563ms 73ms openjdk 21
java 1-m.java 480ms 45ms 94.9MB 1580ms 57ms openjdk 23
kotlin 1-m.kt 495ms 6.5ms 76.4MB 1130ms 40ms kotlin/jvm 21
java 1-m.java 668ms 8.4ms 212.9MB 1767ms 267ms openjdk/zgc 21
kotlin 2-m.kt 920ms 72ms 97.4MB 3233ms 77ms kotlin/jvm 21

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1.kt 2.1ms 0.2ms 3.0MB 0ms 0ms kotlin/native 2.1.20
kotlin 1.kt 64ms 5.9ms 47.6MB 78ms 18ms kotlin/jvm 21
java 1.java 65ms 2.3ms 53.1MB 68ms 20ms graal/jvm 17.0.8
java 1.java 70ms 6.5ms 44.7MB 80ms 14ms openjdk 23
java 1.java 70ms 4.4ms 43.9MB 76ms 18ms openjdk 21
java 1.java 194ms 7.5ms 43.0MB 86ms 142ms 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 1613ms 2795ms 455.2MB 15463ms 2483ms kotlin/jvm 21
kotlin 1.kt timeout 0.0ms 427.0MB 16450ms 2593ms kotlin/jvm 21

Input: 500

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1-m.kt 2080ms 193ms 220.2MB 5967ms 640ms kotlin/jvm 21
kotlin 2-m.kt 2084ms 210ms 242.8MB 5633ms 620ms 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 776ms 95ms 175.3MB 2097ms 80ms kotlin/jvm 21

Input: canada 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1-m.kt 1835ms 40ms 693.1MB 4310ms 167ms kotlin/jvm 21

lru

Input: 1000 1000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 2.kt 168ms 4.4ms 12.4MB 170ms 0ms kotlin/native 2.1.20
kotlin 1-m.kt 192ms 2.4ms 94.9MB 323ms 20ms kotlin/jvm 21
kotlin 2-m.kt 209ms 14ms 101.4MB 453ms 43ms kotlin/jvm 21
kotlin 1.kt 353ms 2.2ms 12.5MB 353ms 0ms kotlin/native 2.1.20

Input: 1000 3000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 2-m.kt 313ms 0.5ms 214.0MB 540ms 50ms kotlin/jvm 21
kotlin 1.kt 340ms 2.2ms 203.2MB 463ms 37ms kotlin/jvm 21
kotlin 2.kt 474ms 3.0ms 12.4MB 500ms 7ms kotlin/native 2.1.20
kotlin 1.kt 1035ms 8.5ms 12.4MB 1070ms 0ms kotlin/native 2.1.20

Input: 100 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 2.kt 95ms 0.4ms 12.8MB 87ms 3ms kotlin/native 2.1.20
kotlin 1.kt 121ms 0.9ms 12.8MB 110ms 0ms kotlin/native 2.1.20
kotlin 1-m.kt 153ms 3.0ms 90.4MB 287ms 30ms kotlin/jvm 21
kotlin 2-m.kt 169ms 8.2ms 95.6MB 340ms 30ms kotlin/jvm 21

merkletrees

Input: 17

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1.kt 395ms 2.5ms 678.6MB 450ms 83ms kotlin/jvm 21
java 1.java 404ms 4.9ms 534.3MB 500ms 93ms openjdk 23
java 1.java 406ms 4.3ms 679.8MB 490ms 90ms openjdk 21
java 1-m.java 408ms 8.7ms 626.3MB 617ms 97ms graal/jvm 17.0.8
java 1.java 1026ms 1.9ms 933.9MB 487ms 690ms openjdk/zgc 21
kotlin 1.kt 2036ms 172ms 90.1MB 2113ms 47ms kotlin/native 2.1.20

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1-m.kt 155ms 2.4ms 207.3MB 203ms 50ms kotlin/jvm 21
java 1-m.java 167ms 1.6ms 206.1MB 240ms 43ms openjdk 21
java 1-m.java 168ms 1.1ms 158.3MB 247ms 40ms openjdk 23
java 1-m.java 216ms 12ms 253.2MB 367ms 60ms graal/jvm 17.0.8
kotlin 1.kt 293ms 4.6ms 25.6MB 297ms 10ms kotlin/native 2.1.20
java 1.java 419ms 8.2ms 341.9MB 217ms 280ms openjdk/zgc 21

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1n.kt 353ms 3.9ms 3.6MB 343ms 0ms kotlin/native 2.1.20
kotlin 1.kt 445ms 1.8ms 49.2MB 490ms 20ms kotlin/jvm 21
java 1.java 445ms 0.4ms 45.0MB 490ms 13ms openjdk 21
java 1.java 446ms 3.8ms 48.4MB 477ms 20ms openjdk 23
java 1.java 447ms 2.3ms 82.2MB 477ms 27ms graal/jvm 17.0.8
java 1.java 577ms 2.1ms 44.8MB 497ms 140ms openjdk/zgc 21
java 2.java 1252ms 5.6ms 639.9MB 1390ms 87ms openjdk 21
java 2.java 1277ms 19ms 794.0MB 1390ms 113ms openjdk 23
java 2.java 3274ms 53ms 2445.6MB 1653ms 1830ms openjdk/zgc 21

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1n.kt 39ms 0.2ms 3.6MB 30ms 0ms kotlin/native 2.1.20
java 1.java 120ms 4.0ms 48.0MB 153ms 20ms openjdk 23
kotlin 1-m.kt 121ms 2.3ms 49.4MB 170ms 20ms kotlin/jvm 21
java 1.java 122ms 2.1ms 44.9MB 167ms 13ms openjdk 21
java 1-m.java 123ms 4.2ms 81.5MB 157ms 33ms graal/jvm 17.0.8
java 1.java 249ms 3.8ms 44.9MB 157ms 147ms openjdk/zgc 21
java 2-m.java 302ms 22ms 344.8MB 437ms 53ms openjdk 21
java 2-m.java 313ms 7.2ms 400.0MB 443ms 70ms openjdk 23
java 2.java 684ms 17ms 532.7MB 467ms 407ms openjdk/zgc 21

pidigits

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
java 1.java 3209ms 4.7ms 445.5MB 3633ms 100ms graal/jvm 17.0.8
java 1.java 3722ms 68ms 433.0MB 4600ms 107ms openjdk 21
kotlin 1.kt 3724ms 64ms 352.5MB 4500ms 100ms kotlin/jvm 21
java 1.java 3750ms 35ms 408.8MB 4670ms 107ms openjdk 23
java 1.java timeout 0.0ms 1830.0MB 4663ms 1203ms openjdk/zgc 21
kotlin 1n.kt timeout 0.0ms 26.3MB 3990ms 1497ms kotlin/native 2.1.20
kotlin 2n.kt timeout 0.0ms 30.6MB 5130ms 127ms kotlin/native 2.1.20

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
java 1.java 888ms 5.7ms 448.3MB 1230ms 87ms graal/jvm 17.0.8
java 1-m.java 985ms 9.3ms 423.2MB 1833ms 87ms openjdk 21
java 1-m.java 1005ms 39ms 488.4MB 1760ms 110ms openjdk 23
kotlin 1-m.kt 1018ms 20ms 353.5MB 1703ms 90ms kotlin/jvm 21
java 1.java 1983ms 5.7ms 1312.1MB 1770ms 1033ms openjdk/zgc 21
kotlin 1n.kt timeout 0.0ms 26.7MB 3990ms 1510ms kotlin/native 2.1.20
kotlin 2n.kt timeout 0.0ms 30.6MB 5113ms 130ms kotlin/native 2.1.20

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 399.2MB 5400ms 90ms graal/jvm 17.0.8
java 3.java timeout 0.0ms 302.2MB 5327ms 60ms openjdk 21
java 3.java timeout 0.0ms 305.0MB 5323ms 63ms openjdk 23
java 3.java timeout 0.0ms 468.6MB 4970ms 293ms openjdk/zgc 21
kotlin 1.kt timeout 0.0ms 173.6MB 5407ms 47ms kotlin/jvm 21
kotlin 1n.kt timeout 0.0ms 226.8MB 5080ms 117ms kotlin/native 2.1.20

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
java 3-m.java 772ms 8.0ms 176.1MB 1150ms 57ms graal/jvm 17.0.8
java 3-m.java 798ms 9.3ms 128.8MB 1187ms 37ms openjdk 21
java 3-m.java 805ms 18ms 132.4MB 1233ms 43ms openjdk 23
kotlin 1-m.kt 839ms 12ms 134.6MB 1270ms 40ms kotlin/jvm 21
java 3.java 985ms 10ms 133.8MB 1160ms 190ms openjdk/zgc 21
kotlin 1n.kt 3231ms 31ms 51.1MB 3300ms 70ms kotlin/native 2.1.20

secp256k1

Input: 2000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1.kt 3038ms 2.3ms 231.8MB 4063ms 77ms kotlin/jvm 21

Input: 500

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
kotlin 1-m.kt 979ms 51ms 232.1MB 1937ms 67ms kotlin/jvm 21