Programming Language and compiler
Benchmarks

Swift VS Java benchmarks

Current benchmark data was generated on Fri Aug 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
java 2.java 460ms 9.2ms 574.1MB 553ms 83ms openjdk 21
java 2.java 470ms 8.8ms 624.4MB 577ms 97ms openjdk 23
java 2-m.java 480ms 9.9ms 640.7MB 680ms 110ms graal/jvm 17.0.8
java 2.java 1176ms 13ms 1047.1MB 593ms 757ms openjdk/zgc 21
swift 1.swift 2661ms 31ms 53.6MB 2630ms 17ms swift 6.1.2

Input: 15

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
java 2.java 120ms 4.9ms 168.1MB 150ms 30ms openjdk 21
java 2-m.java 123ms 0.5ms 97.0MB 173ms 23ms openjdk 23
java 2-m.java 144ms 3.8ms 224.3MB 210ms 57ms graal/jvm 17.0.8
swift 1.swift 242ms 3.3ms 11.9MB 230ms 0ms swift 6.1.2
java 2.java 304ms 3.3ms 241.5MB 163ms 190ms openjdk/zgc 21

fannkuch-redux

Input: 11

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
java 1-m.java 901ms 5.9ms 96.3MB 3333ms 40ms graal/jvm 17.0.8
java 1-m.java 977ms 10ms 48.5MB 3650ms 23ms openjdk 21
java 1-m.java 989ms 7.9ms 50.1MB 3647ms 20ms openjdk 23
java 1-m.java 1042ms 4.8ms 45.7MB 3417ms 137ms openjdk/zgc 21
swift 1.swift 2469ms 4.7ms 5.4MB 2460ms 0ms swift 6.1.2

Input: 10

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
java 1-m.java 188ms 18ms 48.6MB 537ms 20ms openjdk 21
java 1-m.java 195ms 1.4ms 50.2MB 520ms 20ms openjdk 23
java 1-m.java 202ms 10ms 96.3MB 560ms 40ms graal/jvm 17.0.8
swift 1.swift 213ms 0.4ms 6.1MB 200ms 0ms swift 6.1.2
java 1-m.java 309ms 8.1ms 46.1MB 513ms 137ms openjdk/zgc 21

fasta

Input: 2500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 3-m.swift 138ms 0.6ms 20.7MB 400ms 3ms swift 6.1.2
java 4.java 444ms 5.1ms 102.5MB 623ms 37ms graal/jvm 17.0.8
java 4.java 449ms 3.8ms 47.3MB 530ms 17ms openjdk 21
java 4.java 459ms 2.0ms 49.0MB 543ms 23ms openjdk 23
java 4.java 565ms 3.7ms 45.2MB 533ms 137ms openjdk/zgc 21

Input: 250000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 3.swift 37ms 0.3ms 14.2MB 30ms 0ms swift 6.1.2
java 4.java 118ms 6.7ms 46.6MB 160ms 17ms openjdk 21
java 4-m.java 125ms 7.8ms 89.8MB 170ms 30ms graal/jvm 17.0.8
java 4.java 125ms 0.3ms 47.7MB 167ms 17ms openjdk 23
java 4.java 239ms 8.3ms 44.0MB 157ms 137ms openjdk/zgc 21

helloworld

Input: QwQ

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 1.swift 2.2ms 0.2ms 5.6MB 0ms 0ms swift 6.1.2
java 1.java 62ms 1.4ms 52.9MB 64ms 20ms graal/jvm 17.0.8
java 1.java 69ms 4.7ms 43.9MB 78ms 10ms openjdk 21
java 1.java 73ms 1.9ms 44.7MB 74ms 16ms openjdk 23
java 1.java 186ms 3.9ms 42.9MB 82ms 132ms openjdk/zgc 21

knucleotide

Input: 2500000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
java 3-m.java 1059ms 24ms 128.6MB 3640ms 40ms openjdk 21
java 3-m.java 1069ms 27ms 156.2MB 3697ms 50ms openjdk 23
java 3-m.java 1111ms 8.8ms 177.8MB 3810ms 60ms graal/jvm 17.0.8
swift 2-m.swift 1313ms 5.4ms 70.6MB 4803ms 27ms swift 6.1.2
java 3-m.java 1432ms 47ms 179.5MB 4517ms 200ms openjdk/zgc 21

Input: 250000_in

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 2-m.swift 250ms 2.2ms 60.0MB 663ms 30ms swift 6.1.2
java 3-m.java 320ms 31ms 101.7MB 927ms 40ms openjdk 21
java 3-m.java 338ms 8.1ms 89.9MB 1003ms 40ms openjdk 23
java 3-m.java 351ms 21ms 139.6MB 963ms 53ms graal/jvm 17.0.8
java 3-m.java 432ms 6.3ms 98.5MB 910ms 163ms openjdk/zgc 21

nbody

Input: 5000000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 7.swift 343ms 0.8ms 9.9MB 330ms 0ms swift 6.1.2
java 1.java 442ms 1.6ms 81.4MB 473ms 23ms graal/jvm 17.0.8
java 1.java 445ms 1.9ms 47.7MB 480ms 17ms openjdk 23
java 1.java 446ms 15ms 45.2MB 487ms 13ms openjdk 21
java 1.java 567ms 4.2ms 44.9MB 490ms 140ms openjdk/zgc 21
java 2.java 1238ms 17ms 608.0MB 1377ms 77ms openjdk 21
java 2.java 1243ms 5.5ms 744.5MB 1360ms 97ms openjdk 23
java 2.java 3248ms 81ms 2438.6MB 1660ms 1800ms openjdk/zgc 21

Input: 500000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
swift 7.swift 39ms 0.1ms 9.8MB 30ms 0ms swift 6.1.2
java 1.java 116ms 4.3ms 45.3MB 153ms 20ms openjdk 21
java 1.java 121ms 0.2ms 47.8MB 153ms 17ms openjdk 23
java 1-m.java 122ms 8.7ms 81.5MB 153ms 33ms graal/jvm 17.0.8
java 1.java 247ms 2.0ms 44.8MB 173ms 140ms openjdk/zgc 21
java 2-m.java 291ms 5.9ms 373.0MB 427ms 53ms openjdk 21
java 2-m.java 307ms 7.7ms 397.4MB 443ms 67ms openjdk 23
java 2.java 671ms 7.7ms 522.5MB 477ms 387ms openjdk/zgc 21

pidigits

Input: 8000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
java 1.java 3168ms 8.2ms 444.5MB 3577ms 97ms graal/jvm 17.0.8
java 1.java 3667ms 34ms 351.6MB 4527ms 113ms openjdk 21
java 1.java 3722ms 53ms 381.7MB 4533ms 113ms openjdk 23
java 1.java timeout 0.0ms 1806.3MB 4663ms 1183ms openjdk/zgc 21
swift 1.swift timeout 0.0ms 7.3MB 4930ms 57ms swift 6.1.2

Input: 4000

lang code time stddev peak-mem mem time(user) time(sys) compiler compiler/runtime
java 1.java 882ms 6.0ms 444.1MB 1227ms 87ms graal/jvm 17.0.8
java 1-m.java 1009ms 31ms 430.6MB 1757ms 100ms openjdk 23
java 1-m.java 1016ms 30ms 351.1MB 1783ms 83ms openjdk 21
swift 1.swift 1856ms 13ms 7.0MB 1847ms 0ms swift 6.1.2
java 1.java 1974ms 2.9ms 1319.5MB 1730ms 1020ms openjdk/zgc 21