A benchmark suite to compare the performance of different approaches to count the number of instances of a case-insensitive character in a string / if the string contains the character.
There are 3 classes under test, KotlinLetterUtils which contains
different approaches to counting / testing contains; JavaStreamLetterUtils
which contains an implementation, and JavaLetterUtils which contains a Java
implementation for the highest performing count and contains method from
KotlinLetterUtils.
Each benchmark calls the function under test with each of the currently handled characters (b, g, i, u) for each named item in the KoLMafia item database. This comes out to ~45000 iterations per "operation".
Results from Eclipse Temurin-17.0.7+7 running on a 2021 M1 MacBook Pro
| Benchmark | Mode | Threads | Samples | Score | Score Error (99.9%) | Unit |
|---|---|---|---|---|---|---|
| JavaLetterUtilsBenchMark.Contains | thrpt | 4 | 6 | 9031.452181 | 800.965842 | ops/s |
| JavaLetterUtilsBenchMark.Count | thrpt | 4 | 6 | 4320.077471 | 110.106593 | ops/s |
| JavaStreamLetterUtilsBenchmark.Contains | thrpt | 4 | 6 | 1038.529858 | 33.871498 | ops/s |
| JavaStreamLetterUtilsBenchmark.Count | thrpt | 4 | 6 | 2011.533655 | 85.353167 | ops/s |
| KotlinContainsBenchmark.containsByChar | thrpt | 4 | 6 | 6297.916380 | 178.359130 | ops/s |
| KotlinContainsBenchmark.containsByIndexOfAny | thrpt | 4 | 6 | 4601.296659 | 129.469970 | ops/s |
| KotlinContainsBenchmark.containsByPattern | thrpt | 4 | 6 | 2473.709581 | 114.643305 | ops/s |
| KotlinContainsBenchmark.containsByStringContains | thrpt | 4 | 6 | 8223.353206 | 2562.182194 | ops/s |
| KotlinContainsBenchmark.containsByStringInverted | thrpt | 4 | 6 | 6716.641838 | 3187.332452 | ops/s |
| KotlinCountBenchmark.countByChar | thrpt | 4 | 6 | 4409.035243 | 97.715518 | ops/s |
| KotlinCountBenchmark.countByInsensitiveLowerPattern | thrpt | 4 | 6 | 1153.940347 | 320.689433 | ops/s |
| KotlinCountBenchmark.countByInsensitiveUpperPattern | thrpt | 4 | 6 | 1154.217495 | 215.026430 | ops/s |
| KotlinCountBenchmark.countByPattern | thrpt | 4 | 6 | 1014.031989 | 422.830255 | ops/s |