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Add a benchmark on individual Unicode codepoints reading/writing #320

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Jun 12, 2024
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Add a benchmark on individual Unicode codepoints reading/writing #320

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65 changes: 65 additions & 0 deletions benchmarks/src/commonMain/kotlin/BufferOps.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@ package kotlinx.io.benchmarks
import kotlinx.benchmark.*
import kotlinx.io.*
import kotlinx.io.bytestring.ByteString
import kotlin.random.Random

@State(Scope.Benchmark)
abstract class BufferRWBenchmarkBase {
Expand Down Expand Up @@ -415,3 +416,67 @@ open class IndexOfByteString {
@Benchmark
fun benchmark() = buffer.indexOf(byteString)
}

@State(Scope.Benchmark)
open class Utf8CodePointsBenchmark : BufferRWBenchmarkBase() {
private val codePointsCount = 128

// Encoding names follow naming from Utf8StringBenchmark
@Param("ascii", "utf8", "sparse", "2bytes", "3bytes", "4bytes", "bad")
var encoding: String = "ascii"
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Maybe it's better to use enum in such cases?

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I decided to use the same values as for the old read/writeString benchmark. I can replace the parameter with enum, but then the old value need to be replaced (especially 2|3|4bytes), and that would complicate results comparison against older releases.


override fun padding(): ByteArray {
return ByteArray(minGap) { '.'.code.toByte() }
}

private val codePoints = IntArray(codePointsCount)
private var codePointIdx = 0

@Setup
fun fillCodePointsArray() {
fun IntArray.fill(generator: () -> Int) {
for (idx in this.indices) {
this[idx] = generator()
}
}

when (encoding) {
"ascii" -> codePoints.fill { Random.nextInt(' '.code, '~'.code) }
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Why are codes less than 0x20 ignored?)

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Just a personal preference :)

"utf8" -> codePoints.fill {
var cp: Int
do {
cp = Random.nextInt(0, 0x10ffff)
} while (cp in 0xd800 .. 0xdfff)
cp
}
"sparse" -> {
codePoints.fill { Random.nextInt(' '.code, '~'.code) }
codePoints[42] = '⌛'.code
}
"2bytes" -> codePoints.fill { Random.nextInt(0x80, 0x800) }
"3bytes" -> codePoints.fill {
var cp: Int
do {
cp = Random.nextInt(0x800, 0x10000)
} while (cp in 0xd800 .. 0xdfff)
cp
}
"4bytes" -> codePoints.fill { Random.nextInt(0x10000, 0x10ffff) }
"bad" -> codePoints.fill { Random.nextInt(0xd800, 0xdfff) }
}
}


private fun nextCodePoint(): Int {
val idx = codePointIdx
val cp = codePoints[idx]
codePointIdx = (idx + 1) % codePointsCount
return cp
}

@Benchmark
fun benchmark(): Int {
buffer.writeCodePointValue(nextCodePoint())
return buffer.readCodePointValue()
}
}