84 lines
2.8 KiB
Kotlin
84 lines
2.8 KiB
Kotlin
/*
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* Copyright 2025 Sergey S. Chernov real.sergeych@gmail.com
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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/*
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* Multithreaded benchmark to quantify SCOPE_POOL speedup on JVM.
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*/
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import kotlinx.coroutines.*
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import net.sergeych.lyng.PerfFlags
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import net.sergeych.lyng.Scope
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import net.sergeych.lyng.obj.ObjInt
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import kotlin.math.max
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import kotlin.math.min
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import kotlin.test.Test
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import kotlin.test.assertEquals
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class ConcurrencyCallBenchmarkTest {
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private suspend fun parallelEval(workers: Int, script: String): List<Long> = coroutineScope {
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(0 until workers).map { async { (Scope().eval(script) as ObjInt).value } }.awaitAll()
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}
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@Test
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fun benchmark_multithread_calls_off_on() = runBlocking {
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val cpu = Runtime.getRuntime().availableProcessors()
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val workers = min(max(2, cpu), 8)
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val iterations = 15_000 // per worker; keep CI fast
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val script = """
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fun f0() { 1 }
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fun f1(a) { a }
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fun f2(a,b) { a + b }
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fun f3(a,b,c) { a + b + c }
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fun f4(a,b,c,d) { a + b + c + d }
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var s = 0
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var i = 0
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while (i < $iterations) {
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s = s + f0()
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s = s + f1(1)
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s = s + f2(1, 1)
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s = s + f3(1, 1, 1)
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s = s + f4(1, 1, 1, 1)
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i = i + 1
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}
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s
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""".trimIndent()
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val expected = (1 + 1 + 2 + 3 + 4).toLong() * iterations
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// OFF
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PerfFlags.SCOPE_POOL = false
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val t0 = System.nanoTime()
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val off = withContext(Dispatchers.Default) { parallelEval(workers, script) }
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val t1 = System.nanoTime()
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// ON
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PerfFlags.SCOPE_POOL = true
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val t2 = System.nanoTime()
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val on = withContext(Dispatchers.Default) { parallelEval(workers, script) }
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val t3 = System.nanoTime()
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// reset
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PerfFlags.SCOPE_POOL = false
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off.forEach { assertEquals(expected, it) }
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on.forEach { assertEquals(expected, it) }
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val offMs = (t1 - t0) / 1_000_000.0
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val onMs = (t3 - t2) / 1_000_000.0
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val speedup = offMs / onMs
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println("[DEBUG_LOG] [BENCH] ConcurrencyCallBenchmark workers=$workers iters=$iterations each: OFF=${"%.3f".format(offMs)} ms, ON=${"%.3f".format(onMs)} ms, speedup=${"%.2f".format(speedup)}x")
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}
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}
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