From 138437f2cf4e965ba07212a10589a517f81623a8 Mon Sep 17 00:00:00 2001 From: Afshin Zafari Date: Fri, 20 Oct 2023 08:33:40 +0000 Subject: [PATCH] 8314438: NMT: Performance benchmarks are needed to have a baseline for comparison of improvements Reviewed-by: gziemski, ihse --- make/test/BuildMicrobenchmark.gmk | 1 + .../bench/vm/runtime/NMTBenchmark.java | 252 ++++++++++++++++++ 2 files changed, 253 insertions(+) create mode 100644 test/micro/org/openjdk/bench/vm/runtime/NMTBenchmark.java diff --git a/make/test/BuildMicrobenchmark.gmk b/make/test/BuildMicrobenchmark.gmk index d6caf33e875df..0785688f09c30 100644 --- a/make/test/BuildMicrobenchmark.gmk +++ b/make/test/BuildMicrobenchmark.gmk @@ -107,6 +107,7 @@ $(eval $(call SetupJavaCompilation, BUILD_JDK_MICROBENCHMARK, \ --add-exports java.base/jdk.internal.org.objectweb.asm=ALL-UNNAMED \ --add-exports java.base/jdk.internal.org.objectweb.asm.tree=ALL-UNNAMED \ --add-exports java.base/jdk.internal.vm=ALL-UNNAMED \ + --add-exports java.base/jdk.internal.misc=ALL-UNNAMED \ --add-exports java.base/jdk.internal.event=ALL-UNNAMED \ --add-exports java.base/jdk.internal.foreign=ALL-UNNAMED \ --enable-preview \ diff --git a/test/micro/org/openjdk/bench/vm/runtime/NMTBenchmark.java b/test/micro/org/openjdk/bench/vm/runtime/NMTBenchmark.java new file mode 100644 index 0000000000000..9337b4df5313c --- /dev/null +++ b/test/micro/org/openjdk/bench/vm/runtime/NMTBenchmark.java @@ -0,0 +1,252 @@ +/* + * Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +package org.openjdk.bench.vm.runtime; + +import org.openjdk.jmh.annotations.*; +import org.openjdk.jmh.infra.Blackhole; + +import jdk.internal.misc.Unsafe; +import java.util.concurrent.TimeUnit; + +/** + * The purpose of these microbenchmarks is to get the overhead of NMT in disable/summary/detail mode. + */ + +@BenchmarkMode(Mode.AverageTime) +@OutputTimeUnit(TimeUnit.MILLISECONDS) +@State(Scope.Benchmark) +@Warmup(iterations = 2, time = 1, timeUnit = TimeUnit.SECONDS) +@Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS) +public abstract class NMTBenchmark { + static final int S = 1024; + + Unsafe unsafe; + long addresses[]; + + //@Param({"100000", "1000000"}) + @Param({"100000"}) + public int N; + + @Param({"0", "4"}) + public int THREADS; + + // Each TestThread instance allocates/frees a portion (`start` to `end`) of the `addresses` array. + // The thread index and a flag for doing allocate or freeing it are sent to the constructor. + private class TestThread extends Thread { + private int thr_index; + private int count; + private int start, end; + private boolean allocate; + + public TestThread(int index, boolean alloc_or_free) { + thr_index = index; + count = N / THREADS; + start = thr_index * count; + end = start + count; + allocate = alloc_or_free; + } + + public void run() { + for (int i = start; i < end; i++) { + if (allocate) { + alloc(i); + } else { + deallocate(i); + } + } + } + + // make a deeper and different stack trace + // NMT uses hash of stack trace to store them in a static table. + // So, if all allocations come from the same call-site, they all hashed into one entry in that table. + private void alloc(int i) { + if (i % 3 == 0) alloc0(i); + if (i % 3 == 1) alloc1(i); + if (i % 3 == 2) alloc2(i); + } + private void alloc0(int i) { + if (unsafe == null) return; + addresses[i] = unsafe.allocateMemory(S); + } + private void alloc1(int i) { alloc0(i); } + private void alloc2(int i) { alloc1(i); } + + private void deallocate(int i) { + if (unsafe == null) + return; + + if (addresses[i] != 0) { + unsafe.freeMemory(addresses[i]); + addresses[i] = 0; + } + } + } + + @Benchmark + public void mixAallocateFreeMemory(Blackhole bh) throws InterruptedException{ + + Unsafe unsafe = Unsafe.getUnsafe(); + if (unsafe == null) { + throw new InterruptedException(); + } + + addresses = new long[N]; + if (THREADS != 0) { // Multi-threaded + TestThread threads[] = new TestThread[THREADS]; + + for (int t = 0; t < THREADS; t++) { + // One half of threads allocate and the other half free the memory + threads[t] = new TestThread(t, t < (THREADS / 2) ? true : false); + threads[t].start(); + } + + for (int t = 0; t < THREADS; t++) { + try { + threads[t].join(); + } catch (InterruptedException ie) { + // do nothing + } + } + } else { // No threads used. + + for (int i = 0; i < N; i++) { + addresses[i] = unsafe.allocateMemory(S); + //Mixing alloc/free + if (i % 3 == 0) { + if (addresses[i] != 0) { + unsafe.freeMemory(addresses[i]); + addresses[i] = 0; + } + } + } + + for (int i = 0; i < N; i++) { + if (i % 2 == 0) { + if (addresses[i] != 0) { + unsafe.freeMemory(addresses[i]); + addresses[i] = 0; + } + } + } + + // free the rest of allocations + for (int i = 0; i < N; i++) { + if (addresses[i] != 0) { + unsafe.freeMemory(addresses[i]); + addresses[i] = 0; + } + } + } + } + + @Benchmark + public void onlyAllocateMemory() throws InterruptedException { + Unsafe unsafe = Unsafe.getUnsafe(); + if (unsafe == null) { + throw new InterruptedException(); + } + + addresses = new long[N]; + if (THREADS != 0) { // Multi-threaded + TestThread threads[] = new TestThread[THREADS]; + + for (int t = 0; t < THREADS; t++) { + // One half of threads allocate and the other half free the memory + threads[t] = new TestThread(t, t < (THREADS / 2) ? true : false); + threads[t].start(); + } + + for (int t = 0; t < THREADS; t++) { + try { + threads[t].join(); + } catch (InterruptedException ie) { + // do nothing + } + } + } else { // No threads used. + for (int i = 0; i < N; i++) { + addresses[i] = unsafe.allocateMemory(S); + } + } + } + + @Benchmark + public void mixAllocateReallocateMemory() throws InterruptedException { + Unsafe unsafe = Unsafe.getUnsafe(); + if (unsafe == null) { + throw new InterruptedException(); + } + + addresses = new long[N]; + if (THREADS != 0) { // Multi-threaded + TestThread threads[] = new TestThread[THREADS]; + + for (int t = 0; t < THREADS; t++) { + // One half of threads allocate and the other half free the memory + threads[t] = new TestThread(t, t < (THREADS / 2) ? true : false); + threads[t].start(); + } + + for (int t = 0; t < THREADS; t++) { + try { + threads[t].join(); + } catch (InterruptedException ie) { + // do nothing + } + } + } else { // No threads used. + for (int i = 0; i < N; i++) { + addresses[i] = unsafe.allocateMemory(S); + //Mixing alloc/realloc + if (i % 3 == 0) { + if (addresses[i] != 0) { + unsafe.reallocateMemory(addresses[i], S * 2); + addresses[i] = 0; + } + } + } + + for (int i = 0; i < N; i++) { + if (i % 2 == 0) { + if (addresses[i] != 0) { + unsafe.reallocateMemory(addresses[i], S / 2); + addresses[i] = 0; + } + } + } + } + } + + public static final String ADD_EXPORTS = "--add-exports"; + public static final String MISC_PACKAGE = "java.base/jdk.internal.misc=ALL-UNNAMED"; // used for Unsafe API + + @Fork(value = 2, jvmArgsPrepend = { "-XX:NativeMemoryTracking=off", ADD_EXPORTS, MISC_PACKAGE}) + public static class NMTOff extends NMTBenchmark { } + + @Fork(value = 2, jvmArgsPrepend = { "-XX:NativeMemoryTracking=summary", ADD_EXPORTS, MISC_PACKAGE}) + public static class NMTSummary extends NMTBenchmark { } + + @Fork(value = 2, jvmArgsPrepend = { "-XX:NativeMemoryTracking=detail", ADD_EXPORTS, MISC_PACKAGE}) + public static class NMTDetail extends NMTBenchmark { } +}