104 lines
4.4 KiB
Java
104 lines
4.4 KiB
Java
/*
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* Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2024, Red Hat Inc.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8332122
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* @summary Test to verify correctness of peak malloc tracking
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* @key randomness
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* @library /test/lib
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* @modules java.base/jdk.internal.misc
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* java.management
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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:NativeMemoryTracking=summary -Xms32m -Xmx32m -Xint PeakMallocTest
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*
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*/
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// Note we run the test with -Xint to keep compilers from running and reduce malloc noise.
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import jdk.test.lib.process.OutputAnalyzer;
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import jdk.test.whitebox.WhiteBox;
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public class PeakMallocTest {
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private static WhiteBox wb = WhiteBox.getWhiteBox();
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private static final double FUDGE_FACTOR = 0.2;
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public static void main(String[] args) throws Exception {
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// Measure early malloc total and peak
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OutputAnalyzer output = NMTTestUtils.startJcmdVMNativeMemory("scale=1");
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long earlyTotal = getMallocTotal(output);
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long earlyPeak = getMallocPeak(output);
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System.out.println("Early malloc total: " + earlyTotal);
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System.out.println("Early malloc peak: " + earlyPeak);
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// Allocate a large amount of memory and then free
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long allocSize = Math.max(8 * earlyPeak, 250 * 1024 * 1024); // MAX(earlyPeak * 8, 250MB)
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long addr = wb.NMTMalloc(allocSize);
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System.out.println("Allocation size: " + allocSize);
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wb.NMTFree(addr);
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// Measure again
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output = NMTTestUtils.startJcmdVMNativeMemory("scale=1");
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long currTotal = getMallocTotal(output);
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long currPeak = getMallocPeak(output);
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System.out.println("Current malloc total: " + currTotal);
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System.out.println("Current malloc peak: " + currPeak);
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// Verify total global malloc is similar with a fudge factor
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double mallocLowerBound = earlyTotal * (1 - FUDGE_FACTOR);
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double mallocUpperBound = earlyTotal * (1 + FUDGE_FACTOR);
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if (currTotal < mallocLowerBound || currTotal > mallocUpperBound) {
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throw new Exception("Global malloc measurement is incorrect. " +
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"Expected range: [" + mallocLowerBound + " - " + mallocUpperBound + "]. " +
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"Actual malloc total: " + currTotal);
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}
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// Verify global malloc peak reflects large allocation with a fudge factor
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long peakDiff = currPeak - earlyPeak;
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double peakLowerBound = allocSize * (1 - FUDGE_FACTOR);
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double peakUpperBound = allocSize * (1 + FUDGE_FACTOR);
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if (peakDiff < peakLowerBound || peakDiff > peakUpperBound) {
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throw new Exception("Global malloc peak measurement is incorrect. " +
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"Expected peak diff range: [" + peakLowerBound + " - " + peakUpperBound + "]. " +
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"Actual peak diff: " + peakDiff);
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}
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}
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private static long getMallocPeak(OutputAnalyzer output) {
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// First match should correspond to global malloc peak
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String global = output.firstMatch("peak=\\d*");
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return Long.parseLong(global.substring(global.indexOf("=") + 1));
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}
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private static long getMallocTotal(OutputAnalyzer output) {
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// First match should correspond to global malloc total
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String global = output.firstMatch("malloc: \\d*");
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return Long.parseLong(global.substring(global.indexOf(" ") + 1));
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}
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}
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