/*
* Copyright ( c ) 2020 , 2022 , 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 .
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*/
package gc.z;
/**
* @ test TestMemoryMXBean
* @ requires vm . gc . Z
* @ summary Test ZGC heap memory MXBean
* @ modules java . management
* @ run main / othervm - XX : + UseZGC - Xms128M - Xmx256M - Xlog : gc * gc . z . TestMemoryMXBean 128 256
* @ run main / othervm - XX : + UseZGC - Xms256M - Xmx256M - Xlog : gc * gc . z . TestMemoryMXBean 256 256
*/
import java.lang.management.ManagementFactory;
public class TestMemoryMXBean {
public static void main(String[] args) throws Exception {
final long M = 1024 * 1024 ;
final long expectedInitialCapacity = Long .parseLong(args[0 ]) * M;
final long expectedMaxCapacity = Long .parseLong(args[1 ]) * M;
final var memoryUsage = ManagementFactory.getMemoryMXBean().getHeapMemoryUsage();
final long initialCapacity = memoryUsage.getInit();
final long capacity = memoryUsage.getCommitted();
final long maxCapacity = memoryUsage.getMax();
System.out.println("expectedInitialCapacity: " + expectedInitialCapacity);
System.out.println(" expectedMaxCapacity: " + expectedMaxCapacity);
System.out.println(" initialCapacity: " + initialCapacity);
System.out.println(" capacity: " + capacity);
System.out.println(" maxCapacity: " + maxCapacity);
if (initialCapacity != expectedInitialCapacity) {
throw new Exception("Unexpected initial capacity" );
}
if (maxCapacity != expectedMaxCapacity) {
throw new Exception("Unexpected max capacity" );
}
if (capacity < initialCapacity || capacity > maxCapacity) {
throw new Exception("Unexpected capacity" );
}
}
}
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