Java Memory Information getRuntimeMemoryStats()

Description

Get stringified runtime memory stats

License

Apache License

Return

String of all Runtime stats.

Declaration

public static String getRuntimeMemoryStats() 

Method Source Code

//package com.java2s;
/*//from w w w .  j a va2  s. c  o  m
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class Main {
    /**
     * Get stringified runtime memory stats
     *
     * @return String of all Runtime stats.
     */
    public static String getRuntimeMemoryStats() {
        return String.format("Memory (free/total/max) = %.2fM / %.2fM / %.2fM", freeMemoryMB(), totalMemoryMB(),
                maxMemoryMB());
    }

    /**
     * Get free memory in megabytes
     * @return free memory in megabytes
     */
    public static double freeMemoryMB() {
        return megaBytes(Runtime.getRuntime().freeMemory());
    }

    /**
     * Get total memory in megabytes
     * @return total memory in megabytes
     */
    public static double totalMemoryMB() {
        return megaBytes(Runtime.getRuntime().totalMemory());
    }

    /**
     * Get maximum memory in megabytes
     * @return maximum memory in megabytes
     */
    public static double maxMemoryMB() {
        return megaBytes(Runtime.getRuntime().maxMemory());
    }

    /**
     * Helper to compute megabytes
     * @param bytes integer number of bytes
     * @return megabytes
     */
    private static double megaBytes(long bytes) {
        return bytes / 1024.0 / 1024.0;
    }
}

Related

1. getMemoryStatus(boolean preRunGarbageCollector)
2. getMemoryString()
3. getMemoryString()
4. getMemoryUtilizationPercent()
5. getNowMemoryStatus()
6. getRuntimeMemoryStats()
7. getSummaryMemoryReportHeader()
8. getTotalMemoryStringInMb()
9. parseMemory(String s, int def)