calculate Memory Usage - Java Java Virtual Machine

Java examples for Java Virtual Machine:Memory

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Description

calculate Memory Usage

Demo Code


//package com.java2s;

public class Main {
    public static String calculateMemoryUsage() {
        //First initiate a garbage collection
        System.gc();//from w  w  w  . ja  v a  2 s.com

        //Calculate memory usage
        long totalMem = Runtime.getRuntime().totalMemory();
        long usedMem = totalMem - Runtime.getRuntime().freeMemory();

        //Calculate how to display size
        int depth;
        for (depth = 0; usedMem / 1024L > 1L && totalMem > 9999L
                && depth < 4; depth++) {
            usedMem /= 1024L;
            totalMem /= 1024L;
        }

        String postSize;
        switch (depth) {
        case 0: // '\0'
            postSize = "B";
            break;

        case 1: // '\001'
            postSize = "KB";
            break;

        case 2: // '\002'
            postSize = "MB";
            break;

        case 3: // '\003'
            postSize = "GB";
            break;

        case 4: // '\004'
        default:
            postSize = "TB";
            break;
        }

        return "Memory usage: " + usedMem + postSize + " of " + totalMem
                + postSize;
    }
}

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