Java Memory Information getMemoryStatus(boolean preRunGarbageCollector)

Description

get Memory Status

License

Open Source License

Declaration

public static String getMemoryStatus(boolean preRunGarbageCollector) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

public class Main {
    public static String getMemoryStatus(boolean preRunGarbageCollector) {
        getRuntimeAndRunGC(preRunGarbageCollector);
        return "# Memory(MB): Total=" + getTotalMemory(false) + ", Used=" + getConsumedMemory(false) + ", Free="
                + getFreeMemory(false);/*from www  .ja  v a  2 s . c  o m*/
    }

    public static String getMemoryStatus() {
        return "# Memory(MB): MaxMem=" + getMaxMemory() + ", Used=" + getConsumedMemory(false);
    }

    private static Runtime getRuntimeAndRunGC(boolean preRunGarbageCollector) {
        Runtime rt = Runtime.getRuntime();
        if (preRunGarbageCollector) {
            //long startTime = System.currentTimeMillis();                               //DEBUG
            rt.gc();
            //System.out.println("GC takes "+(System.currentTimeMillis()-startTime)+" ms.");   //DEBUG
        }
        return rt;
    }

    public static long getTotalMemory(boolean preRunGarbageCollector) {
        Runtime rt = getRuntimeAndRunGC(preRunGarbageCollector);
        return bytesToMegabytes(rt.totalMemory());
    }

    public static long getTotalMemory() {
        return bytesToMegabytes(Runtime.getRuntime().totalMemory());
    }

    public static long getConsumedMemory(boolean preRunGarbageCollector) {
        Runtime rt = getRuntimeAndRunGC(preRunGarbageCollector);
        return bytesToMegabytes(rt.totalMemory() - rt.freeMemory());
    }

    public static long getFreeMemory(boolean preRunGarbageCollector) {
        Runtime rt = getRuntimeAndRunGC(preRunGarbageCollector);
        return bytesToMegabytes(rt.freeMemory());
    }

    public static long getMaxMemory() {
        return bytesToMegabytes(Runtime.getRuntime().maxMemory());
    }

    private static long bytesToMegabytes(long bytes) {
        long MEGABYTE = 1024L * 1024L;
        return bytes / MEGABYTE;
    }
}

Related

1. getMemoryInfo()
2. getMemoryLimit()
3. getMemoryLimitMinSize()
4. getMemoryStats()
5. getMemoryStats(int mode)
6. getMemoryString()
7. getMemoryString()
8. getMemoryUtilizationPercent()
9. getNowMemoryStatus()