Java Utililty Methods Memory Information

List of utility methods to do Memory Information

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Description

The list of methods to do Memory Information are organized into topic(s).

Method

voidprintMemory()
print Memory 
int mb = 1024 * 1024;
Runtime runtime = Runtime.getRuntime();
System.out.println("##### Heap utilization statistics [MB] #####");
System.out.println("Used Memory:" + (runtime.totalMemory() - runtime.freeMemory()) / mb);
System.out.println("Free Memory:" + runtime.freeMemory() / mb);
System.out.println("Total Memory:" + runtime.totalMemory() / mb);
System.out.println("Max Memory:" + runtime.maxMemory() / mb);
voidprintMemory(String label)
print Memory 
System.out.println(label);
Runtime rt = Runtime.getRuntime();
System.out.println("  Total memory: " + rt.totalMemory());
System.out.println("  Free memory:  " + rt.freeMemory());
System.out.println("  Max memory:   " + rt.maxMemory());
voidprintMemory(String str)
print Memory 
long total = Runtime.getRuntime().totalMemory();
long free = Runtime.getRuntime().freeMemory();
long used = total - free;
System.out.println("MEM  " + str + "    used: " + (used / 1024) + " KB    delta: "
        + ((used - lastMemUsed) / 1024) + " KB");
lastMemUsed = used;
voidprintMemoryInfo()
Print memory info 
Runtime currRuntime = Runtime.getRuntime();
int nFreeMemory = (int) (currRuntime.freeMemory() / 1024 / 1024);
int nTotalMemory = (int) (currRuntime.totalMemory() / 1024 / 1024);
String message = nFreeMemory + "M/" + nTotalMemory + "M(free/total)";
System.out.println("memory:" + message);
voidprintMemoryInstruction(byte[] instruction)
print Memory Instruction 
for (int i = 0; i < instruction.length; i++) {
    System.out.print(
            String.format("%8s", Integer.toBinaryString(instruction[i] & 0xff)).replace(' ', '0') + " ");
    if (i % 4 == 3)
        System.out.println();
voidshowMemory()
show Memory 
System.out.println("free: " + Runtime.getRuntime().freeMemory() / 1000000.0 + " MB");
System.out.println("max: " + Runtime.getRuntime().maxMemory() / 1000000.0 + " MB");
System.out.println("total: " + Runtime.getRuntime().totalMemory() / 1000000.0 + " MB");
System.out.println();
voidshowMemoryInfo()
show Memory Info 
final Runtime runtime = Runtime.getRuntime();
final long maxMemory = runtime.maxMemory();
final long allocatedMemory = runtime.totalMemory();
final long freeMemory = runtime.freeMemory();
System.out.println("------------------------------------------------------");
System.out.println("free memory: " + (freeMemory / 1024.0 / 1024.0) + " Mb");
System.out.println("allocated memory: " + (allocatedMemory / 1024.0 / 1024.0) + " Mb");
System.out.println("max memory: " + (maxMemory / 1024.0 / 1024.0) + " Mb");
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