Package org.apache.ivy.util
Class MemoryUtil
- java.lang.Object
-
- org.apache.ivy.util.MemoryUtil
-
public final class MemoryUtil extends java.lang.Object
Memory related utilities.
-
-
Field Summary
Fields Modifier and Type Field Description private static int
SAMPLING_SIZE
private static int
SLEEP_TIME
-
Constructor Summary
Constructors Modifier Constructor Description private
MemoryUtil()
-
Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description private static void
gc()
static long
getUsedMemory()
Returns the currently used memory, after calling garbage collector and waiting enough to get maximal chance it is actually called.static void
main(java.lang.String[] args)
static long
sizeOf(java.lang.Class<?> clazz)
Returns the approximate size of a default instance of the given class.
-
-
-
Field Detail
-
SAMPLING_SIZE
private static final int SAMPLING_SIZE
- See Also:
- Constant Field Values
-
SLEEP_TIME
private static final int SLEEP_TIME
- See Also:
- Constant Field Values
-
-
Method Detail
-
sizeOf
public static long sizeOf(java.lang.Class<?> clazz)
Returns the approximate size of a default instance of the given class.- Parameters:
clazz
- the class to evaluate.- Returns:
- the estimated size of instance, in bytes.
-
getUsedMemory
public static long getUsedMemory()
Returns the currently used memory, after calling garbage collector and waiting enough to get maximal chance it is actually called. But sinceRuntime.gc()
is only advisory, results returned by this method should be treated as rough approximation only.- Returns:
- the currently used memory, in bytes.
-
gc
private static void gc()
-
main
public static void main(java.lang.String[] args) throws java.lang.ClassNotFoundException
- Throws:
java.lang.ClassNotFoundException
-
-