hd zhou created FLINK-26705:
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Summary: use threadlocal to decrease ObjectSizeCalculator memory
use
Key: FLINK-26705
URL: https://issues.apache.org/jira/browse/FLINK-26705
Project: Flink
Issue Type: Improvement
Reporter: hd zhou
in class ObjectSizeCalculator
everytime call static function getObjectSize will new ObjectSizeCalculator,
cost much memory, Gc busy. use threadlocal will decrease memory use
{code:java}
/**
* Given an object, returns the total allocated size, in bytes, of the object
and all other objects reachable from it.
* Attempts to to detect the current JVM memory layout, but may fail with
{@link UnsupportedOperationException};
*
* @param obj the object; can be null. Passing in a {@link java.lang.Class}
object doesn't do anything special, it
* measures the size of all objects reachable through it (which will
include its class loader, and by
* extension, all other Class objects loaded by the same loader, and all
the parent class loaders). It doesn't
* provide the size of the static fields in the JVM class that the Class
object represents.
* @return the total allocated size of the object and all other objects it
retains.
* @throws UnsupportedOperationException if the current vm memory layout cannot
be detected.
*/
public static long getObjectSize(Object obj) throws
UnsupportedOperationException {
return obj == null ? 0 : new
ObjectSizeCalculator(CurrentLayout.SPEC).calculateObjectSize(obj);
} {code}
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