PerformanceLogger

Class Overview

This class is intended to be a central place for the jdk to log timing events of interest. There is pre-defined event of startTime, as well as a general mechanism of setting aribtrary times in an array. All unreserved times in the array can be used by callers in application-defined situations. The caller is responsible for setting and getting all times and for doing whatever analysis is interesting; this class is merely a central container for those timing values. Note that, due to the variables in this class being static, use of particular time values by multiple applets will cause confusing results. For example, if plugin runs two applets simultaneously, the initTime for those applets will collide and the results may be undefined.

To automatically track startup performance in an app or applet, use the command-line parameter sun.perflog as follows:
-Dsun.perflog[=file:]
where simply using the parameter with no value will enable output to the console and a value of "file:" will cause that given filename to be created and used for all output.

By default, times are measured using System.currentTimeMillis(). To use System.nanoTime() instead, add the command-line parameter:
-Dsun.perflog.nano=true

Warning: Use at your own risk! This class is intended for internal testing purposes only and may be removed at any time. More permanent monitoring and profiling APIs are expected to be developed for future releases and this class will cease to exist once those APIs are in place.

Summary

[Expand] Inherited Methods

From class java.lang.Object Object clone() Creates and returns a copy of this object. boolean equals(Object obj) Indicates whether some other object is "equal to" this one. void finalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. final Class<?> getClass() Returns the runtime class of this Object. int hashCode() Returns a hash code value for the object. final void notify() Wakes up a single thread that is waiting on this object's monitor. final void notifyAll() Wakes up all threads that are waiting on this object's monitor. String toString() Returns a string representation of the object. final void wait() Causes the current thread to wait until another thread invokes the notify() method or the notifyAll() method for this object. final void wait(long timeout, int nanos) Causes the current thread to wait until another thread invokes the notify() method or the notifyAll() method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed. final void wait(long timeout) Causes the current thread to wait until either another thread invokes the notify() method or the notifyAll() method for this object, or a specified amount of time has elapsed.