This section describes what is HotSpot - A Java VM (Virtual Machine) developed by Sun Microsystems.
What Is HotSpot?
Java HotSpot VM is developed by Sun Microsystems. It has key feature called adaptive
compiler that application code will be analyzed as it runs to detect performance
bottlenecks, or "hot spots". The Java HotSpot VM will then compile those hot spots
for a boost in performance.
There are two implementations of the Java HotSport VM:
Java HotSpot Client VM
Java HotSpot Server VM
The main differences of the two implementations are:
The Client VM has been specially tuned to reduce application start-up time
and memory footprint, making it particularly well suited for client environments.
The Server VM has been specially tuned to maximize peak operating speed.
It is intended for running long-running server applications, for which having the
fastest possible operating speed is generally more important than having the fastest
possible start-up time.
Both implementations of Java HotSpot VM are included inside the J2SDK installation
package. The next two sections will explain how to invoke them.
By the way, Java HotSpot VM source code is available at
http://www.sun.com/software/communitysource/hotspot/download.html
