The Java HotSpot
Performance Engine is set to break new records - JavaWorld
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The Java HotSpot Performance Engine is set to break new records
The Java HotSpot Performance Engine is set to break new records
By: By Paul Philion
Sun is setting the performance bar even higher with big plans for HotSpot
his
year's JavaOne conference featured a number of exciting
announcements pertaining to Sun's Java HotSpot Performance Engine
technology. HotSpot is Sun's advanced Java technology runtime
environment that uses arcane computational techniques to achieve better
performance than any other Java VM or just-in-time compiler (JIT)
available today. Real-world application testing has shown that the
HotSpot engine can double performance for server-side,
compute-intensive applications. The SPECjvm98 results speak for
themselves:
The Java HotSpot Performance Engine uses several techniques to achieve
these performance gains: adaptive optimization; efficient memory
management; and fast synchronization. Adaptive optimization involves
profiling the Java bytecode while it is running and picking out the
"hot spots" that will offer the best performance improvements when
optimized. Memory in the HotSpot engine VM is more carefully managed
than in the standard VM; object allocation occurs much faster and a new
pauseless garbage collector has been implemented using three collection
algorithms that are optimal for different memory-usage patterns.
Further, Sun has developed ways to lower the cost of object
synchronization, making multithreaded operation much more efficient.
For in-depth details of the HotSpot technology, refer to the
href="#resources">Resources section.
David Stoutamire,
Development Manager,
Sun Microsystems.
(Photo by Erik Wood.)
Even though the HotSpot engine was released less then two months ago,
Sun is already announcing new enhancements to the technology. Sun has
released HotSpot for Solaris; committed to releasing the HotSpot engine
under its Java Community Source program; and announced the
new-and-improved Java HotSpot Performance Engine 2.0. Further, Sun has
announced that HotSpot technologies will be included in the next
release of the Java 2 Platform, Standard Edition (J2SE).
Sreeram Duvvuru,
Development Manager,
HotSpot on SPARC/Solaris.
(Photo by Erik Wood.)
HotSpot engine released for Solaris
When the HotSpot engine was released in April at the Java Enterprise
Solutions Seminar (JESS) in Paris, it was available only for the Intel
platform. On June 16, during the HotSpot technology session at the
JavaOne Developer Conference, Sun announced the availability of the
engine for the Solaris platform. It can now be downloaded from the
HotSpot Web site (see Resources ). This version
brings the HotSpot performance improvements to the Solaris platform and
can be plugged directly into existing Java applications with no
changes.
HotSpot Community Source Licensing
On June 15, Sun formally announced that HotSpot 1.0 will be released
under the Sun Community Source Licensing program, or SCSL (see
href="#resources">Resources ) on August 1, 1999. This program
provides open access to Sun source code to encourage innovation for new
technologies. Releasing the HotSpot engine under the SCSL program will
allow anyone to peek under the covers and play with the technologies
that make it screamingly fast. Further, the whole community --
including those select few who have multiple advanced degrees in
tweaking the last drop of performance out of a runtime system -- will
be able to contribute to making the HotSpot engine even faster.
HotSpot engine 2.0
Also announced at the JavaOne event this year was the Java HotSpot
Performance Engine 2.0. This new, improved version of the HotSpot
engine will sport a 30 percent performance improvement over the classic
1.0 version, which is a whopping 260 percent faster than the Java 2
Platform, Standard Edition. While impressive, the improvements are
limited to server-side applications: The 2.0 version of the HotSpot
technology is intended specifically as a server-side solution. The
final release of this version will not be available until the fourth
quarter of 1999, but the early access version will be released in
August.
Client-side HotSpot technology
For those who may wonder, all is not lost on the client side of Java
technology. The next release of the Java 2 Platform, Standard Edition
(J2SE) will include more general-purpose performance improvements to
supercharge client-side performance. "Kestrel" -- the code name for the
next Java platform release, due in March 2000 -- will include several
of the HotSpot technologies. The Kestrel runtime environment will
include the HotSpot engine pauseless garbage collection, faster startup
time, and smaller memory footprint. The pauseless garbage collection to
be included in Kestrel is especially important for client-side human
interfaces. In current Java 2 platform applications, garbage collection
makes simple operations slow and sluggish.
All in all, the Java HotSpot Performance Engine looks like a real
winner. Alan Baratz, president of the Sun Java Software Division,
promises to "take this technology to even higher performance levels."
You can download it from Sun today, for free.
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