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发信人: KHP (人之初), 信区: Java
标  题: JVM的加速引擎——Hotspot 1.0
发信站: BBS 水木清华站 (Mon Jul  5 15:44:36 1999)

ftp://166.111.163.77/develop/java/hotspot/

介绍如下：

The Java HotSpotTM performance engine is an add-on performance module for the
JavaTM 2 SDK. The Java HotSpot performance engine employs state-of-the-art
technology to offer many performance enhancements:

Adaptive compiler - The Java HotSpot performance engine launches an
application using a standard interpreter, but then analyzes the code as it
runs to detect performance bottlenecks, or "hot spots". It compiles those
performance-critical portions of the
code for a boost in performance, while avoiding unnecessary compilation of
seldom-used code (most of the program). The Java HotSpot performance engine
also uses the adaptive compiler to decide, on the fly, how best to optimize
compiled code with
techniques such as in-lining. The runtime analysis performed by the compiler
allows it to eliminate guesswork in determining which optimizations will
yield the largest performance benefit.

Improved garbage collection - The Java HotSpot performance engine
automatically reclaims ("garbage collects") memory used by software objects
that are no longer needed. The Java HotSpot performance engine includes a
state-of-the-art garbage collector
that is faster and more efficient than the garbage collector in the Java 2
SDK. As an option, the new garbage collector can operate in an "incremental"
mode which eliminates virtually all the program-execution pauses that are
typical of current garbage
collectors.

Thread synchronization - The Java programming language allows for use of
multiple, concurrent paths of program execution (called "threads"). The Java
HotSpot performance engine provides a leaner, speedier thread-handling
capability that is designed to
scale readily for use in large, shared-memory multiprocessor servers.

For more information about the architecture of the Java HotSpot performance
engine, see the whitepaper available on Sun's Java Software web site
(http://java.sun.com/products/hotspot).

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※ 修改:·KHP 於 Jul  5 15:46:25 修改本文·[FROM:  166.111.163.77]
※ 来源:·BBS 水木清华站 bbs.net.tsinghua.edu.cn·[FROM: 166.111.163.77]