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Java Developer's Journal: JAVA 2, 1.3 Technology on the Linux Platform

Dec 02, 2000, 12:05 (1 Talkback[s])
(Other stories by Calvin Austin)

"The Java 2 Platform port was developed with the assistance of the blackdown.org porting group. Although Linux is a UNIX-based operating system, it's evolved at a different pace and direction than other UNIX platforms, making a port of the Java platform a sizable challenge. Many important bug fixes have gone into the Linux operating system and associated GNU libraries as a result of the work initiated by Blackdown, not just on Intel-based distributions but also Power PC and Sparc platforms. In particular, the linuxthreads library has improved dramatically over the past year on multiprocessor machines."

"This is the first release on Linux that includes the Java HotSpot Virtual Machine. Both the client and server Java HotSpot compilers are included by default in the Java Runtime Environment. These two solutions share the unique Java HotSpot runtime environment, but have different compilers optimized for the specific performance requirements of client- and server-side-based applications. The bundling of these virtual machines in one package provides developers with increased flexibility and convenience in deploying their client- or server-based Java technology applications."

"One major difference between developing on Linux and other UNIX operating systems is the system threads library. In Java 2 releases prior to 1.3, the JVM uses its own threads library, known as greenThreads, to implement threads in the Java platform. ... The downside to GreenThreads is that system threads on Linux are not taken advantage of, so the JVM doesn't scale well when additional CPUs are added. In J2SE Release 1.3, the HotSpot virtual machine uses Linux system threads to implement JavaThreads."

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