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IBM developerWorks: Java, threads, and scheduling in Linux, Patching the kernel scheduler...

Jan 30, 2000, 16:16 (2 Talkback[s])
(Other stories by Ray Bryant, Bill Hartner)

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"This paper examines the performance of the Linux kernel when the system is running a Java program using the IBM Developer Kit for Linux, Java Technology Edition, Version 1.1.8. The Java program is the VolanoMark benchmark, a communication-intensive benchmark that creates a large number of Java threads. This implementation of the Java technology uses a native-threading model; each Java thread is supported by an underlying Linux process. Our measurements show that 20% or more of total system time spent running this benchmark is spent running the Linux kernel scheduler. We examine some simple modifications to the scheduler and their impact on the time spent in the scheduler. Finally, we suggest changes to the Linux kernel that may more effectively support applications of this type. In particular, the Linux scheduler needs to be modified to more efficiently support large numbers of processes, for which we offer a patch here. Additionally, we conclude that Linux kernel needs ultimately to be able to support a many-to-many threading model."

"One of the most common uses for Linux today is to provide an effective and load-tolerant platform for a Web server. When combined with Apache (or another Web server such as AOLServer), Linux can be the basis for a powerful and inexpensive Web server."

"Just as Linux is important for hosting Web servers, Java is an important component for building scalable, Web-based application servers. By writing the server-side applications in Java, you can move the application from platform to platform with relative ease."

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