Using JavaNws to Compare C and Java TCP-Socket Performance
Chandra Krintz and Rich Wolski
Abstract
As research and implementation continue to facilitate high performance
computing in Java, applications can benefit from
resource management and prediction tools. In this work, we present such a tool
for network round trip time and bandwidth between a user's desktop and any
machine running a web server~\footnote{This assumes
that the user's browser is capable of supporting Java 1.1 and above}.
JavaNws is a Java implementation and extension of a powerful subset
of the Network Weather Service (NWS), a
performance prediction toolkit that dynamically characterizes and forecasts the
performance available to an application. However, due to the Java language implementation
and functionality (portability, security, etc), it is unclear whether a Java program
is able to measure and predict the network performance experienced by
C-applications with the same accuracy as an equivalent C program.
We provide a quantitative equivalence study of the Java and C TCP-socket
interface and show that the data collected by the JavaNws is
as predictable as, that collected by the NWS (using C).