Keith Lea has performed a benchmark between G plus plus (GCC) 3.3.1 20030930 (with glibc 2.3.2-98) for the C plus plus, with the -O2 flag (for both i386 and i686). He compiled the Java code normally with the Sun Java 1.4.2_01 compiler, and ran it with the Sun 1.4.2_01 JVM. He ran the tests on Red Hat Linux 9 / Fedora Test1 with the 2.4.20-20.9 kernel on a T30 laptop. The laptop "has a Pentium 4 mobile chip, 512MB of memory, a sort of slow disk," he notes.

More info @ http://kano.net/javabench/