When measuring the Fast Fourier Transform (FFT) performance with Java, the fastest performance was exhibited using Sun's Java stack on Ubuntu 8.10. The official Java implementation was roughly 5% faster than OpenJDK on the same operating system, but both JVMs had outperformed the Java stack on Windows. Java on Ubuntu was about 30% faster than Windows Vista Premium.
The Successive Over Relaxation (SOR) performance with Java SciMark was also the fastest on Ubuntu. This time, however, the performance between OpenJDK and the official JVM on Ubuntu 8.10 was virtually the same. Java on Ubuntu was about 33% faster than with Microsoft Windows.