I have just finished performance and scalability testing of the combination of AMD64 Opteron, 64 bit JDK1.5.0 beta 3 and Linux 2.6 for AMD64 (Fedora Core 2).

The cpu, operating system and Java are thus all 64 bit.

The baseline system - Intel Xeon

• HP DL360
• Dual 3.06 Ghz
• JDK1.4.2

The AMD64 System

• HP DL145
• Dual 2.2 Ghz
• JDK1.5.0 beta 3 64 bit

Performance Testing

Test Application The test application was a J2EE application running on Orion application server. Tests results are measured in pages per second, using jBenchmark test scripts.

More than 40 different types of scripts were run.

Performance Results

The AMD 64 bit system was significantly faster in all tests where the limiting factor was not database performance.

Performance improvements ranged from 2.29 to 3.22 times more pages per second. In percentage terms that is 229% to 322% faster.

Maximum Number of Threads A new record of 32236 threads for thread-test.jar has been created!

The limiting factor is now memory. The 2GB process size limit is gone.

See the updated Establishing the Maximum Number of Threads article.