Java performance tips

Question

I have a program I ported from C to Java. Both apps use quicksort to order some partitioned data (genomic coordinates).

The Java version runs fast, but I\'d like to get

Answer 1

Use a profiler:

• visualvm ( free, limited )
• jprofiler ( commercial )
• yourkit java profiler ( commercial )
• hprof ( free, limited, console only )

Use the latest version of JVM from your provider. Incidentally Sun's Java 6 update 14 does bring performance improvements.

Measure your GC throughput and pick the best garbage collector for your workload.