Grey Panthers Savannah

Category: profiler

  • Choosing a Java profiler

    Recently I’ve been looking around for a Java profiler (since the two things you need for a successful performance tuning session are good data and clear targets). I’ll share the notes about my findings in the hope that they might be useful for someone. Quick disclaimer: don’t believe everything you read on the Internet! These…

  • Don’t Yield to pressure?

    or: does Thread.yield have its place in todays Java programs? I was profiling a rather old legacy codebase (since the first rule of performance optimization is “profile it” with the close second of “have clear goals in mind” – but that’s an other post) and – after optimizing the first few hotspots, Thread.yield appeared at…

  • Profile first!

    I was using my code to parse a medium-sized CVS log and it was being slow (~1min). So, like an idiot I said: I know that the algorithm is quite slow, so I optimize it. Here is a version which is twice as fast as the original version: use strict; use warnings; use Test::More tests…