The joys of a nice skewed profile. Ahhh…. :-) Of course, the ones you don’t notice, the flat profiles, are in some ways more insidious, as they drag everything down just a bit. Along with all the other things that drag everything down a bit, and soon enough you have something that’s 10% or 2x or 10x slower than it needs to be and no obvious culprits.Yes, this is definitely a problem, and an unsolvable one at that.
Not necessarily. Recently, on IBM z/Architecture platform, some JNI code I wrote ended up showing a bunch of unremarkable flat profiles when captured with hardware instrumentation at various intervals. Looking for any possible performance improvements, I examined the code associated with each unremarkable profile, and found some routines that were being called unnecessarily (returned after a quick condition check); when the logic was changed so as to avoid the checks (which was quite unobviously called from a loop) there was a 40% improvement in CPU performance. You might be surprised what you can find by looking at those flat profiles.
Paul
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