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News July 2018

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Watching Ionut Balosin's excellent JPrime talk "Architecting for performance" (see the articles section below) I was drawn to his article suggesting renaming non-functional requirements as "quality attributes" which I agree is so much better a name for performance, reliability, maintainability, etc. I wholeheartedly support that renaming!

His talk is also the only one I've seen apart from my own 2017 Devoxx talk to provide good guidelines on performance techniques that apply to specific response time ranges, and these are so nice that I'm going to extract them here:

Response time(Target name)AchievabilityTechniques
seconds(multi-second latency)easily achievablesmall methods, minimize branching, use cohesion, abstract cleanly
hundreds of milliseconds(sub-second latency)needs general performance tacticsas above plus: optimized data structures, algorithm complexity minimized, use batching and caching
tens of milliseconds(low latency)needs specific performance tacticsas above plus: memory access patterns optimized for CPU caches, lock free algorithms, asynchronous processing, stateless, RamFS/TmpFS, GC and object lifecycle tuning
under 1 millisecond(ultra-low latency)very specific techniques neededas above plus: thread affinity, NUMA, Large pages, avoid false sharing, data-oriented design, disable c-states, ensure CPU cache friendly operations, no GC, zero copy

Now on to our usual Java performance news section, tools, articles, talks. And of course the tips from this month's articles and talks, as ever are extracted into this month's tips page.

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Last Updated: 2018-10-29
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