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posted by martyb on Wednesday December 16 2015, @06:23AM   Printer-friendly
from the it-all-adds-up dept.

Okay, maybe not everything you know about latency is wrong. But now that I have your attention, we can talk about why the tools and methodologies you use to measure and reason about latency are likely horribly flawed. In fact, they're not just flawed, they're probably lying to your face.

When I went to Strange Loop in September, I attended a workshop called "Understanding Latency and Application Responsiveness" by Gil Tene. Gil is the CTO of Azul Systems, which is most renowned for its C4 pauseless garbage collector and associated Zing Java runtime. While the workshop was four and a half hours long, Gil also gave a 40-minute talk called "How NOT to Measure Latency" which was basically an abbreviated, less interactive version of the workshop. If you ever get the opportunity to see Gil speak or attend his workshop, I recommend you do. At the very least, do yourself a favor and watch one of his recorded talks or find his slide decks online.

The remainder of this [linked] post is primarily a summarization of that talk. You may not get anything out of it that you wouldn't get out of the talk, but I think it can be helpful to absorb some of these ideas in written form. Plus, for my own benefit, writing about them helps solidify it in my head.


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  • (Score: 2) by Hyperturtle on Wednesday December 16 2015, @11:05PM

    by Hyperturtle (2824) on Wednesday December 16 2015, @11:05PM (#277372)

    You're already modded high but I wanted to say that a) you referenced the time cube and b) +1

    Starting Score:    1  point
    Karma-Bonus Modifier   +1  

    Total Score:   2