01 May '17, 1pm

Comparing Rails Performance on MRI 2.0, 2.1, 2.2, and 2.3:

Comparing Rails Performance on MRI 2.0, 2.1, 2.2, and 2.3:

There's a lot to those graphs. I'd summarize it as: the median request hasn't really gotten faster, but the 90th/95th/99th have gotten *much* faster, in some cases 2x or more. Yet another reason why "3 times faster" is hard to nail down. Memory usage (the red graph) has also gotten a bit higher. So we've traded more memory for more even response times. That sounds like a win to me. YMMV. Why hasn't the median request gotten faster in this benchmark? Hard to say. There may be a few optimizations that are included as backports that show up in the newer benchmark... But if so, not many. It's also possible that concurrent performance is better but straight-line sequential performance isn't. The default Discourse benchmark doesn't set "-c" for concurrency, so it's only checking one request at once. (Edited to add: Nate Berkopec points out that a lot of this is probably garbage ...

Full article: http://engineering.appfolio.com/appfolio-engineering/2017...

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