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Jeff McFadden

We turned on yjit in production today and the results feel impossible.

20-40% reduction in request times, with much less variability than we were seeing before.

This is incredible.

Between last week (Ruby 3.0) and this week (Ruby 3.2+yjit), our request times have been cut _in half_.

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Richard Schneeman

@mcphat that’s great. Is this a rails app or some other framework?

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Richard Schneeman

@mcphat neat! have you tried 3.2 with and without YJIT (I’m curious if the bump is more about 3.2 or YJIT)

Jeff McFadden

@Schneems Yep — we went 3.0 -> 3.2 (no jit) and let that run for a few days. That was a 20-30% performance improvement.

Then we turned on YJIT and got an _additional_ 20-40% boost on top.

Sep 16, 2023, 05:11 PM·Public·Ivory for Mac
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Johnathan Lyman

@mcphat @Schneems I’ve got four Rails apps under my watch on 3.0.5. You telling me there’s even a small chance I can 3.2+YJIT and send them through the roof?

I’m already thinking about the deprecation notices and I’m immediately less enthused.

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Jean Boussier

@johlym @mcphat @Schneems 3.0 -> 3.2 didn't deprecate much if anything. I think the biggest breaking change might be File.exists? that need to be changed to File.exist?

The somewhat "hard" one was 2.7 -> 3.0.

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Jeff McFadden

@byroot @johlym @Schneems Yea it wasn’t a particularly hard update for us. Some keyword arguments syntax updates in a few spots and a few gem updates. The tooling & deploy pipeline updates might have been the most work. But, even then, relatively easy. YMMV, of course.

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Johnathan Lyman

@mcphat @byroot @Schneems looking forward to the remaining 2014 idioms popping their heads up and squashing my false sense of confidence 😎

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