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Federation Lag-o-meter (aftershock.lemmy.management)

submitted 1 year ago by hawkwind@lemmy.management to c/fediverse@lemmy.world

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I made this based on the gripe about some of the silent failures with federation. Might help users choose other servers. Might help admins troubleshoot. Open to comments and criticisms!

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[-] aleph@lemm.ee 9 points 1 year ago

When I saw the bar looking like the Burj Khalifa, I assumed it was .world instead of .ml. Interesting.

Props to Ruud@lemmy.world for dealing admirably with the Rexxit hug of death.

[-] nsfw_alt_2023@lemmynsfw.com 10 points 1 year ago* (last edited 1 year ago)

I’m expecting that JSON parsing is a huge overhead with the fediverse. I work on a SAAS that needs to do all its internal processing in under 10 ms, and serializing/deserializing ends up being a sizable chunk of server time. I saw a 40% reduction in runtime using simdjson for deserializing, and there exists a rust crate for it, but I haven’t had time to look the Lemmy code over.

Can anyone with an overloaded instance get on their command line and gather a decent flamegraph so the performance folks can aim optimizations in the right direction?

https://github.com/brendangregg/FlameGraph