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James Wilson
2021-07-21 13:59:44 +01:00
parent 999d8ff0bd
commit cedc2f9dbe
1 changed files with 2 additions and 2 deletions
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backend/telemetry_core/src/main.rs
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@@ -244,9 +244,9 @@ where
// has to wake up 100 times a second to poll things. If we have 1000 feeds, that's 100,000 waksups
// per second. Even without any work in the loop, that uses a lot of CPU.
//
// To combat this, we add a small wait to reduce how often the select loop can be woken up. We
// To combat this, we add a small wait to reduce how often the select loop will be woken up under high load. We
// buffer messages to feeds so that we do as much work as possible during each wakeup, and if the
// wakeup lasts longer than 75ms we don't wait before polling again. This knocks ~80% CPU usage
// wakeup lasts longer than 75ms we don't wait before polling again. This knocks ~80% of a CPU worth of usage
// off on my machine running a soak test with 500 feeds, 4 shards and 100 nodes, doesn't seem to impact
// memory usage much, and still ensures that messages are delivered in a timely fashion.
//