agent/core: Implement LFC-aware scaling #1003
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Rebased onto main & squashed all commits -- merging left a lot of commits in the branch history. |
Omrigan
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Part of #872. This builds on the metrics that will be exposed by neondatabase/neon#8298. For now, we only look at the working set size metrics over various evenly-spaced windows (all 1 minute apart). The algorithm is somewhat straightforward to implement (see wss.go), but unfortunately seems to be difficult to understand *why* it's expected to work. For more context, refer to the RFC here: https://www.notion.so/neondatabase/cca38138fadd45eaa753d81b859490c6
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Omrigan
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Omrigan
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Part of #872.
This builds on the metrics that will be exposed by neondatabase/neon#8298.
For now, we only look at the working set size metrics over various time windows.
The algorithm is somewhat straightforward to implement (see wss.go), but unfortunately seems to be difficult to understand why it's expected to work.
See also: https://www.notion.so/neondatabase/cca38138fadd45eaa753d81b859490c6
Notes for review:
Currently just a draft, pending validation that this does behave as expected.Before merging, I want to:
Add some tests for LFC-based scaling tostate_test.go'sTest_DesiredResourcesFromMetricsOrRequestedUpscaling.Add some more tests inwss_test.goAdd some more comments explaining some of the weirder things (the new algorithm, whydesiredResourcesFromMetricsOrRequestedUpscalingnow needshasMetrics, etc.)As a follow-up, I'd like to resurrect #737 to make this cleaner. I have a WIP branch for that locally; figured it'd be easier to get this PR in first, and then tidy up.
Also, for now this PR builds on #929 for consistency with what's deployed on staging.