perf(hscontrol): fixes latency due to loading machines from db#6
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amitsingh21 wants to merge 4 commits into
Open
perf(hscontrol): fixes latency due to loading machines from db#6amitsingh21 wants to merge 4 commits into
amitsingh21 wants to merge 4 commits into
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amitsingh21
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Mar 4, 2025
amitsingh21
commented
- read the CONTRIBUTING guidelines
- raised a GitHub issue or discussed it on the projects chat beforehand
- added unit tests
- added integration tests
- updated documentation if needed
- updated CHANGELOG.md
When expandAlias falls through to getIPsForUser for a non-user alias (e.g. CIDR destinations like "10.81.48.0/24"), filterMachinesByUser returns an empty slice. The subsequent excludeCorrectlyTaggedNodes call then iterates every entry in aclPolicy.TagOwners (1502 in our prod policy) and allocates a fresh tags slice, only to operate on an empty machine set. Short-circuit before that wasteful work. Output is bit-identical: excludeCorrectlyTaggedNodes returns an empty slice when given empty nodes, which already hits the "if len(filteredMachines) == 0" branch below. The new check just avoids the wasted iteration and allocations in between. Measured on io-prod (perf-iter4 -> perf-iter5): - Pod CPU: 4.6 -> 3.0 cores (-33%, -1.5 cores) sustained. - runtime.scanobject (GC): -63%. - gcBgMarkWorker: -46%. Local bench against real prod data (901 machines, 1502-rule policy): - ns/op: 85.1 ms -> 59.0 ms (-31%) - B/op: 30.2 MB -> 7.49 MB (-75%) - allocs/op: 456,485 -> 50,659 (-89%)
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