✨ Add a priority queue #3014
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✨ Add a priority queue #3014
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This was referenced Nov 17, 2024
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This change contains the POC of a priority workqueue that allows to prioritize events over one another. It is opt-in and will by default de-prioritize events originating from the initial listwatch and from periodic resyncs.
```
$ benchstat slice.txt btree.txt
goos: darwin
goarch: arm64
pkg: sigs.k8s.io/controller-runtime/pkg/controllerworkqueue
cpu: Apple M2 Pro
│ slice.txt │ btree.txt │
│ sec/op │ sec/op vs base │
AddGetDone-10 5.078m ± 0% 1.163m ± 0% -77.09% (p=0.000 n=10)
│ slice.txt │ btree.txt │
│ B/op │ B/op vs base │
AddGetDone-10 55.11Ki ± 0% 46.98Ki ± 0% -14.75% (p=0.000 n=10)
│ slice.txt │ btree.txt │
│ allocs/op │ allocs/op vs base │
AddGetDone-10 3.000k ± 0% 1.000k ± 0% -66.67% (p=0.000 n=10)
```
This reverts commit ce23de5. Speedup is tiny and at the expense of increased mem usage (which due to increasing GC pressure is likely the explanation why its so small), so doesn't seem worth it overall: ``` goos: darwin goarch: arm64 pkg: sigs.k8s.io/controller-runtime/pkg/controller/priorityqueue cpu: Apple M2 Pro │ blocking.txt │ non-blocking.txt │ │ sec/op │ sec/op vs base │ AddGetDone-10 1.320m ± 1% 1.410m ± 0% +6.81% (p=0.000 n=10) AddOnly-10 373.9µ ± 1% 343.2µ ± 1% -8.22% (p=0.000 n=10) AddLockContended-10 375.8µ ± 1% 342.8µ ± 1% -8.78% (p=0.000 n=10) geomean 570.3µ 549.4µ -3.66% │ blocking.txt │ non-blocking.txt │ │ B/op │ B/op vs base │ AddGetDone-10 109.9Ki ± 0% 164.2Ki ± 0% +49.42% (p=0.000 n=10) AddOnly-10 553.0 ± 2% 56045.0 ± 0% +10034.72% (p=0.000 n=10) AddLockContended-10 569.0 ± 6% 56045.0 ± 0% +9749.74% (p=0.000 n=10) geomean 3.207Ki 78.94Ki +2361.60% │ blocking.txt │ non-blocking.txt │ │ allocs/op │ allocs/op vs base │ AddGetDone-10 3.013k ± 0% 5.001k ± 0% +65.98% (p=0.000 n=10) AddOnly-10 16.00 ± 6% 2000.00 ± 0% +12400.00% (p=0.000 n=10) AddLockContended-10 16.00 ± 6% 2000.00 ± 0% +12400.00% (p=0.000 n=10) geomean 91.71 2.715k +2860.01% ```
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This change contains a priority workqueue that allows to prioritize events over one another. It is opt-in and will by default de-prioritize events originating from the initial listwatch and from periodic resyncs.
Ref #2374
Ref #3013
/hold