Automatic merge from submit-queue (batch tested with PRs 66291, 66471, 66499). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Improve unit test TestZeroRequest
**What this PR does / why we need it**:
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes#66468
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
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Extender preemption should respect IsInterested()
**What this PR does / why we need it**:
Extender preemption should respect IsInterested()
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes#66289
**Special notes for your reviewer**:
The bug is reported and the first commit is co-authored by: @chenchun
**Release note**:
```release-note
Extender preemption should respect IsInterested()
```
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Improve scheduler's performance by eliminating sorting of nodes by their score
**What this PR does / why we need it**:
Profiling scheduler, I noticed that scheduler spends a significant amount of time in sorting the nodes after we score them to find nodes with the highest score. Finding nodes with the highest score does not need sorting the array. This PR replaces the sort with a linear scan.
Eliminating the sort results in over 10% improvement in throughput of the scheduler.
Before (3 runs for 5000 nodes, scheduling 1000 pods in a cluster running 2000 pods):
BenchmarkScheduling/5000Nodes/2000Pods-12 1000 20682552 ns/op
BenchmarkScheduling/5000Nodes/2000Pods-12 1000 20464729 ns/op
BenchmarkScheduling/5000Nodes/2000Pods-12 1000 21188906 ns/op
After:
BenchmarkScheduling/5000Nodes/2000Pods-12 1000 18485866 ns/op
BenchmarkScheduling/5000Nodes/2000Pods-12 1000 18457749 ns/op
BenchmarkScheduling/5000Nodes/2000Pods-12 1000 18418200 ns/op
**Release note**:
```release-note
Improve scheduler's performance by eliminating sorting of nodes by their score.
```
Automatic merge from submit-queue (batch tested with PRs 65388, 64995). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Add more conditions to the list of predicate failures that won't be resolved by preemption
**What this PR does / why we need it**:
Adds more conditions to the list of predicate failures that won't be resolved by preemption. This change can potentially improve performance of preemption by avoiding the nodes that won't be able to schedule the pending pod no matter how many other pods are removed from them.
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #
**Special notes for your reviewer**:
**Release note**:
```release-note
Add more conditions to the list of predicate failures that won't be resolved by preemption.
```
/sig scheduling
This moves the equivalence cache implementation out of the 'core'
package and into k8s.io/kubernetes/pkg/scheduler/core/equivalence.
Separating the equiv. cache from the genericScheduler implementation
make their interaction points easier to follow, and prevents us from
accidentally accessing unexported fields.
Automatic merge from submit-queue (batch tested with PRs 64142, 64426, 62910, 63942, 64548). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
scheduler: further cleanup of equivalence cache
**What this PR does / why we need it**:
This improves comments and simplifies some names/logic in equivalence_cache.go, as well as changing the order of some items in the file.
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
/kind cleanup
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Remove unused parameter (pod) in `pkg/scheduler/core/generic_scheduler`
**What this PR does / why we need it**:
Remove unused parameter (pod) in `pkg/scheduler/core/generic_scheduler`
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
This makes the lookup behave like a normal map lookup, so it is easier
for readers to follow the logic. It also inverts the "invalid" bool to
an "ok" bool because `!invalid` is a double negative.
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Optimize the lock which in the RunPredicate
**What this PR does / why we need it**:
Enhance the performance of scheduler
- Change the lock in the RunPredicate from lock to rlock
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Could solve part of #63784
**Special notes for your reviewer**:
_Run benchmark test by scheduler_perf_:
`Before` BenchmarkScheduling/1000Nodes/0Pods-32 1000 11689758 ns/op
`After` BenchmarkScheduling/1000Nodes/0Pods-32 1000 5951510 ns/op
_Run integration (density) test by scheduler_perf_:
Schedule 3000 Pods On 3000 Nodes
`Before` rate 19 per second on average
`After` rate 58 per second on average
_Cpu profile test result_:
`Before` [click](https://cdn.rawgit.com/godliness/files/master/63784_before.svg)
`After` [click](https://cdn.rawgit.com/godliness/files/master/63784_after.svg)
**Release note**:
```release-note
`None`
```
/sig scheduling
/cc @misterikkit
/cc @bsalamat
/cc @ravisantoshgudimetla
/cc @resouer
Automatic merge from submit-queue (batch tested with PRs 64174, 64187, 64216, 63265, 64223). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Do not use DeepEqual to compare slices in test.
This wraps DeepEqual with a helper that considers nil slices and empty
slices to be equal.
Scheduler code might use a nil slice or empty slice to represent an
empty list, so tests should not be sensitive to the difference. Tests
could fail because DeepEqual considers nil to be different from an empty
slice.
**What this PR does / why we need it**:
Avoid breaking tests in cases where application behavior is not changed.
**Special notes for your reviewer**:
This brittle test keeps breaking in a number of my PRs. Hoping to get this fix merged independently.
**Release note**:
```release-note
NONE
```
/sig scheduling
/kind cleanup
This wraps DeepEqual with a helper that considers nil slices and empty
slices to be equal.
Scheduler code might use a nil slice or empty slice to represent an
empty list, so tests should not be sensitive to the difference. Tests
could fail because DeepEqual considers nil to be different from an empty
slice.
Automatic merge from submit-queue (batch tested with PRs 63283, 64032, 64159, 64126, 64098). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
remove unused code of (pkg/scheduler)
**What this PR does / why we need it**:
/kind cleanup
remove unused code
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
Automatic merge from submit-queue (batch tested with PRs 63598, 63913, 63459, 63963, 60464). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Check nodeInfo before ecache predicate
**What this PR does / why we need it**:
There's chances during test when nodeInfo is nil which may cause ecache predicate fail with nil pointer.
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes#63427
**Special notes for your reviewer**:
Not sure how to reproduce the original issue yet. i.e. why and when `nodeInfo` will become nil in tests is not clear to me, that's why I label it as WIP.
cc @bsalamat who may have more inputs.
**Release note**:
```release-note
NONE
```
This changes two methods in EquivalenceCache to be unexported, because
they should no longer be called by users of this type. (Even users in
the same package!)
The purpose of this map is to combine two predicate results before
writing to the equivalence cache. However, the branch that combines
results is unreachable.
1. Combining results happens in the second iteration of the outer loop.
2. There is only a second iteration when podsAdded is true.
3. We skip equiv. cache when podsAdded is true.
This method combines "lookup" and "update" into one operation. The
benefit is that this method call is very similar to running an ordinary
predicate, so callers can simplify their code.
Automatic merge from submit-queue (batch tested with PRs 62937, 63105, 63031, 63174). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Revert "Revert "Revert revert of equivalence class hash calculation i…
…n scheduler""
This reverts commit 4386751b5d.
**What this PR does / why we need it**:
This re-introduces the change from https://github.com/kubernetes/kubernetes/pull/58555 which changes how the scheduler computes equivalence classes of pods. I believe we have fixed the flakiness observed previously (https://github.com/kubernetes/kubernetes/issues/61512, https://github.com/kubernetes/kubernetes/issues/62921). I have run the test in question a few dozen times without a failure.
```bash
make test-integration WHAT="./test/integration/scheduler" KUBE_TEST_ARGS="-run TestPreemptionStarvation" GOFLAGS="-v"
```
/ref https://github.com/kubernetes/kubernetes/issues/58222
**Special notes for your reviewer**:
I had to resolve several merge conflicts. I think I resolved them correctly, but keep an eye out for anything silly.
**Release note**:
```release-note
NONE
```
/sig scheduling
Because the scheduler takes a snapshot of cache data at the start of
each scheduling cycle, updates to the equivalence cache should be
skipped if there was a cache update during the cycle.
If the current NodeInfo becomes stale while we evaluate predicates, we
will not write any results into the equivalence cache. We will still use
the results for the current scheduling cycle, though.
