scheduler: account for affinity value of zero in score normalization #25800
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
tgross
force-pushed
the
gh25621-zero-affinity
branch
from
50e964a to
ce15823
Compare
tgross
force-pushed
the
gh25621-zero-affinity
branch
from
ce15823 to
7bf0045
Compare
If there are no affinities on a job, we don't want to count an affinity score of zero in the number of scores we divide the normalized score by. This is how we handle other scoring components like node reschedule penalties on nodes that weren't running the previous allocation. But we also exclude counting the affinity in the case where we have affinity but the value is zero. In pathological cases, this can result in a node with a low affinity being picked over a node with no affinity, because the denominator is 1 larger. Include zero-value affinities in the count of scores if the job has affinities but the value just happens to be zero. Fixes: #25621
tgross
force-pushed
the
gh25621-zero-affinity
branch
from
7bf0045 to
483d52c
Compare
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Draft for discussion while I hunt down any side-effects
If there are no affinities on a job, we don't want to count an affinity score of zero in the number of scores we divide the normalized score by. This is how we handle other scoring components like node reschedule penalties on nodes that weren't running the previous allocation.
But we also exclude counting the affinity in the case where we have affinity but the value is zero. In pathological cases, this can result in a node with a no affinity being picked over a node with low affinity, because the denominator is 1 larger. Include zero-value affinities in the count of scores if the job has affinities but the value just happens to be zero.
Fixes: #25621