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Log and README optimization for LowNodeUtilization

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lixiang
2021-02-20 11:52:02 +08:00
parent 6d0360fd16
commit e014fda58e
2 changed files with 8 additions and 14 deletions
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4
README.md
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@@ -176,7 +176,9 @@ the node is considered over utilized. Any node between the thresholds, `threshol
considered appropriately utilized and is not considered for eviction. The threshold, `targetThresholds`, considered appropriately utilized and is not considered for eviction. The threshold, `targetThresholds`,
can be configured for cpu, memory, and number of pods too in terms of percentage. can be configured for cpu, memory, and number of pods too in terms of percentage.
These thresholds, `thresholds` and `targetThresholds`, could be tuned as per your cluster requirements. These thresholds, `thresholds` and `targetThresholds`, could be tuned as per your cluster requirements. Note that this
strategy evicts pods from `overutilized nodes` (those with usage above `targetThresholds`) to `underutilized nodes`
(those with usage below `thresholds`), it will abort if any number of `underutilized nodes` or `overutilized nodes` is zero.
**Parameters:** **Parameters:**

18
pkg/descheduler/strategies/lownodeutilization.go
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@@ -115,32 +115,24 @@ func LowNodeUtilization(ctx context.Context, client clientset.Interface, strateg
klog.V(1).InfoS("Criteria for a node under utilization", klog.V(1).InfoS("Criteria for a node under utilization",
"CPU", thresholds[v1.ResourceCPU], "Mem", thresholds[v1.ResourceMemory], "Pods", thresholds[v1.ResourcePods]) "CPU", thresholds[v1.ResourceCPU], "Mem", thresholds[v1.ResourceMemory], "Pods", thresholds[v1.ResourcePods])
klog.V(1).InfoS("Number of underutilized nodes", "totalNumber", len(lowNodes))
klog.V(1).InfoS("Criteria for a node above target utilization",
"CPU", targetThresholds[v1.ResourceCPU], "Mem", targetThresholds[v1.ResourceMemory], "Pods", targetThresholds[v1.ResourcePods])
klog.V(1).InfoS("Number of overutilized nodes", "totalNumber", len(targetNodes))
if len(lowNodes) == 0 { if len(lowNodes) == 0 {
klog.V(1).InfoS("No node is underutilized, nothing to do here, you might tune your thresholds further") klog.V(1).InfoS("No node is underutilized, nothing to do here, you might tune your thresholds further")
return return
} }
klog.V(1).InfoS("Total number of underutilized nodes", "totalNumber", len(lowNodes))
if len(lowNodes) < strategy.Params.NodeResourceUtilizationThresholds.NumberOfNodes { if len(lowNodes) < strategy.Params.NodeResourceUtilizationThresholds.NumberOfNodes {
klog.V(1).InfoS("Number of nodes underutilized is less than NumberOfNodes, nothing to do here", "underutilizedNodes", len(lowNodes), "numberOfNodes", strategy.Params.NodeResourceUtilizationThresholds.NumberOfNodes) klog.V(1).InfoS("Number of nodes underutilized is less than NumberOfNodes, nothing to do here", "underutilizedNodes", len(lowNodes), "numberOfNodes", strategy.Params.NodeResourceUtilizationThresholds.NumberOfNodes)
return return
} }
if len(lowNodes) == len(nodes) {
klog.V(1).InfoS("All nodes are underutilized, nothing to do here")
return
}
if len(targetNodes) == 0 { if len(targetNodes) == 0 {
klog.V(1).InfoS("All nodes are under target utilization, nothing to do here") klog.V(1).InfoS("No node is overutilized, nothing to do here, you might tune your thresholds further")
return return
} }
klog.V(1).InfoS("Criteria for a node above target utilization",
"CPU", targetThresholds[v1.ResourceCPU], "Mem", targetThresholds[v1.ResourceMemory], "Pods", targetThresholds[v1.ResourcePods])
klog.V(1).InfoS("Number of nodes above target utilization", "totalNumber", len(targetNodes))
evictable := podEvictor.Evictable(evictions.WithPriorityThreshold(thresholdPriority)) evictable := podEvictor.Evictable(evictions.WithPriorityThreshold(thresholdPriority))
evictPodsFromTargetNodes( evictPodsFromTargetNodes(