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Ensure we balance across *all* NUMA nodes in NUMA distribution algo

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Signed-off-by: Kevin Klues <kklues@nvidia.com>
This commit is contained in:
Kevin Klues 2021-11-24 00:17:31 +00:00
parent c8559bc43e
commit 446c58e0e7
1 changed files with 10 additions and 7 deletions
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17
pkg/kubelet/cm/cpumanager/cpu_assignment.go
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@ -605,13 +605,16 @@ func takeByTopologyNUMADistributed(topo *topology.CPUTopology, availableCPUs cpu
} }
// Calculate how many CPUs will be available on each NUMA node in // Calculate how many CPUs will be available on each NUMA node in
// 'combo' after allocating an even distribution of CPU groups of // the system after allocating an even distribution of CPU groups
// size 'cpuGroupSize' from them. This will be used in the "balance // of size 'cpuGroupSize' from each NUMA node in 'combo'. This will
// score" calculation to help decide if this combo should // be used in the "balance score" calculation to help decide if
// ultimately be chosen. // this combo should ultimately be chosen.
availableAfterAllocation := make(mapIntInt, len(combo)) availableAfterAllocation := make(mapIntInt, len(numas))
for _, numa := range numas {
availableAfterAllocation[numa] = acc.details.CPUsInNUMANodes(numa).Size()
}
for _, numa := range combo { for _, numa := range combo {
availableAfterAllocation[numa] = acc.details.CPUsInNUMANodes(numa).Size() - distribution availableAfterAllocation[numa] -= distribution
} }
// Check if there are any remaining CPUs to distribute across the // Check if there are any remaining CPUs to distribute across the
@ -648,7 +651,7 @@ func takeByTopologyNUMADistributed(topo *topology.CPUTopology, availableCPUs cpu
} }
// Calculate the "balance score" as the standard deviation of // Calculate the "balance score" as the standard deviation of
// the number of CPUs available on all NUMA nodes in 'combo' // the number of CPUs available on all NUMA nodes in the system
// after the remainder CPUs have been allocated across 'subset' // after the remainder CPUs have been allocated across 'subset'
// in groups of size 'cpuGroupSize'. // in groups of size 'cpuGroupSize'.
balance := standardDeviation(availableAfterAllocation.Values()) balance := standardDeviation(availableAfterAllocation.Values())