TrueCloudLab/frostfs-sdk-go
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[#236] netmap: Reuse slice for weights in ContainerNodes()

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```
goos: linux
goarch: amd64
pkg: git.frostfs.info/TrueCloudLab/frostfs-sdk-go/netmap
cpu: 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz
                                                              │    alloc     │               weights               │
                                                              │    sec/op    │    sec/op     vs base               │
Netmap_ContainerNodes/REP_2-8                                   8.677µ ±  6%   8.384µ ± 10%       ~ (p=0.247 n=10)
Netmap_ContainerNodes/REP_2_IN_X_CBF_2_SELECT_2_FROM_*_AS_X-8   7.946µ ± 14%   7.998µ ±  6%       ~ (p=0.481 n=10)
geomean                                                         8.303µ         8.189µ        -1.38%

                                                              │    alloc     │               weights               │
                                                              │     B/op     │     B/op      vs base               │
Netmap_ContainerNodes/REP_2-8                                   7.734Ki ± 0%   7.617Ki ± 0%  -1.52% (p=0.000 n=10)
Netmap_ContainerNodes/REP_2_IN_X_CBF_2_SELECT_2_FROM_*_AS_X-8   7.156Ki ± 0%   7.039Ki ± 0%  -1.64% (p=0.000 n=10)
geomean                                                         7.440Ki        7.322Ki       -1.58%

                                                              │   alloc    │              weights               │
                                                              │ allocs/op  │ allocs/op   vs base                │
Netmap_ContainerNodes/REP_2-8                                   92.00 ± 0%   77.00 ± 0%  -16.30% (p=0.000 n=10)
Netmap_ContainerNodes/REP_2_IN_X_CBF_2_SELECT_2_FROM_*_AS_X-8   92.00 ± 0%   77.00 ± 0%  -16.30% (p=0.000 n=10)
geomean                                                         92.00        77.00       -16.30%
```

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>
This commit is contained in:
Evgenii Stratonikov 2024-07-12 10:46:53 +03:00
parent 159a50fcf0
commit 6729f54c4e
2 changed files with 11 additions and 5 deletions
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12
netmap/netmap.go
View file

@ -113,9 +113,10 @@ func (n nodes) Hash() uint64 {
return 0
}
// weights returns slice of nodes weights W.
func (n nodes) weights(wf weightFunc) []float64 {
w := make([]float64, 0, len(n))
func (n nodes) appendWeightsTo(wf weightFunc, w []float64) []float64 {
if cap(w) < len(n) {
w = make([]float64, 0, len(n))
}
for i := range n {
w = append(w, wf(n[i]))
}
@ -149,10 +150,13 @@ func (m NetMap) PlacementVectors(vectors [][]NodeInfo, pivot []byte) ([][]NodeIn
wf := defaultWeightFunc(m.nodes)
result := make([][]NodeInfo, len(vectors))
var ws []float64
for i := range vectors {
result[i] = make([]NodeInfo, len(vectors[i]))
copy(result[i], vectors[i])
hrw.SortHasherSliceByWeightValue(result[i], nodes(result[i]).weights(wf), h)
ws = nodes(result[i]).appendWeightsTo(wf, ws[:0])
hrw.SortHasherSliceByWeightValue(result[i], ws, h)
}
return result, nil

4
netmap/selector.go
View file

@ -171,8 +171,10 @@ func (c *context) getSelectionBase(s netmap.Selector) []nodeAttrPair {
}
if len(c.hrwSeed) != 0 {
var ws []float64
for i := range result {
hrw.SortHasherSliceByWeightValue(result[i].nodes, result[i].nodes.weights(c.weightFunc), c.hrwSeedHash)
ws = result[i].nodes.appendWeightsTo(c.weightFunc, ws[:0])
hrw.SortHasherSliceByWeightValue(result[i].nodes, ws, c.hrwSeedHash)
}
}