forked from TrueCloudLab/frostfs-sdk-go
[#227] netmap: Pre-calculate resulting slice capacity in flattenNodes
``` name old time/op new time/op delta ManySelects-12 17.5µs ±27% 15.5µs ±24% -11.57% (p=0.024 n=20+20) name old alloc/op new alloc/op delta ManySelects-12 9.03kB ± 0% 8.65kB ± 0% -4.25% (p=0.000 n=20+20) name old allocs/op new allocs/op delta ManySelects-12 86.0 ± 0% 82.0 ± 0% -4.65% (p=0.000 n=20+20) ``` Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
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1 changed files with 8 additions and 1 deletions
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@ -21,7 +21,14 @@ func NewNetmap(nodes Nodes) (*Netmap, error) {
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}
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func flattenNodes(ns []Nodes) Nodes {
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result := make(Nodes, 0, len(ns))
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var sz, i int
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for i = range ns {
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sz += len(ns[i])
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}
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result := make(Nodes, 0, sz)
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for i := range ns {
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result = append(result, ns[i]...)
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}
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