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perf: pre-allocate all known length arrays to avoid re-scaling (#5029)

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Co-authored-by: Kevin Wan <wanjunfeng@gmail.com>
This commit is contained in:
Ioannis Pinakoulakis
2025-08-08 19:03:25 +03:00
committed by GitHub
parent a2b98dbcf7
commit 130e1ba963
19 changed files with 29 additions and 28 deletions
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6
core/discov/internal/registry.go
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@@ -207,7 +207,7 @@ func (c *cluster) getCurrent(key watchKey) []KV {
return nil
}
var kvs []KV
kvs := make([]KV, 0, len(watcher.values))
for k, v := range watcher.values {
kvs = append(kvs, KV{
Key: k,
@@ -308,7 +308,7 @@ func (c *cluster) load(cli EtcdClient, key watchKey) int64 {
time.Sleep(coolDownUnstable.AroundDuration(coolDownInterval))
}
var kvs []KV
kvs := make([]KV, 0, len(resp.Kvs))
for _, ev := range resp.Kvs {
kvs = append(kvs, KV{
Key: string(ev.Key),
@@ -352,7 +352,7 @@ func (c *cluster) reload(cli EtcdClient) {
// cancel the previous watches
close(c.done)
c.watchGroup.Wait()
var keys []watchKey
keys := make([]watchKey, 0, len(c.watchers))
for wk, wval := range c.watchers {
keys = append(keys, wk)
if wval.cancel != nil {