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Merge pull request #13782 from colega/improve-stringlabels-compare 

Improve `Labels.Compare()` performance with `stringlabels`
This commit is contained in:
Björn Rabenstein 2024-03-19 18:29:32 +01:00 committed by GitHub
parent ac257aa071 d12e785075
commit 16164226e5
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
2 changed files with 14 additions and 6 deletions
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10
model/labels/labels_stringlabels.go
View File

@ -363,13 +363,11 @@ func Compare(a, b Labels) int {
// Now we know that there is some difference before the end of a and b.
// Go back through the fields and find which field that difference is in.
firstCharDifferent := i
for i = 0; ; {
size, nextI := decodeSize(a.data, i)
if nextI+size > firstCharDifferent {
break
}
firstCharDifferent, i := i, 0
size, nextI := decodeSize(a.data, i)
for nextI+size <= firstCharDifferent {
i = nextI + size
size, nextI = decodeSize(a.data, i)
}
// Difference is inside this entry.
aStr, _ := decodeString(a.data, i)

10
model/labels/labels_test.go
View File

@ -532,6 +532,16 @@ var comparisonBenchmarkScenarios = []struct {
FromStrings("aaa", "bbb", "ccc", "ddd", "eee", "fff", "ggg", "hhh", "iii", "jjj", "kkk", "lll", "mmm", "nnn", "ooo", "ppp", "qqq", "rrz"),
FromStrings("aaa", "bbb", "ccc", "ddd", "eee", "fff", "ggg", "hhh", "iii", "jjj", "kkk", "lll", "mmm", "nnn", "ooo", "ppp", "qqq", "rrr"),
},
{
"real long equal",
FromStrings("__name__", "kube_pod_container_status_last_terminated_exitcode", "cluster", "prod-af-north-0", " container", "prometheus", "instance", "kube-state-metrics-0:kube-state-metrics:ksm", "job", "kube-state-metrics/kube-state-metrics", " namespace", "observability-prometheus", "pod", "observability-prometheus-0", "uid", "d3ec90b2-4975-4607-b45d-b9ad64bb417e"),
FromStrings("__name__", "kube_pod_container_status_last_terminated_exitcode", "cluster", "prod-af-north-0", " container", "prometheus", "instance", "kube-state-metrics-0:kube-state-metrics:ksm", "job", "kube-state-metrics/kube-state-metrics", " namespace", "observability-prometheus", "pod", "observability-prometheus-0", "uid", "d3ec90b2-4975-4607-b45d-b9ad64bb417e"),
},
{
"real long different end",
FromStrings("__name__", "kube_pod_container_status_last_terminated_exitcode", "cluster", "prod-af-north-0", " container", "prometheus", "instance", "kube-state-metrics-0:kube-state-metrics:ksm", "job", "kube-state-metrics/kube-state-metrics", " namespace", "observability-prometheus", "pod", "observability-prometheus-0", "uid", "d3ec90b2-4975-4607-b45d-b9ad64bb417e"),
FromStrings("__name__", "kube_pod_container_status_last_terminated_exitcode", "cluster", "prod-af-north-0", " container", "prometheus", "instance", "kube-state-metrics-0:kube-state-metrics:ksm", "job", "kube-state-metrics/kube-state-metrics", " namespace", "observability-prometheus", "pod", "observability-prometheus-0", "uid", "deadbeef-0000-1111-2222-b9ad64bb417e"),
},
}
func BenchmarkLabels_Equals(b *testing.B) {