perf: preallocate GroupID #2441
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danxmoran
approved these changes
Dec 2, 2020
| @@ -87,6 +87,17 @@ func ToGroupID(name string, tags map[string]string, dims Dimensions) GroupID { | |||
| return NilGroup | |||
| } | |||
| var buf strings.Builder | |||
| l := 0 | |||
| if dims.ByName { | |||
| l += len(name) + 1 | |||
There was a problem hiding this comment.
I was confused about why these values were used until I looked below at the WriteString / WriteRune calls. Would it be overkill to add comments here that show the corresponding values added to buf? i.e.:
if dims.ByName {
// add capacity for (name + \n)
l += len(name) + 1
}better comments around peallocating GroupID
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