blob: 4f7bf52407ff067cd9a4efc6fda2b12c8d45794d [file] [log] [blame]
// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package benchproc
// NonSingularFields returns the subset of Fields for which at least two of keys
// have different values.
// This is useful for warning the user if aggregating a set of results has
// resulted in potentially hiding important configuration differences. Typically
// these keys are "residue" keys produced by ProjectionParser.Residue.
func NonSingularFields(keys []Key) []*Field {
// TODO: This is generally used on residue keys, but those might
// just have ".fullname" (generally with implicit exclusions).
// Telling the user that a set of benchmarks varies in ".fullname"
// isn't nearly as useful as listing out the specific subfields. We
// should synthesize "/N" subfields for ".fullname" for this (this
// makes even more sense if we make .fullname a group field that
// already has these subfields).
if len(keys) <= 1 {
// There can't be any differences.
return nil
var out []*Field
fields := commonProjection(keys).FlattenedFields()
for _, f := range fields {
base := keys[0].Get(f)
for _, k := range keys[1:] {
if k.Get(f) != base {
out = append(out, f)
return out