+++ /dev/null
-// Copyright 2014 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 main
-
-import (
- "fmt"
- "math"
-
- "golang.org/x/tools/benchmark/parse"
-)
-
-// BenchCmp is a pair of benchmarks.
-type BenchCmp struct {
- Before *parse.Benchmark
- After *parse.Benchmark
-}
-
-// Correlate correlates benchmarks from two BenchSets.
-func Correlate(before, after parse.Set) (cmps []BenchCmp, warnings []string) {
- cmps = make([]BenchCmp, 0, len(after))
- for name, beforebb := range before {
- afterbb := after[name]
- if len(beforebb) != len(afterbb) {
- warnings = append(warnings, fmt.Sprintf("ignoring %s: before has %d instances, after has %d", name, len(beforebb), len(afterbb)))
- continue
- }
- for i, beforeb := range beforebb {
- afterb := afterbb[i]
- cmps = append(cmps, BenchCmp{beforeb, afterb})
- }
- }
- return
-}
-
-func (c BenchCmp) Name() string { return c.Before.Name }
-func (c BenchCmp) String() string { return fmt.Sprintf("<%s, %s>", c.Before, c.After) }
-func (c BenchCmp) Measured(flag int) bool { return (c.Before.Measured & c.After.Measured & flag) != 0 }
-func (c BenchCmp) DeltaNsPerOp() Delta { return Delta{c.Before.NsPerOp, c.After.NsPerOp} }
-func (c BenchCmp) DeltaMBPerS() Delta { return Delta{c.Before.MBPerS, c.After.MBPerS} }
-func (c BenchCmp) DeltaAllocedBytesPerOp() Delta {
- return Delta{float64(c.Before.AllocedBytesPerOp), float64(c.After.AllocedBytesPerOp)}
-}
-func (c BenchCmp) DeltaAllocsPerOp() Delta {
- return Delta{float64(c.Before.AllocsPerOp), float64(c.After.AllocsPerOp)}
-}
-
-// Delta is the before and after value for a benchmark measurement.
-// Both must be non-negative.
-type Delta struct {
- Before float64
- After float64
-}
-
-// mag calculates the magnitude of a change, regardless of the direction of
-// the change. mag is intended for sorting and has no independent meaning.
-func (d Delta) mag() float64 {
- switch {
- case d.Before != 0 && d.After != 0 && d.Before >= d.After:
- return d.After / d.Before
- case d.Before != 0 && d.After != 0 && d.Before < d.After:
- return d.Before / d.After
- case d.Before == 0 && d.After == 0:
- return 1
- default:
- // 0 -> 1 or 1 -> 0
- // These are significant changes and worth surfacing.
- return math.Inf(1)
- }
-}
-
-// Changed reports whether the benchmark quantities are different.
-func (d Delta) Changed() bool { return d.Before != d.After }
-
-// Float64 returns After / Before. If Before is 0, Float64 returns
-// 1 if After is also 0, and +Inf otherwise.
-func (d Delta) Float64() float64 {
- switch {
- case d.Before != 0:
- return d.After / d.Before
- case d.After == 0:
- return 1
- default:
- return math.Inf(1)
- }
-}
-
-// Percent formats a Delta as a percent change, ranging from -100% up.
-func (d Delta) Percent() string {
- return fmt.Sprintf("%+.2f%%", 100*d.Float64()-100)
-}
-
-// Multiple formats a Delta as a multiplier, ranging from 0.00x up.
-func (d Delta) Multiple() string {
- return fmt.Sprintf("%.2fx", d.Float64())
-}
-
-func (d Delta) String() string {
- return fmt.Sprintf("Δ(%f, %f)", d.Before, d.After)
-}
-
-// ByParseOrder sorts BenchCmps to match the order in
-// which the Before benchmarks were presented to Parse.
-type ByParseOrder []BenchCmp
-
-func (x ByParseOrder) Len() int { return len(x) }
-func (x ByParseOrder) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
-func (x ByParseOrder) Less(i, j int) bool { return x[i].Before.Ord < x[j].Before.Ord }
-
-// lessByDelta provides lexicographic ordering:
-// * largest delta by magnitude
-// * alphabetic by name
-func lessByDelta(i, j BenchCmp, calcDelta func(BenchCmp) Delta) bool {
- iDelta, jDelta := calcDelta(i).mag(), calcDelta(j).mag()
- if iDelta != jDelta {
- return iDelta < jDelta
- }
- return i.Name() < j.Name()
-}
-
-// ByDeltaNsPerOp sorts BenchCmps lexicographically by change
-// in ns/op, descending, then by benchmark name.
-type ByDeltaNsPerOp []BenchCmp
-
-func (x ByDeltaNsPerOp) Len() int { return len(x) }
-func (x ByDeltaNsPerOp) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
-func (x ByDeltaNsPerOp) Less(i, j int) bool { return lessByDelta(x[i], x[j], BenchCmp.DeltaNsPerOp) }
-
-// ByDeltaMBPerS sorts BenchCmps lexicographically by change
-// in MB/s, descending, then by benchmark name.
-type ByDeltaMBPerS []BenchCmp
-
-func (x ByDeltaMBPerS) Len() int { return len(x) }
-func (x ByDeltaMBPerS) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
-func (x ByDeltaMBPerS) Less(i, j int) bool { return lessByDelta(x[i], x[j], BenchCmp.DeltaMBPerS) }
-
-// ByDeltaAllocedBytesPerOp sorts BenchCmps lexicographically by change
-// in B/op, descending, then by benchmark name.
-type ByDeltaAllocedBytesPerOp []BenchCmp
-
-func (x ByDeltaAllocedBytesPerOp) Len() int { return len(x) }
-func (x ByDeltaAllocedBytesPerOp) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
-func (x ByDeltaAllocedBytesPerOp) Less(i, j int) bool {
- return lessByDelta(x[i], x[j], BenchCmp.DeltaAllocedBytesPerOp)
-}
-
-// ByDeltaAllocsPerOp sorts BenchCmps lexicographically by change
-// in allocs/op, descending, then by benchmark name.
-type ByDeltaAllocsPerOp []BenchCmp
-
-func (x ByDeltaAllocsPerOp) Len() int { return len(x) }
-func (x ByDeltaAllocsPerOp) Swap(i, j int) { x[i], x[j] = x[j], x[i] }
-func (x ByDeltaAllocsPerOp) Less(i, j int) bool {
- return lessByDelta(x[i], x[j], BenchCmp.DeltaAllocsPerOp)
-}
projects / dotfiles / .git / blobdiff