/
main.go
219 lines (209 loc) · 5.56 KB
/
main.go
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package main
import (
"fmt"
"io"
"math"
"os"
"path"
"sort"
"github.com/gholt/brimtext"
)
func main() {
if len(os.Args) != 2 {
fmt.Printf("%s <dir>\n", os.Args[0])
os.Exit(1)
}
dirCount, otherCount, fileSizes := dirWalk(os.Args[1], nil)
var fileSizesTotal int64
for _, s := range fileSizes {
fileSizesTotal += s
}
fileSizesMean := fileSizesTotal / int64(len(fileSizes))
var fileSizesMedian int64
if len(fileSizes) > 0 {
sort.Sort(fileSizes)
fileSizesMedian = fileSizes[len(fileSizes)/2]
}
report := [][]string{
{fmt.Sprintf("%d", dirCount), "directories"},
{fmt.Sprintf("%d", len(fileSizes)), "files"},
{fmt.Sprintf("%d", otherCount), "items not files nor directories"},
{fmt.Sprintf("%d", fileSizesTotal), "total file bytes"},
{fmt.Sprintf("%d", fileSizesMean), "mean file size"},
{fmt.Sprintf("%d", fileSizesMedian), "median file size"},
}
alignOptions := brimtext.NewDefaultAlignOptions()
alignOptions.Alignments = []brimtext.Alignment{brimtext.Right, brimtext.Left}
fmt.Println(brimtext.Align(report, alignOptions))
var blockSizesMean int64
var blockSizesMedian int64
var blockSizesCount int64
var blockSizesFull int64
var blockSizesTarget int64
blockSizesTarget = fileSizesMean
var blockSizes int64Slice
overshoot := true
for {
blockSizes = blockSizes[:0]
blockSizesFull = 0
for _, s := range fileSizes {
if s < 1 {
blockSizes = append(blockSizes, 0)
continue
}
for s >= blockSizesTarget {
blockSizes = append(blockSizes, blockSizesTarget)
s -= blockSizesTarget
blockSizesFull++
}
if s > 0 {
blockSizes = append(blockSizes, s)
}
}
blockSizesCount = int64(len(blockSizes))
blockSizesMean = fileSizesTotal / blockSizesCount
if blockSizesCount > 0 {
sort.Sort(blockSizes)
blockSizesMedian = blockSizes[blockSizesCount/2]
}
if blockSizesMedian > blockSizesMean && float64(blockSizesMedian-blockSizesMean)/float64(blockSizesMedian) < 0.01 {
if !overshoot {
break
}
if blockSizesTarget != math.MaxInt64 {
if blockSizesTarget > math.MaxInt64/2 {
blockSizesTarget = math.MaxInt64
} else {
blockSizesTarget *= 2
}
continue
}
}
overshoot = false
blockSizesTargetNew := blockSizesTarget - (blockSizesTarget-blockSizesMean+1)/2
if blockSizesTargetNew == blockSizesTarget {
break
}
blockSizesTarget = blockSizesTargetNew
}
report = [][]string{
{fmt.Sprintf("%d", blockSizesMean), "mean block size"},
{fmt.Sprintf("%d", blockSizesMedian), "median block size"},
{fmt.Sprintf("%d", blockSizesCount), "block count"},
{fmt.Sprintf("%d", blockSizesFull), fmt.Sprintf("full block count, %.0f%%", 100*float64(blockSizesFull)/float64(blockSizesCount))},
{fmt.Sprintf("%d", blockSizesTarget), "\"best\" block size, median~=mean"},
}
fmt.Println(brimtext.Align(report, alignOptions))
blockSizesTarget = math.MaxInt64
var blockSizesTargetHighCap int64
var blockSizesTargetLast int64
overshoot = true
done := false
for {
blockSizes = blockSizes[:0]
blockSizesFull = 0
for _, s := range fileSizes {
if s < 1 {
blockSizes = append(blockSizes, 0)
continue
}
for s >= blockSizesTarget {
blockSizes = append(blockSizes, blockSizesTarget)
s -= blockSizesTarget
blockSizesFull++
}
if s > 0 {
blockSizes = append(blockSizes, s)
}
}
blockSizesCount = int64(len(blockSizes))
blockSizesMean = fileSizesTotal / blockSizesCount
if blockSizesCount > 0 {
sort.Sort(blockSizes)
blockSizesMedian = blockSizes[blockSizesCount/2]
}
if done {
break
}
if float64(blockSizesFull)/float64(blockSizesCount) < 0.5 {
if !overshoot {
blockSizesTarget = blockSizesTargetLast
done = true
continue
}
blockSizesTargetHighCap = blockSizesTarget
blockSizesTarget /= 2
if blockSizesTarget < 1 {
blockSizesTarget = 1
done = true
}
continue
}
overshoot = false
blockSizesTargetNew := blockSizesTarget + (blockSizesTargetHighCap-blockSizesTarget+1)/2
if blockSizesTargetNew == blockSizesTarget {
break
}
blockSizesTargetLast = blockSizesTarget
blockSizesTarget = blockSizesTargetNew
}
report = [][]string{
{fmt.Sprintf("%d", blockSizesMean), "mean block size"},
{fmt.Sprintf("%d", blockSizesMedian), "median block size"},
{fmt.Sprintf("%d", blockSizesCount), "block count"},
{fmt.Sprintf("%d", blockSizesFull), fmt.Sprintf("full block count, %.0f%%", 100*float64(blockSizesFull)/float64(blockSizesCount))},
{fmt.Sprintf("%d", blockSizesTarget), "\"best\" block size, full~=50%"},
}
fmt.Println(brimtext.Align(report, alignOptions))
}
func dirWalk(dir string, fileSizes int64Slice) (int, int, int64Slice) {
dirCount := 1
otherCount := 0
f, err := os.Open(dir)
if err != nil {
fmt.Println(err)
return dirCount, otherCount, fileSizes
}
var subDirs []string
for {
fis, err := f.Readdir(100)
if err == io.EOF {
break
}
if err != nil {
fmt.Println(err)
f.Close()
break
}
for _, fi := range fis {
if fi.IsDir() {
subDirs = append(subDirs, fi.Name())
continue
}
if !fi.Mode().IsRegular() {
otherCount++
continue
}
fileSizes = append(fileSizes, fi.Size())
}
}
f.Close()
for _, subdir := range subDirs {
var subDirCount int
var subOtherCount int
subDirCount, subOtherCount, fileSizes = dirWalk(path.Join(dir, subdir), fileSizes)
dirCount += subDirCount
otherCount += subOtherCount
}
return dirCount, otherCount, fileSizes
}
type int64Slice []int64
func (s int64Slice) Len() int {
return len(s)
}
func (s int64Slice) Swap(a int, b int) {
s[a], s[b] = s[b], s[a]
}
func (s int64Slice) Less(a int, b int) bool {
return s[a] < s[b]
}