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* Rework `needle_map.CompactMap()` to maximize memory efficiency. * Use a memory-efficient structure for `CompactMap` needle value entries. This slightly complicates the code, but makes a **massive** difference in memory efficiency - preliminary results show a ~30% reduction in heap usage, with no measurable performance impact otherwise. * Clean up type for `CompactMap` chunk IDs. * Add a small comment description for `CompactMap()`. * Add the old version of `CompactMap()` for comparison purposes.
94 lines
2.0 KiB
Go
94 lines
2.0 KiB
Go
package needle_map
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import (
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"fmt"
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"log"
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"os"
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"runtime"
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"testing"
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"time"
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. "github.com/seaweedfs/seaweedfs/weed/storage/types"
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)
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/*
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To see the memory usage:
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go test -run TestMemoryUsage
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The Alloc section shows the in-use memory increase for each iteration.
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go test -run TestMemoryUsage -memprofile=mem.out
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go tool pprof --alloc_space needle.test mem.out
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*/
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func TestMemoryUsage(t *testing.T) {
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var maps []*CompactMap
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totalRowCount := uint64(0)
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startTime := time.Now()
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for i := 0; i < 10; i++ {
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indexFile, ie := os.OpenFile("../../../test/data/sample.idx", os.O_RDWR|os.O_RDONLY, 0644)
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if ie != nil {
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log.Fatalln(ie)
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}
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m, rowCount := loadNewNeedleMap(indexFile)
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maps = append(maps, m)
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totalRowCount += rowCount
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indexFile.Close()
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PrintMemUsage(totalRowCount)
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now := time.Now()
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fmt.Printf("\tCompactMap = %s", m.String())
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fmt.Printf("\tTaken = %v\n", now.Sub(startTime))
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startTime = now
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}
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}
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func loadNewNeedleMap(file *os.File) (*CompactMap, uint64) {
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m := NewCompactMap()
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bytes := make([]byte, NeedleMapEntrySize)
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rowCount := uint64(0)
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count, e := file.Read(bytes)
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for count > 0 && e == nil {
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for i := 0; i < count; i += NeedleMapEntrySize {
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rowCount++
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key := BytesToNeedleId(bytes[i : i+NeedleIdSize])
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offset := BytesToOffset(bytes[i+NeedleIdSize : i+NeedleIdSize+OffsetSize])
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size := BytesToSize(bytes[i+NeedleIdSize+OffsetSize : i+NeedleIdSize+OffsetSize+SizeSize])
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if !offset.IsZero() {
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m.Set(NeedleId(key), offset, size)
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} else {
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m.Delete(key)
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}
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}
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count, e = file.Read(bytes)
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}
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return m, rowCount
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}
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func PrintMemUsage(totalRowCount uint64) {
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runtime.GC()
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var m runtime.MemStats
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runtime.ReadMemStats(&m)
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// For info on each, see: https://golang.org/pkg/runtime/#MemStats
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fmt.Printf("Each %.02f Bytes", float64(m.Alloc)/float64(totalRowCount))
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fmt.Printf("\tAlloc = %v MiB", bToMb(m.Alloc))
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fmt.Printf("\tTotalAlloc = %v MiB", bToMb(m.TotalAlloc))
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fmt.Printf("\tSys = %v MiB", bToMb(m.Sys))
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fmt.Printf("\tNumGC = %v", m.NumGC)
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}
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func bToMb(b uint64) uint64 {
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return b / 1024 / 1024
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}
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