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package needle_map
import (
"fmt"
"log"
"os"
"runtime"
"testing"
"time"
. "github.com/chrislusf/seaweedfs/weed/storage/types"
)
/*
To see the memory usage:
go test -run TestMemoryUsage
The TotalAlloc section shows the memory increase for each iteration.
go test -run TestMemoryUsage -memprofile=mem.out
go tool pprof --alloc_space needle.test mem.out
*/
func TestMemoryUsage(t *testing.T) {
var maps []*CompactMap
totalRowCount := uint64(0)
startTime := time.Now()
for i := 0; i < 10; i++ {
indexFile, ie := os.OpenFile("../../../test/data/sample.idx", os.O_RDWR|os.O_RDONLY, 0644)
if ie != nil {
log.Fatalln(ie)
}
m, rowCount := loadNewNeedleMap(indexFile)
maps = append(maps, m)
totalRowCount += rowCount
indexFile.Close()
PrintMemUsage(totalRowCount)
now := time.Now()
fmt.Printf("\tTaken = %v\n", now.Sub(startTime))
startTime = now
}
}
func loadNewNeedleMap(file *os.File) (*CompactMap, uint64) {
m := NewCompactMap()
bytes := make([]byte, NeedleMapEntrySize)
rowCount := uint64(0)
count, e := file.Read(bytes)
for count > 0 && e == nil {
for i := 0; i < count; i += NeedleMapEntrySize {
rowCount++
key := BytesToNeedleId(bytes[i : i+NeedleIdSize])
offset := BytesToOffset(bytes[i+NeedleIdSize : i+NeedleIdSize+OffsetSize])
size := BytesToSize(bytes[i+NeedleIdSize+OffsetSize : i+NeedleIdSize+OffsetSize+SizeSize])
if !offset.IsZero() {
m.Set(NeedleId(key), offset, size)
} else {
m.Delete(key)
}
}
count, e = file.Read(bytes)
}
return m, rowCount
}
func PrintMemUsage(totalRowCount uint64) {
runtime.GC()
var m runtime.MemStats
runtime.ReadMemStats(&m)
// For info on each, see: https://golang.org/pkg/runtime/#MemStats
fmt.Printf("Each %.2f Bytes", float64(m.TotalAlloc)/float64(totalRowCount))
fmt.Printf("\tAlloc = %v MiB", bToMb(m.Alloc))
fmt.Printf("\tTotalAlloc = %v MiB", bToMb(m.TotalAlloc))
fmt.Printf("\tSys = %v MiB", bToMb(m.Sys))
fmt.Printf("\tNumGC = %v", m.NumGC)
}
func bToMb(b uint64) uint64 {
return b / 1024 / 1024
}
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