seaweedfs/weed/util/mem/slot_pool.go
2022-01-22 08:05:04 -08:00

55 lines
935 B
Go

package mem
import (
"github.com/chrislusf/seaweedfs/weed/glog"
"sync"
"sync/atomic"
)
var pools []*sync.Pool
const (
min_size = 1024
)
func bitCount(size int) (count int) {
for ; size > min_size; count++ {
size = (size + 1) >> 1
}
return
}
func init() {
// 1KB ~ 256MB
pools = make([]*sync.Pool, bitCount(1024*1024*256))
for i := 0; i < len(pools); i++ {
slotSize := 1024 << i
pools[i] = &sync.Pool{
New: func() interface{} {
buffer := make([]byte, slotSize)
return &buffer
},
}
}
}
func getSlotPool(size int) *sync.Pool {
index := bitCount(size)
return pools[index]
}
var total int64
func Allocate(size int) []byte {
newVal := atomic.AddInt64(&total, 1)
glog.V(4).Infof("++> %d", newVal)
slab := *getSlotPool(size).Get().(*[]byte)
return slab[:size]
}
func Free(buf []byte) {
newVal := atomic.AddInt64(&total, -1)
glog.V(4).Infof("--> %d", newVal)
getSlotPool(cap(buf)).Put(&buf)
}