You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 

63 lines
1.1 KiB

package mem
import (
"github.com/seaweedfs/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, bool) {
index := bitCount(size)
if index >= len(pools) {
return nil, false
}
return pools[index], true
}
var total int64
func Allocate(size int) []byte {
if pool, found := getSlotPool(size); found {
newVal := atomic.AddInt64(&total, 1)
glog.V(4).Infof("++> %d", newVal)
slab := *pool.Get().(*[]byte)
return slab[:size]
}
return make([]byte, size)
}
func Free(buf []byte) {
if pool, found := getSlotPool(cap(buf)); found {
newVal := atomic.AddInt64(&total, -1)
glog.V(4).Infof("--> %d", newVal)
pool.Put(&buf)
}
}