tidb size 代码
文件路径：/util/size/size.go
/ Copyright 2022 PingCAP, Inc.
/
/ Licensed under the Apache License, Version 2.0 (the "License");
/ you may not use this file except in compliance with the License.
/ You may obtain a copy of the License at
/
/ http://www.apache.org/licenses/LICENSE-2.0
/
/ Unless required by applicable law or agreed to in writing, software
/ distributed under the License is distributed on an "AS IS" BASIS,
/ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
/ See the License for the specific language governing permissions and
/ limitations under the License.
package size
import "unsafe"
const (
/ KB is the kilobytes.
KB = uint64(1024)
/ MB is the megabytes.
MB = KB * 1024
/ GB is the gigabytes.
GB = MB * 1024
/ TB is the terabytes.
TB = GB * 1024
/ PB is the petabytes.
PB = TB * 1024
)
/ below constants are the size of commonly used types, for memory trace
const (
/ SizeOfSlice is the memory itself used, excludes the elements' memory
SizeOfSlice = int64(unsafe.Sizeof(*new([]int)))
/ SizeOfByte is the memory each byte occupied
SizeOfByte = int64(unsafe.Sizeof(*new(byte)))
/ SizeOfString is the memory string itself occupied
SizeOfString = int64(unsafe.Sizeof(*new(string)))
/ SizeOfBool is the memory each bool occupied
SizeOfBool = int64(unsafe.Sizeof(*new(bool)))
/ SizeOfPointer is the memory each pointer occupied
SizeOfPointer = int64(unsafe.Sizeof(new(int)))
/ SizeOfInterface is the memory each interface occupied, exclude the real type memory usage
SizeOfInterface = int64(unsafe.Sizeof(*new(interface{})))
/ SizeOfFloat64 is the memory each float64 occupied
SizeOfFloat64 = int64(unsafe.Sizeof(*new(float64)))
/ SizeOfUint64 is the memory each uint64 occupied
SizeOfUint64 = int64(unsafe.Sizeof(*new(uint64)))
/ SizeOfInt32 is the memory each int32 occupied
SizeOfInt32 = int64(unsafe.Sizeof(*new(int32)))
/ SizeOfInt is the memory each int occupied
SizeOfInt = int64(unsafe.Sizeof(*new(int)))
/ SizeOfUint8 is the memory each uint8 occupied
SizeOfUint8 = int64(unsafe.Sizeof(*new(uint8)))
)