79 lines
2.4 KiB
Go
79 lines
2.4 KiB
Go
// Copyright 2022 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package size
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import "unsafe"
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const (
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// KB is the kilobytes.
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KB = uint64(1024)
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// MB is the megabytes.
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MB = KB * 1024
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// GB is the gigabytes.
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GB = MB * 1024
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// TB is the terabytes.
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TB = GB * 1024
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// PB is the petabytes.
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PB = TB * 1024
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)
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// below constants are the size of commonly used types, for memory trace
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const (
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// SizeOfSlice is the memory itself used, excludes the elements' memory
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SizeOfSlice = int64(unsafe.Sizeof(*new([]int)))
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// SizeOfByte is the memory each byte occupied
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SizeOfByte = int64(unsafe.Sizeof(*new(byte)))
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// SizeOfString is the memory string itself occupied
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SizeOfString = int64(unsafe.Sizeof(*new(string)))
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// SizeOfBool is the memory each bool occupied
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SizeOfBool = int64(unsafe.Sizeof(*new(bool)))
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// SizeOfPointer is the memory each pointer occupied
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SizeOfPointer = int64(unsafe.Sizeof(new(int)))
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// SizeOfInterface is the memory each interface occupied, exclude the real type memory usage
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SizeOfInterface = int64(unsafe.Sizeof(*new(any)))
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// SizeOfFloat64 is the memory each float64 occupied
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SizeOfFloat64 = int64(unsafe.Sizeof(*new(float64)))
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// SizeOfUint64 is the memory each uint64 occupied
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SizeOfUint64 = int64(unsafe.Sizeof(*new(uint64)))
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// SizeOfInt32 is the memory each int32 occupied
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SizeOfInt32 = int64(unsafe.Sizeof(*new(int32)))
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// SizeOfInt is the memory each int occupied
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SizeOfInt = int64(unsafe.Sizeof(*new(int)))
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// SizeOfUint8 is the memory each uint8 occupied
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SizeOfUint8 = int64(unsafe.Sizeof(*new(uint8)))
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// SizeOfUint is the memory each uint occupied
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SizeOfUint = int64(unsafe.Sizeof(*new(uint)))
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// SizeOfFunc is the memory each function occupied
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SizeOfFunc = int64(unsafe.Sizeof(*new(func())))
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// SizeOfInt64 is the memory each int64 occupied
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SizeOfInt64 = int64(unsafe.Sizeof(*new(int64)))
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// SizeOfMap is the memory each map itself occupied
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SizeOfMap = int64(unsafe.Sizeof(*new(map[int]int)))
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)
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