func makemap(t *maptype, hint int, h *hmap) *hmap { mem, overflow := math.MulUintptr(uintptr(hint), t.bucket.size) if overflow || mem > maxAlloc { hint = 0 } if h == nil { h = new(hmap) } h.hash0 = fastrand() B := uint8(0) for overLoadFactor(hint, B) { B...
每个程序员都应该掌握的Golang性能优化秘技 性能分析和优化是所有软件开发人员必备的技能,也是后台大佬们口中津津乐道的话题。 Golang 作为一门“现代化”的语言,原生就包含了强大的性能分析工具pprof 和 trace。pprof 工具常用于分析资源的使用情况,可以采集程序运行时的多种不同类型的数据(例如 CPU 占用、内存消耗...
funcmakemap(t*maptype,hint int,h*hmap)*hmap{mem,overflow:=math.MulUintptr(uintptr(hint),t.bucket.size)ifoverflow||mem>maxAlloc{hint=0}// initialize Hmapifh==nil{h=new(hmap)}h.hash0=fastrand()// Find the size parameter B which will hold the requested # of elements.// For hint...
v4 :=make(map[string][2]int) v5 :=make(map[string][]int) v6 :=make(map[string]map[int]int) v7 :=make(map[string][2]map[string]string) v7["n1"] = [2]map[string]string{map[string]string{"name":"武沛齐","age":"18"},map[string]string{"name":"alex","age":"78"}} v7[...
map的底层数据结构是hmap结构体。 type hmap struct { // Note: the format of the hmap is also encoded in cmd/compile/internal/reflectdata/reflect.go. // Make sure this stays in sync with the compiler's definition. count int // # live cells == size of map. Must be first (used by ...
int32Size := int32(1) int64Size := int64(1) arrSize := make([]int, 0) mapSize := make(map[string]string, 0) structSize := &Model{} funcSize := func() {} chanSize := make(chan int, 10) stringSize := "abcdefg" fmt.Println("bool sizeOf:", unsafe.Sizeof(boolSize)) ...
构建工具Make的使用; 依赖注入框架Wire的使用; Protobuf构建工具Buf的使用; ORM框架Ent的使用; OpenAPI在项目开发中的应用; 完整的CURD开发示例; 用户登陆认证。 为什么要学要用微服务框架? 我向身边的人推广微服务架构,但是经常会得到否定的态度,譬如:
func make(tType, size ...IntegerType)Type make()只适用于slice、map、chan,此三种类型创建时推荐使用make()而不是new()。The make built-in function allocates and initializes an object of type slice, map, or chan (only).Unlike new, make's return type is the same as the type of its arg...
WriteGoMapMutexUint-8 14.8µs ± 2% WriteHashMapUint-8 22.3µs ± 1% WriteGoSyncMapUint-8 69.3µs ± 0% The benchmarks were run with Golang 1.19.1 on Linux and a Ryzen 9 5900X CPU using make benchmark-perflock. Technical details Technical design decisions have been made...
/typeandvalue make(map[string]int) mode: value type: map[string]int make mode: builtin type: func(map[string]int) map[string]int map[string]int mode: type type: map[string]int string mode: type type: string int mode: type type: int m["hello, "+"world"] mode: value,assignable,...