[Go] Optimizing Go

Reference:
Lock Laptop CPU performance (linux only) to avoid throttling.
https://github.com/aclements/perflock
High Performance Go Workshop
https://dave.cheney.net/high-performance-go-workshop/gopherchina-2019.html
cmd/compile
https://golang.org/pkg/cmd/compile/
go build -gcflags doc
https://github.com/golang/go/blob/master/src/cmd/compile/internal/ssa/compile.go
SSA:
https://godoc.org/golang.org/x/tools/go/ssa



Which function is inlined or not/heap alloc or not:
$ go build -gcflags='-m -m' *.go
$ go build -gcflags=-d=ssa/check_bce/debug=1 *.go



Prove path (SSA aka. Static Single-Assignment):
$ go build -gcflags=-d=ssa/prove/debug=1 *.go
$ go build -gcflags=-d=ssa/prove/debug=2 *.go


code snippet:
internally, string as key of a map internally converted to []byte:

m = make(map[string]string)
# clear it, it's fast after Go v1.11
for k := range m {
 delete(m, k)
}

Count string size::

n := len([]rune(str))

Tooling, dump SSA to ssa.html
$ GOSSAFUNC=FuncName go build && open ssa.html