In 2023, The Go programming language has released its first Release Candidate (RC) for version 1.21, which is packed with new features, improvements, and performance enhancements. In Go 1.21, the process of enabling PGO optimization has been streamlined. By default, the standard approach is to store a pprof CPU profile with the filename “default.pgo” in the main package directory of the profiled binary.

The clear function is a built-in function that takes an argument of type map, slice, or type parameter type. It is used to delete or zero out all the elements within the provided data structure. In Go 1.21, the Go distribution consists of a go command and a bundled Go toolchain, which is the standard library as well as the compiler, assembler, and other tools. The go command can use its bundled Go toolchain as well as other versions that it finds in the local PATH or downloads as needed.