pat

Performance Analysis Toolbox for Go programs.

Usage

Get with:

go install github.com/maruel/pat/cmd/...@latest

disfunc

Disassemble a function at the command line with source annotation.

Example: disassemble function nin.CanonicalizePath() when building ./cmd/nin:

disfunc -f 'nin\.CanonicalizePath$' -pkg ./cmd/nin | less -R

Colors:

• Green: calls/returns
• Red: panic() due to bound checking and traps
• Blue: jumps (both conditional and unconditional)
• Violet: padding and noops
• Yellow: source code; bound check highlighted red

disfunc uses go tool objdump output.

boundcheck

Lists all the bound checks in a source file or package. Useful to do a quick audit:

boundcheck -pkg ./cmd/nin | less -R

boundcheck uses go tool objdump output. An alternative way is to use go build -gcflags="-d=ssa/check_bce/debug=1"