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fgprof is a sampling Go profiler that allows you to analyze On-CPU as well as Off-CPU (e.g. I/O) time together. Go's builtin sampling CPU profiler can only show On-CPU time, but it's better than fgprof at that. Go also includes tracing profilers that can analyze I/O, but they can't be combined with the CPU profiler. fgprof is designed for analyzing applications with mixed I/O and CPU workloads. This kind of profiling is also known as wall-clock profiling. If this is the first time you hear about fgprof, you should start by reading about The Problem & How it Works. fgprof is compatible with the go tool pprof visualizer. Which tool you prefer is up to you, but one thing I like about Gregg's tool is that you can filter the plaintext files using grep which can be very useful when analyzing large programs.
Features
- fgprof is compatible with the go tool pprof visualizer
- fgprof is designed for analyzing applications with mixed I/O and CPU workloads
- fgprof is a sampling Go profiler that allows you to analyze On-CPU as well as Off-CPU
- Go's builtin sampling CPU profiler can only show On-CPU time
- fgprof is implemented as a background goroutine that wakes up 99 times per second
- This data is used to maintain an in-memory stack counter which can be converted to the pprof or folded output format
Project Samples
