Profiling Go Code FLAME GRAPHS Ram Nadella Online Marketplace CPU - PowerPoint PPT Presentation

Profiling Go Code FLAME GRAPHS Ram Nadella

Online Marketplace

CPU Flame Graph of Linux Kernel

Flame Graphs • Function call stacks • Each cell => Function • Width => cost of the function • Colors have no meaning

Flame Graphs • SVG file • Interactive

Generating CPU Flame Graphs • Use perf/stap/dtrace to generate call stacks • Collapse stacks & generate SVG file brendangregg.com/FlameGraphs/cpuflamegraphs.html

Go

Setting up import _ “net/http/pprof"

Setting up import _ “net/http/ pprof "

pprof • Registers http handlers that expose profiling actions • /debug/pprof/profile • /debug/pprof/trace • /debug/pprof/heap

Setting up package main import _ "net/http/pprof" func main() { … go func () { http.ListenAndServe(":27590", nil) }() … }

Setting up package main import _ "net/http/pprof" func main() { … go func () { http.ListenAndServe(":27590", nil) }() … }

Profiling Go Code: Flame Graphs > go get https://github.com/uber/go-torch > git clone https://github.com/brendangregg/FlameGraph > go-torch --time=10 --file “torch.svg" \ --url http://<host>:<port>

Profiling Go Code: Flame Graphs > go get https://github.com/uber/go-torch > git clone https://github.com/brendangregg/FlameGraph > go-torch --time=10 --file “torch.svg" \ --url http://<host>:<port>

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References • Flame Graphs • go-torch