Heap Escape Analysis in Go

Warning

This page is extremely rough and will contain incorrect code and lack of explanation.

I want to figure out if my go program is making any allocations to the heap.

go test -run none -bench . -benchtime 10s -benchmem

Output:

goos: darwin
goarch: arm64
pkg: src.naesna.es/aoc/go/2024
cpu: Apple M1 Pro
BenchmarkDay1Part1-10              56686             62211 ns/op           83192 B/op         26 allocs/op
PASS
ok      src.naesna.es/aoc/go/2024       4.405s

You can also get a memory profile

-memprofile mem.out

Then use go tool pprof to check allocation space.

go tool pprof -alloc_space program_name.test mem.out

then do list <funcname>

Another log of where things are escaping to heap is from is using gcflags:

go build -gcflags "-m -m"