Update (Jan 24, 2019):
This question was asked 4 years ago about Go 1.4 (and is still getting views). Profiling with pprof has changed dramatically since then.
Original Question:
I'm trying to profile a go martini based server I wrote, I want to profile a single request, and get the complete breakdown of the function with their runtime duration.
I tried playing around with both runtime/pprof
and net/http/pprof
but the output looks like this:
Total: 3 samples
1 33.3% 33.3% 1 33.3% ExternalCode
1 33.3% 66.7% 1 33.3% runtime.futex
1 33.3% 100.0% 2 66.7% syscall.Syscall
The web view is not very helpful either.
We regularly profile another program, and the output seems to be what I need:
20ms of 20ms total ( 100%)
flat flat% sum% cum cum%
10ms 50.00% 50.00% 10ms 50.00% runtime.duffcopy
10ms 50.00% 100% 10ms 50.00% runtime.fastrand1
0 0% 100% 20ms 100% main.func·004
0 0% 100% 20ms 100% main.pruneAlerts
0 0% 100% 20ms 100% runtime.memclr
I can't tell where the difference is coming from.
pprof. StartCPUProfile
on a different program and is getting the breakdown in the profile. – Sonny