Ability to view Golang graphs

[netflix]

Ability to view Golang graphs

[felixge]

It's now possible to use FlameScope with go1.19+ - I've written a tool and blog post for it here: https://blog.felixge.de/flamescope-for-go/

[Liron24]

Hi, I'm getting the same stacktrace and I'm running Java application, any ideas about it?

[spiermar]

@Liron24 what kind of profile are you trying to open?

[Liron24]

@spiermar not sure about the answer to your question.
I have performed the basic example you have provided:
$ sudo perf record -F 49 -a -g -- sleep 120
$ sudo perf script --header > stacks.myproductionapp.2018-03-30_01

It produces a perf file, I moved it to the examples folder, saw it on the flamescope but when I tried to open the stacktrace showed here appeared.
Any ideas?

[spiermar]

Ok, so the previous issue was that the trace was generated from trying to open a non-perf profile. Can you share profile with us to reproduce?

[Liron24]

@spiermar it's our production application, I can't really share it, is there any other information I can provide you to understand what's going on? Or any other instructions for me to try and troubleshoot this?

[spiermar]

@Liron24 if it's that exact error

cols = int(ceil(end) - floor(start))
OverflowError: cannot convert float infinity to integer

Likely the error is caused by a failure to parse a start and/or end timestamps of the profile:

https://github.com/Netflix/flamescope/blob/master/app/util/heatmap.py#L84

If you compare your profile with the examples in the repo, do they look similar? Same format?

[Liron24]

@spiermar my generated perf.data is a binary and I can't really read it while the other examples I can clearly open and read. Is there any other command to generate a profile to be similar to the examples?

[spiermar]

Ok, so looks like you're trying to open the raw perf record data, not the output of perf script, which it's text format.

[Liron24]

@spiermar you were right. I managed to view an heat map of the stacks output, however, all the classes shows as "unknown", could it stems from the errors I got when creating the stacks?
Failed to open <> , continuing without symbols

[spiermar]

Yes, unknowns are missing symbols.