Use of uninitialized value $pname in string eq at ./stackcollapse-perf.pl line 214, <> line 515

[Shahor]

Hello there!

From a fresh clone, I got this error when I try to use this script.
I was following this blog post : http://www.brendangregg.com/blog/2014-09-17/node-flame-graphs-on-linux.html

[lostcontrol]

Same here. Maybe some changed in the newer Perf versions?

$ perf version
perf version 3.19.3

[agj32mrgibbits]

Make sure perf is recording your pid. If you run pgrep -n node yourself, is the pid showing up? Maybe try recording your process like this: perf record -g -F 99 COMMAND.

[Shahor]

The PID was showing up.

[tp-m]

For what it's worth: had the same problem, in my case it was because I didn't pass -g to perf.

[evgkrsk]

Same issue for me:

root@teer ~ # perf --version;perl --version
perf version 3.14.0
This is perl 5, version 20, subversion 1 (v5.20.1) built for i686-linux-thread-multi
root@teer ~ # perf script|stackcollapse-perf.pl|flamegraph.pl >/dev/null
Use of uninitialized value $pname in string eq at /usr/bin/stackcollapse-perf.pl line 214, <> line 33030.
...

[Yamakaky]

Same thing, perf -g ... fixes it. You should put a note in the README.