[Libreoffice-bugs] [Bug 118822] PDF export with bitmap Page background rather slow (not with lossless)

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=118822

--- Comment #5 from Telesto <telesto at surfxs.nl> ---
(In reply to Julien Nabet from comment #4)
> buovjaga: thought you might be interested in this one.
> Would it be possible you give a step by step procedure to retrieve a
> flamegraph?

I asked the same (e-mail). Quote from Buovjaga:
I started doing them after asking Noel, if he finds my callgrind traces for
fileopen bugs useful. He said he always does the traces again using perf. I had
forgotten that Noel wrote instructions about perf + flamegraph:
https://wiki.documentfoundation.org/Development/How_to_debug#Performance_debugging_.28perf.29

I decided to start doing the traces with perf primarily, because callgrind can
take a hell of a long time. As mentioned in the wiki section, perf "produces
less detailed output than callgrind, but is much cheaper to run (since it's a
sampling profiler)". If the perf result is not enough, we (or a dev wanting to
fix something) could always use callgrind.

Noel advised me to use a sampling frequency of 200.

So if I am recording something that is not fileopen, I give the command:
perf record -F 200 --call-graph dwarf --pid=`pidof soffice.bin`

and then hit Ctrl-C in the terminal after the action in LibreOffice was
completed.

Then I do this in the same dir with the perf.data to create the flamegraph (the
scripts are in my path, installed flamegraph-git from Arch Linux AUR repo):
perf script | stackcollapse-perf | flamegraph --width 4096 --height 24 >
perf.svg

If I want to do a fileopen trace:
export OOO_EXIT_POST_STARTUP=1; perf record -F 200 --call-graph dwarf
~/libreoffice/instdir/program/soffice document.odt

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