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----
-lang: en
-layout: doc
-permalink: /doc/profiling/
-redirect_from:
-- /en/doc/profiling/
-- /doc/Profiling/
-- /wiki/Profiling/
-ref: 48
-title: Python profiling
----
-
-This is a python profiling primer.
-
-For the purpose of this document, `qubes-dev` is name of the domain used for postprocessing profiling stats.
-
-## Requirements
-
-~~~
-yum install gprof2dot graphviz
-git clone http://git.woju.eu/qubes/profiling.git
-~~~
-
-If you profile something in dom0, move `Upload.sh` from the repository to dom0:
-
-~~~
-mkdir -p ~/profiling
-qvm-run -p qubes-dev 'cat ~/profiling/Upload.sh' > ~/profiling/Upload.sh
-~~~
-
-- WARNING: this will obviously be running third-party code which is not signed by ITL nor Fedora. You have been warned.
-
-## Workflow
-
-### Identify function responsible for some slow action
-
-You have to select the area in which you suspect less than optimal performance. If you do not narrow the area, graphs may be unreadable.
-
-### Replace suspect function with probe
-
-Replace
-
-```python
-def foo(self, bar):
-    # function content
-```
-
-with
-
-```python
-def foo(self, *args, **kwargs):
-    profile.runctx('self.real_foo(*args, **kwargs)', globals(), locals(),
-        time.strftime('/home/user/profiling/foo-%Y%m%d-%H%M%S.pstats'))
-
-def real_foo(self, bar):
-    # function content
-```
-
-### Run application
-
-Beware that some functions may be called often. For example `qubesmanager/main.py:update_table` gets run once per second. This will produce one pstat file per second.
-
-Remember to revert your changes to the application afterwards.
-
-### Upload statistics
-
-If you are in dom0:
-
-~~~
-cd ~/profiling
-./Upload.sh
-~~~
-
-### Analyse
-
-~~~
-make
-~~~
-
-For every `${basename}.pstats` this will produce `${basename}.txt` and `${basename}.svg`. SVG files contain call graphs. Text files contain lists of all functions, sorted by cumulative execution time. You may also try `make all-png`.
-
-~~~
-make index.html
-~~~
-
-This creates `index.html` with all SVG graphics linked to TXT files, ready for upload.
-
-~~~
-make REMOTE=example.com:public_html/qubes/profiling/ upload
-~~~
-
-## Example
-
-This example is from `qubes-manager` (`qubesmanager/main.py`).
-
-!["update\_table-20140424-170010.svg"](//attachment/doc/update_table-20140424-170010.svg)
-
-It is apparent that the problem is around `get_disk_usage`, which calls something via `subprocess.call`. It does this 15 times, probably once per VM.