--profile-svg doesn't work on windows, fails silently

[enthdegree]

pytest-profile uses pipes.py to create a pipe that converts a .prof file to an .svg using external programs, but pipes.py only produces posix-shell commands. The pipe is defined by pytest-profile as follows:

t = pipes.Template()
t.append("gprof2dot -f pstats $IN", "f-")
t.append("dot -Tsvg -o $OUT", "-f")
t.copy(self.combined, self.svg_name)

At the last line of the above snippet, pipes.py calls os.system( str_command ) with str_command being the following literal:

IN='<self.combined>'; gprof2dot -f pstats $IN |
{ OUT='<self.svg_name>'; dot -Tsvg -o $OUT; }

...which isn't valid Windows batch syntax.

[smarie]

Here is a temporary fix that worked for me: after the pytest run, execute the two following commands:

gprof2dot -f pstats prof/combined.prof > prof/tmp
dot -Tsvg -o prof/combined.svg prof/tmp

Note that for the 'dot' command to be available you need to install http://www.graphviz.org and add its bin directory to the path. The gprof2dot command is added to your python installation when you install pytest-profile.

[eeaston]

Hi guys, thanks for raising this. This is related in part to #70 in that it doesn't raise sensible errors when the dot executable is missing. Also you're right that we don't support Windows properly, this is on my list (just noticed these guys which looks promising https://www.appveyor.com )

[smarie]

For reference I fixed this in PR #99 by using a proper subprocess.Popen to have a real cross-platform interoperability.

[naught101]

This also happens on OSX - it says that the svg has been saved, but it hasn't.

[smarie]

PR #99 was merged a long time ago so the only thing that is missing is ... a new release :)