igraph for python 2.7 not closing files after read

[yaniv.m.david]

running this code:

l = list()
for graphName in os.listdir(graphsDir):
      l.append(Graph.read(graphname))

when graphsdir has ~256 files will result in "Python: IOError: [Errno 24] Too many open files" in python 2.7, but not for python 2.6

im guessing the 2.7 version doesnt close the files after reading for some reason?

[Tamás Nepusz (ntamas)]

Thanks, will check soon. Could be a reference leak or something like that.

[Tamás Nepusz (ntamas)]

Could not reproduce the issue yet; tried on Mac OS X 10.8.2 and on a 64-bit Linux machine, both equipped with Python 2.7.

What platform are you using? Is it a 64-bit or a 32-bit machine? What is the exact Python and igraph version? What graph format are you trying to load?

[yaniv.m.david (yaniv-m-david)]

python 2.6.6 and 2.7.3. (both 32bit)
64bit machine, windows 7 64bit
gml format (exported from igraph using python 2.6)

[yaniv.m.david (yaniv-m-david)]

and - igraph 0.6 (from msi downloaded from the main site)

[Tamás Nepusz (ntamas)]

Platform-specific issue; seems to happen on Windows only. (Managed to reproduce it on a 32-bit Windows machine). FWIW, it does not happen on Mac OS X even if I lower the maximum number of file handles per process, so it seems like the problem lies not within igraph but maybe in Python itself. I'll keep on digging.

[Tamás Nepusz (ntamas)]

Alternatively, it could be the case that it is igraph's fault but I've fixed it already and that's why I don't see the error on my machine ;) I remember that I played around a bit with that part of the code recently. I will try to compile the current head of the 0.6 branch on a Windows machne and check if I still get the issue.

[Tamás Nepusz (ntamas)]

Apparently, this issue is already fixed in the most recent revision of the 0.6 branch. Please send me a private message via Launchpad (from my profile page) if you need an msi installer for a development snapshot of python-igraph for Python 2.7 so you can test it yourself.

[Gábor Csárdi (gabor.csardi)]

The development of igraph has moved to github, so please do not comment on this bug here. You are of course welcome to comment on github, here:
https://github.com/igraph/igraph/issues/126