Hi, FYI, I came back to this using both igraph for R and graph-tool [1], over the same graph and they took ~2s to compute SCC. So, I guess something is not working as expected in the python interface :) Please, let me know if I can help somehow to debug this.
Regards, [1] http://graph-tool.skewed.de/ On Tue, Apr 28, 2015 at 3:15 PM, Santiago Videla <[email protected]> wrote: > Hi, > > Thanks for the reply. Just to let you know, it ended a few hours after I > sent my email, so I guess it was just hard to compute :) > > Regards, > > On Mon, Apr 27, 2015 at 9:31 PM, Gábor Csárdi <[email protected]> > wrote: > >> Hi, SCC is linear, so it should not take too long. I would try a smaller >> graph first, then a bit bigger one, etc. to see how it scales. >> >> But it is suspicious that something went wrong. >> >> G. >> >> On Mon, Apr 27, 2015 at 4:12 PM, Santiago Videla < >> [email protected]> wrote: >> >>> Hi all, >>> >>> I recently started to use igraph (from python) and after playing a bit >>> with it I loaded a directed graph with ~1.5 millions nodes and ~100 >>> millions edges. I know there are cycles and I'd like to identify them all >>> (I believe that most of them are of the form A <-> B). I'm trying to >>> compute the SCC of the graph. I guess there are plenty of things that in >>> practice could have an impact on how the algorithm performs. But, does >>> anyone have experience computing SCC on a graph of similar scale? How long >>> (aprox) could it take? I ask because it has been running for 75 hours by >>> now, and the memory seems quite stable around 3.5GB (Intel Core i5 2.67GHz >>> - 16GB RAM). >>> >>> Do you think this is normal/expected? Should I just keep waiting? >>> >>> Regards, >>> >>> -- >>> Santiago Videla >>> http://www.linkedin.com/in/svidela >>> >>> _______________________________________________ >>> igraph-help mailing list >>> [email protected] >>> https://lists.nongnu.org/mailman/listinfo/igraph-help >>> >>> >> >> _______________________________________________ >> igraph-help mailing list >> [email protected] >> https://lists.nongnu.org/mailman/listinfo/igraph-help >> >> > > > -- > Santiago Videla > http://www.linkedin.com/in/svidela > -- Santiago Videla http://www.linkedin.com/in/svidela
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