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Re: [igraph] Computing SCC on large graph

From: Gábor Csárdi
Subject: Re: [igraph] Computing SCC on large graph
Date: Mon, 27 Apr 2015 20:31:37 -0400

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.


On Mon, Apr 27, 2015 at 4:12 PM, Santiago Videla <address@hidden> 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?


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