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Subject: Re: [boost] [graph_parallel] Is a distributed directed edge list possible?
From: Dave Abrahams (dave_at_[hidden])
Date: 2011-01-05 14:43:12

At Wed, 5 Jan 2011 13:35:59 -0500 (EST),
Jeremiah Willcock wrote:
> On Mon, 3 Jan 2011, caustik wrote:
> > Is it currently possible to represent a highly connected graph where any
> > given vertex may contain more directed edges than can be held in a single
> > process' OutEdgeListS?
> >
> > I see that the distributed version of adjacency_list allows vertices to be
> > distributed across multiple processes in a process group, but I don't see
> > the ability to allow directed edges to be distributed across multiple
> > processes. Is this an intentional limitation?
> No, it is not possible. PBGL currently distributes graph vertices (a
> so-called 1-D distribution) and keeps each edge with its source
> vertex. To do what you are describing, we would need to implement 2-D
> (edge-based) distributions, which do not fit into the current PBGL
> design.

Another thought I had, if graph connectivity is really super-high, is
that you might be able to use the inverse graph representation.

Dave Abrahams
BoostPro Computing

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