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Subject: Re: [boost] [BGL] Multithread problem inserting edges and exploring the same graph
From: Cosimo Calabrese (cosimo.calabrese_at_[hidden])
Date: 20090921 10:59:59
> Here are some ideas:
> Do you need all of the properties in the explorer threads? maybe you
> can construct a somewhat cheap copy of the graph of just vertices,
> edges and weights?
Unfortunately no, my graph has 5 million of vertices and 10 million of
edges, and the properties RAM cost is very lower confronted to the graph
structure. The graph structure takes approximately the same RAM quantity
of the graph + properties.
Moreover I've tried to make a graph copy, but it takes about 30 seconds
on my machine (Pentium D 2.8GHz, 3Gb RAM, WinXP); it's too much
confronted to the Dijkstra's time (about 67 seconds).
>
> When each explorer thread runs an instance of Dijkstra you might
> consider a parallel version of Dijkstra [1,2] working on disjoint
> graph regions? That might allow you to cut the graph into pieces and
> assigning a 'local' version of the graph to each explorer thread and
> joining them later on?
>
These arguments are relatively new to me... do you think that's the way?
I've take a look to PBGL and MTGL:
https://software.sandia.gov/trac/mtgl/
http://www.osl.iu.edu/research/pbgl/
Maybe I can use them to resolve my problem?
Thanks,
Cosimo Calabrese.
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