-- Messaggio originale -- Date: Fri, 12 Dec 2003 09:24:13 -0500 (EST) From: Jeremy Siek To: Boost Users mailing list Subject: Re: [Boost-users] newbie BGL problem: core dump due to graph size Reply-To: Boost Users mailing list

Hi Duccio,

The only intrinsic size limitations, say for adjacency_list, that I am aware of are in the range of numbers representable by an "int". As for

Thx a lot for your help. Giving a look in the CVS I've found a "Nonrecursive version" of the depth_first_search.hpp . It should fix a problem in the Stack generated in the boost 1.30.2 version (that I was using). Since substituting the old implementation with this new file perfectly fixed my problem (the code now uses less RAM and is perfectly stable also with my largest network), I conclude that I was experiencing exactly that Stack bug in the routine. Thanks again, and especially thanks A LOT to Bruce Barr who wrote the new implementation!! Duccio the

algorithms, I am not aware of any size limitations. Of course, there's always the possibility of a bug in there somewhere...

Cheers, Jeremy

On Thu, 11 Dec 2003 duccio.medini@tin.it wrote: duccio> Hi all. duccio> duccio> I am calculating the connected components of af graph with a c++ code duccio> written with BGL. duccio> My graph is huge (4E+05 vertexes, 10^6 ~ 10^8 edges). duccio> The code uses the connected_components algorithm (or, in a different duccio> version, directly the depth_first_visit one) and works well up to a duccio> "reasonable" number of edges in the graph. duccio> Over this threshold it core dumps. duccio> I have the same problem both on SPARC Solaris 9 g++3.2.2 and on Intel Linux duccio> 2.4 g++3.1 . duccio> I know that it should not be a problem of the RAM memory available on the duccio> system (or addressable form a single istance). I am able to use up to 6-7 duccio> GBs of RAM, and it tipically core dumps at 2.5-5 GBs. duccio> duccio> I suspect that I'm violating some intrinsic size limit in the BGL duccio> adjacency_list class or similar. duccio> Are there such limits, and can they be extended? duccio> Any clue would be really appreciated. duccio> duccio> Thanks in advance! duccio> duccio> Duccio Medini

---------------------------------------------------------------------- Jeremy Siek http://php.indiana.edu/~jsiek/ Ph.D. Student, Indiana Univ. B'ton email: jsiek@osl.iu.edu C++ Booster (http://www.boost.org) office phone: (812) 856-1820 ----------------------------------------------------------------------

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