Hi All, Can anyone please help me with this. Please let me know if you need any more information. I can also provide remote access if you need access to an environment with everything setup to test. Thanks, Alok On Tue, Apr 8, 2014 at 11:42 AM, Alok Kumbhare <kumbhare@usc.edu> wrote:
Hi All, i need some help with parallel boost graph library. Sorry if this is not the right list to post. Posting here since it looks like it might be a but.
In particular, i am trying to modify the structure of the graph (distributed adjacency list) after it is loaded. The code snippet is at http://pastebin.com/erizQ0Sf.
The problem is that clear_vertex(v,g) and remove_vertex(v,g) does not seem to operate on the same vertex in the graph.
Here is a sample graph in metis format: http://pastebin.com/qxy2w6aw (I use the default vertex distribution for this example)
The graph_viz output is available here for different scenarios:
As you can see in the above figure:
The first image is the original graph split into two partitions (mpirun -np 2 ./test)
The second image is after clear_vertex is called for one of the vertices. Notice vertex "0". All the edges are removed as expected.
The third image is after remove_vertex is called (which is called after clear_vertex, as mentioned in the documentation here: http://www.boost.org/doc/libs/1_55_0/libs/graph_parallel/doc/html/distribute...). Notice here that the vertex "2" is removed instead of vertex "0" even when using the same vertex descriptor for both calls.
One thing i noted is that the remove_vertex seems to remove the "last" vertex in that partition irrespective of the input. e.g. if i use v = vertex(1,g) in the above code, i still see that the vertex "2" is removed and the edges rearranged for that.
Is this a bug or am i doing something wrong.
Your help will be greatly appreciated.
Thanks, Alok Kumbhare