Hi All,

i need some help with parallel boost graph library.

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  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/distributed_adjacency_list.html#structure-modification). Notice here that the vertex "2" is removed instead of vertex "0" even when using the same vertex descriptor for both calls.

I tried putting synchronize(g) after each call, or at the end of both calls. but both gives the same results.

Is this a bug or am i doing something wrong.

Your help will be greatly appreciated.

Thanks,

Alok Kumbhare