Re: [Boost-users] Details of boost parallel graph implementation

Subject: Re: [Boost-users] Details of boost parallel graph implementation
From: Mahesh Barve (mahesh.barve_at_[hidden])
Date: 2015-07-31 00:47:14

Hi Marcin,

 Thanks for the reply. 

1.  Which are the files in the source tree where I can get the details of 
implementation of queue,graph and the property map for serial as well as 
distributed (MPI ) cases. 
Is there any document that gives details of the implementation?

2. How often are the property maps on various nodes synchronized and under 
what condition? 

3. Is there any synchronisation with respect to the queues ? Where can I 
get more details of these?

please help,
regards,
-Mahesh

From:   Marcin Zalewski <marcin.zalewski_at_[hidden]>
To:     boost-users_at_[hidden]
Date:   07/30/2015 10:03 AM
Subject:        Re: [Boost-users] Details of boost parallel graph 
implementation
Sent by:        "Boost-users" <boost-users-bounces_at_[hidden]>

On Wed, Jul 29, 2015 at 4:26 AM Mayank Bakshi <mayank.bakshi_at_[hidden]> 
wrote:
Hello,

I am working on mpi implementation of boost for breadth first search. 
What is the algorithmic detail for BFS in boost.mpi? How the graph is 
processed by each rank which we provide in mpirun (load distribution among 
different processes)? 

The sequential BGL library is overloaded on distributed graphs:

https://github.com/boostorg/graph/blob/master/include/boost/graph/breadth_first_search.hpp

Look for the mpl::true_ and mpl::bool_ to see where distributed vs. 
not-distributed selection is made. graph_parallel provides some additional 
overloads of the helper, but it does not define a brand new BFS:

https://github.com/boostorg/graph_parallel/blob/master/include/boost/graph/distributed/breadth_first_search.hpp

The whole magic happens in the queue, graph, and property maps data 
structures. The queue distributes work, and it also implements a global 
"empty" check, and the property maps allow accessing remote vertices. So, 
if you need MPI BFS, one is already there.  
_______________________________________________
Boost-users mailing list
Boost-users_at_[hidden]
http://lists.boost.org/mailman/listinfo.cgi/boost-users
=====-----=====-----=====
Notice: The information contained in this e-mail
message and/or attachments to it may contain 
confidential or privileged information. If you are 
not the intended recipient, any dissemination, use, 
review, distribution, printing or copying of the 
information contained in this e-mail message 
and/or attachments to it are strictly prohibited. If 
you have received this communication in error, 
please notify us by reply e-mail or telephone and 
immediately and permanently delete the message 
and any attachments. Thank you