Re: [Discuss-gnuradio] top block edge list

[Tom Rondeau]

On Thu, Oct 2, 2014 at 9:48 AM, Ryan Marlow <address@hidden> wrote:

Hey Jeff,

 I had previously found those two options but was unsure if I was missing anything else. dot_graph() seemed like a good option but it doesn't have the block port information, like the term "dot graph" implies. I suppose I'll just wait until after tb.start().

Thanks for your response,
Ryan

Hi Ryan,

The reason edge_list() isn't populated until after the call to start is because the graph hasn't been properly structured until start is called. That's when all of the buffers are created and connected between blocks. The edge list is used there, and it's use as a diagnostic tool by the user is kind of secondary.

I'm trying to understand what you think "dot graph" implies. It's a graph that uses the 'dot' format[0]. I agree that it would be nice if there was a way to represent the port numbers in here, too, though.

Also, we have plans for some gnuradio-runtime restructuring for our 3.8 release. One of my plans is to make automatically walking the graph a lot easier from the outside. I've run into this myself and you and others have asked similar questions, and we've all made compromises based on the current tools. For benchmarking and optimization, we really want to be able to interrogate the top block more effectively. Of course, I'm assuming you're not going to want to wait until 3.8 for this since you're probably looking to graduate :)

Tom

[0] http://www.graphviz.org/content/dot-language

 

Ryan,

You can print the edge list using

  print tb.edge_list()

BUT, it's not populated until after tb.start(). You can either wait until after tb.start(), or you can use

  print tb.dot_graph()

before tb.start(). It's meant to be input to dot (graphviz) but it's human readable. "dotty" didn't actually parse it right, but I could have done something wrong there.

- Jeff

On 10/01/2014 04:58 PM, Ryan Marlow wrote:

Hello All,
I'm trying to access the data inside the top block class, from a custom
function or at the very least print out some of it as a test. Is there a
way to see the data in the top block edge_list() before running
top_block.start()? I'd like to access this without modifying any of the
code in gnuradio-runtime so just using already provided functions in
top_block.
Thanks,
Ryan

--
Ryan L. Marlow
Research Assistant in CCM Lab <http://ccm.ece.vt.edu>
Virginia <http://www.vt.edu/> Polytechnic Institute and State University


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--
Ryan L. Marlow
Computer Engineering - MS Student

Virginia Polytechnic Institute and State University

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