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Re: [Discuss-gnuradio] Parallel programming

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] Parallel programming
Date: Mon, 10 Jan 2011 15:35:13 -0500
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On 01/10/2011 03:11 PM, sirjanselot wrote:
How do I know that my flow-graph is executing in thread per block mode?

As far as I can tell my only 1 core out of the 8 is being used when I run my
flow-graphs.  This is what I see when I run the performance monitor (or
whatever it is called) in Ubuntu.

I am currently using gnuradio 3.3.0 as my version.

So can I parallelize my block without having to create a meta-block as you
say?  I have a lot of for-loops and vector calculations that need to be
optimized (adaptive fir filters).
By default, each flow-graph is assigned its own thread. It's up to the kernel to schedule these as it sees fit.

Getting parallelism *inside your own custom block* is something you'll have to deal with yourself.

I've done experiments with using the multi-threaded FFTW libraries for very large transforms, which causes internal parallelism with the FFTW library. This works, and doesn't appear to adversely affect Gnu Radio
  thread-per-block scheduling.

The thread-per-block scheduler is the default behaviour, so the reason you may only be seeing one core in use is just
  due to the dynamic behaviour of your flowgraph.

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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