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Re: [Discuss-gnuradio] To implement WiMAX with GnuRadio or not?
From: |
Alexander Chemeris |
Subject: |
Re: [Discuss-gnuradio] To implement WiMAX with GnuRadio or not? |
Date: |
Sat, 28 May 2011 19:47:44 +0400 |
On Sat, May 28, 2011 at 19:38, Michael Dickens <address@hidden> wrote:
> On May 28, 2011, at 11:26 AM, Alexander Chemeris wrote:
>> 5) How well is GnuRadio suited for real-time operation?
>
> In a general sense, yes, GNU Radio is well suited for real-time signal
> processing of data streams. That said: "Real time" is only meaningful
> knowing the performance criteria. What sort of performance do you require
> processing for?
Real-time is not about performance, but about predictability ;)
I have to be sure that my flowgraph always executes before the
deadline is hit. So everything that introduces jitter is a no-no.
>> 5.1) Specifically - is memory allocated from heap with malloc() or it
>> supports non-blocking memory pools?
>
> IIRC (Tom? Eric?): GNU Radio uses the standard C++ "new" command for most
> memory allocations -- and thus it is memory from the heap. One can always
> overload this method globally or locally if required, to provide memory from
> pools or other means.
Is this "new" called during the flowgraph execution loop? It's too
bad, if it is. Standard memory allocation schemes introduce random
delays in a thread execution. And implementation of a lock-free memory
allocator is a complex task. We used memory pools instead, but this
requires special care - you can't replace a "new" with memory pool
get() with a regexp.
>> 5.2) Can the whole flowgraph be executed from a single thread to
>> minimize cross-thread communication overhead (and jitter)?
>
> Yes. Your choices are a single thread for all or 1 thread per block. - MLD
Great.
--
Regards,
Alexander Chemeris.
- Re: [Discuss-gnuradio] To implement WiMAX with GnuRadio or not?, (continued)
- Re: [Discuss-gnuradio] To implement WiMAX with GnuRadio or not?, Jeff Brower, 2011/05/27
- Re: [Discuss-gnuradio] To implement WiMAX with GnuRadio or not?, Colby Boyer, 2011/05/27
- Re: [Discuss-gnuradio] To implement WiMAX with GnuRadio or not?, Marcus D. Leech, 2011/05/27
- Re: [Discuss-gnuradio] To implement WiMAX with GnuRadio or not?, Colby Boyer, 2011/05/27
- Re: [Discuss-gnuradio] To implement WiMAX with GnuRadio or not?, Alexander Chemeris, 2011/05/28
- Re: [Discuss-gnuradio] To implement WiMAX with GnuRadio or not?, Jeff Brower, 2011/05/27
- Re: [Discuss-gnuradio] To implement WiMAX with GnuRadio or not?, Alexander Chemeris, 2011/05/28
Re: [Discuss-gnuradio] To implement WiMAX with GnuRadio or not?, Alexander Chemeris, 2011/05/28
Re: [Discuss-gnuradio] To implement WiMAX with GnuRadio or not?, Alexander Chemeris, 2011/05/28
Re: [Discuss-gnuradio] To implement WiMAX with GnuRadio or not?, Almohanad Fayez, 2011/05/29
Re: [Discuss-gnuradio] To implement WiMAX with GnuRadio or not?, Marcus D. Leech, 2011/05/29