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Re: [Discuss-gnuradio] USRP I/O Buffering


From: Vanush Vaswani
Subject: Re: [Discuss-gnuradio] USRP I/O Buffering
Date: Mon, 8 Sep 2014 08:50:17 +1000

Try messing around with the buffer size in
gnuradio-runtime/lib/flat_flowgraph.cc

#define GR_FIXED_BUFFER_SIZE

On Mon, Sep 8, 2014 at 6:24 AM, Peter Witkowski <address@hidden> wrote:
> Hello,
>
> I have a simple application written in Python using GNURadio.  All I am
> trying to accomplish is to have the USRP data be written to disk.  The
> application works fine when I dump data to /dev/null or run it at reduced
> sampling rates.  However, when I run at my desired sampling rate, I have a
> good amount of buffer overflows (a series of "O" characters get printed).
>
> The host machine that I am working on should have no problems sampling at
> the higher rates, but I have found a curious issue in that not a whole lot
> of memory is used up by my GNURadio application.
>
> As a result, I am wondering if there is any way to tell GNURadio to use
> larger buffers (on the order of a few GB) in order to prevent data from
> being dropped.  I noted that there seem to be several function calls
> available in the C++ API, but there seems to be a limited set of these calls
> in the Python wrappers.  Latency is a non-issue for me at the moment, but I
> need to capture all the data without dropping a large amount of data.  Note
> that I have the code running with "real-time" priorities in Linux.
>
> Thanks for your help.  FYI I am running GNURadio on Ubuntu 14.04.  Also, I
> know that my RAID set-up is capable of writing to disk at twice the rate of
> data coming in per benchmarking the HDDs.
>
> --
> Peter Witkowski
> address@hidden
>
> _______________________________________________
> Discuss-gnuradio mailing list
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>



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