Re: [Discuss-gnuradio] gnuradio on ARM: gr_vmcircbuf_sysv_shm: shmat (3): Invalid argument

[Tom Rondeau]

On Tue, Aug 27, 2013 at 1:51 PM, esterhui
<address@hidden> wrote:
>> You can override it in the ~/.gnuradio/prefs/vmcircbuf_default_factory
>> file.
>>
>
> Thanks for the input, I can override with:
>
> gr::vmcircbuf_mmap_shm_open_factory
> or
> gr::vmcircbuf_mmap_tmpfile_factory
>
> and now things seem to work. I believe I know what happened though - the

Great!

> very first time I compiled gnuradio, it was in the qemu user environment,
> where gr::vmcircbuf_sysv_shm passed, this then was added to the
> ~/.gnuradio/prefs/vmcircbuf_default_factory file. I then NFS mount this
> stuff to the Zynq processor (where sysv_shm doesn't work). The key is to
> either remove ~/.gnuradio when switching between qemu (emulated
> environment) and the real deal, or to override the
> vmcircbuf_default_factory file.
>
> Cheers
>
>  - Stephan

Ah, that makes sense. Glad you got things working in your environment.

-- 
Tom
Visit us at GRCon13 Oct. 1 - 4
http://www.trondeau.com/grcon13

>
> On Tue, Aug 27, 2013 at 07:41:33AM -0700, Tom Rondeau-2 [via GnuRadio]
> wrote:
>
>>
>>
>> On Tue, Aug 27, 2013 at 10:15 AM, Philip Balister <[hidden email]> wrote:
>> > On 08/27/2013 09:58 AM, Johnathan Corgan wrote:
>> >> On Tue, Aug 27, 2013 at 6:43 AM, Philip Balister <[hidden email]>wrote:
>> >>
>> >>
>> >>> The circular buffer is going to become more and more painful as we try
>> >>> to do cool stuff with Zynq.
>> >>>
>> >>
>> >> Agree.  This was a good topic of discussion at the last hackfest in
>> >> Virginia, and I expect there will be a presentation or two at GRCON13
>> >> on
>> >> alternatives when dealing with FPGA and GPU offload architectures.
>> >>
>> >
>> > In the short term, do you know which buffer allocator GNU Radio prefers
>> > to use? Can we just disable the shm based one?
>> >
>> > Philip
>> >
>>
>> You can override it in the ~/.gnuradio/prefs/vmcircbuf_default_factory
>> file.
>>
>> Just put in there the line (with no newline):
>>
>> gr::vmcircbuf_createfilemapping_factory
>>
>>
>> And that will tell the system to use that method of managing the
>> circular buffers.
>>
>> Though it's supposed to test to see if your system can handle the
>> shared memory method first before setting this prefs file. So I guess
>> there's something different on the ARM that's not being tested for
>> compliance here.
>>
>> --
>> Tom
>> Visit us at GRCon13 Oct. 1 - 4
>> http://www.trondeau.com/grcon13
>>
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>>
>>
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>
> --------------------------------------------------
> Stephan Esterhuizen
>
> GPS Systems Group
> NASA/Jet Propulsion Lab
> California Institute of Technology
>
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> shmat (3): Invalid argument
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