Re: [Discuss-gnuradio] buffer allocation failing with RuntimeError: bad_alloc

[Bastian Bloessl]

AFAIS, there are two parameters for shared memory: shmmax and shmall.
The first sets the maximum size for a single segment, the latter the
total available shared memory (in number of pages).

You could try to increase shmall as well.

Best,
Bastian

On 11/21/19 11:58 AM, Eamon Heaney wrote:
> Yeah, I tried changing the maximum shared memory, but that didn't work.
> I mean, it didn't resolve the problem; I gave it 2147483648 but the
> error persists. I tried adding a zero to that, but that's an "Invalid
> Argument."
> 
> On Thu, Nov 21, 2019 at 5:17 AM Ron Economos <address@hidden
> <mailto:address@hidden>> wrote:
> 
>     You must be running an older kernel that doesn't set kernel.shmmax
>     to some large value.
> 
>     To check the current setting:
> 
>     sysctl kernel.shmmax
> 
>     To set it higher:
> 
>     sudo -w kernel.shmmax=2147483648
> 
>     Ron
> 
>     On 11/21/19 01:59, Eamon Heaney wrote:
>>     I'm running the sample wifi_tx.grc flowchart from gr-ieee802.11,
>>     substituting a null sink for the USRP sink to test it.
>>
>>     When I try to run it, it fails with the following error message:
>>     "
>>     >set_min_output_buffer on block 7 to 207744
>>     >set_min_output_buffer on block 9 to 2077440
>>     >set_min_output_buffer on block 11 to 2077440
>>     >set_min_output_buffer on block 12 to 207744
>>     >set_min_output_buffer on block 13 to 415488
>>     >set_min_output_buffer on block 14 to 207744
>>     >set_min_output_buffer on block 26 to 262144
>>     >set_min_output_buffer on block 27 to 96000
>>     >set_min_output_buffer on block 31 to 100000
>>     >gr::vmcircbuf_mmap_shm_open: mmap (1): Cannot allocate memory
>>     >gr::buffer::allocate_buffer: failed to allocate buffer of size
>>     1038720 KB
>>     >gr::vmcircbuf_mmap_shm_open: mmap (1): Cannot allocate memory
>>     >gr::buffer::allocate_buffer: failed to allocate buffer of size
>>     1038720 KB
>>     >Traceback (most recent call last):
>>     >  File "/home/vtti/working/wifi_tx.py", line 297, in <module>
>>     >    main()
>>     >  File "/home/vtti/working/wifi_tx.py", line 276, in main
>>     >    tb.start()
>>     >  File
>>     "/usr/local/lib/python3.6/dist-packages/gnuradio/gr/top_block.py",
>>     line 111, >in start
>>     >    top_block_start_unlocked(self._impl, max_noutput_items)
>>     >  File
>>     "/usr/local/lib/python3.6/dist-packages/gnuradio/gr/runtime_swig.py",
>>     line >5828, in top_block_start_unlocked
>>     >    return _runtime_swig.top_block_start_unlocked(r,
>>     max_noutput_items)
>>     >RuntimeError: std::bad_alloc
>>     "
>>     Here's a picture of my flowchart:
>>     gnuradio-runtimeError-bad_alloc.png
>>
>>     Tested this on a different machine, and it works fine, so the
>>     problem isn't with the flowchart itself. I'm working off the
>>     maint-3.8 branch, installed from source.
>>
>>     Any idea why I'm getting this error, or how I could resolve it?
>>     Thanks!
>>     -- 
>>     Eamon Heaney
>>     /
>>     /Fleet Commander/
>>     //
>>     /President, Model UN at Virginia Tech/
>>     /
> 
> 
> 
> -- 
> Eamon Heaney
> /
> /Fleet Commander/
> //
> /President, Model UN at Virginia Tech/
> /

-- 
Dr. Bastian Bloessl
Secure Mobile Networking Lab (SEEMOO)
TU Darmstadt, Germany

www.bastibl.net
GitHub/Twitter: @bastibl