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

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 <w6rz@comcast.net> 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:

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