Re: Error "gr::vmcircbuf_sysv_shm: shmget (1): No space left on device"

[Marcus Müller]

While this definitely reads like a BOFH excuse ("ran out of buffers to 
give"), it just means that for some reason, you can't allocate a shared 
buffer to build the ringbuffers needed by GNU Radio[1]

This is no surprise, really: Python has non-deterministic destruction, 
so your "del my_gr" doesn't instantly deconstruct the underlying object 
and thus doesn't free the buffers.

I sadly don't have an easy solution. Generally, while True: building a 
completely flowgraph and then deconstructing it to build it anew sounds 
a bit hacky (might still be the right thing to do!). What is it that you 
want to achieve?

Best regards,
Marcus

[1]https://www.gnuradio.org/blog/2017-01-05-buffers/



On 31/03/2021 01.10, Weite Zhang wrote:
> Hi,
>
> I was running a python script based on gnuradio modules. Below is a 
> simple description of what the script is trying to do:
>
> while True:
>    # create the GNURadio flowchart where the transceiver USRP is used to 
> transmit a wave that will be saved into binary files
>    my_gr = GNURadio_Top_Block()
>
>    # run the GNURadio flowchart
>    my_gr.run()
>
>    # wait until it finishes and stop
>    my_gr.stop()
>
>    # delete the created obj to release the RAM
>    del my_gr
>
> The above script will always stop and post an error by saying 
> "gr::vmcircbuf_sysv_shm: shmget (1): No space left on device" after 
> multiple iterations. I could not figure out why this is happening. Could 
> anyone give me some suggestions?
>
>
> -
> Weite

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