Re: [Discuss-gnuradio] Running out of memory during BER simulations

[Felix W.]

That fixed it! Thanks!!

2014-11-25 18:48 GMT+01:00 Marcus Müller <address@hidden>:

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Does increasing kernel.shmmni using sysctl to let's say 16k improve
the situation?

On 11/25/2014 06:37 PM, Marcus Müller wrote:
> Hi Felix,
>
>
> On 11/25/2014 06:15 PM, Felix W. wrote:
>> Between every run, I call tb.stop() followed by tb.wait().
>> Unfortunately, after a few runs (around 20), I get the following
>> error message:
>
>> gr::vmcircbuf_sysv_shm: shmget (2): No space left on device
> I have a suspicion. First of all, I know this sounds basic, but
> you're not using a 32bit GR on your 64 bit machine, are you? (that
> would explain running out of RAM faster, just because process
> memory is so very limited for 32bit processes)
>
> then: vmcircbuf is one of the things I always was kind of hesitant
> to touch (or even try to understand in depth), just because it
> deals with a lot of POSIX/OS specifics that I'm not an expert in,
> but:
>
> Maybe tb.stop()/wait doesn't actually successfully unmap the
> shared memory segments of the buffers; there's a global maximum of
> segments, and it 4096 by default (/proc/sys/kernel/shmmni).
> However, this shouldn't be the problem at hand: there's an error
> number for this condition. And it would be: ENOSPC. Great. The same
> thing as for "No space left on device"; Thank you, Posix.1...
>
> Cheers, Marcus
>
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