Re: [Discuss-gnuradio] Memory allocation issue

[Jeff Long]

Ron,

See if you can set kernel.shmmax to something higher. You can check the 
current value with

  sysctl kernel.shmmax

See sysctl(8).

Jeff

On 10/21/2014 04:12 PM, Ron Economos wrote:
> I'm writing a block that requires a large amount of data to be processed
> in one iteration of the work function. If I call set_output_multiple()
> with 8100 * 130 = 1053000 items (of gr_complex), I get the following error:
>
> gr::vmcircbuf_sysv_shm: shmget(1): Invalid argument
> gr::vmcircbuf_sysv_shm: shmget(1): Invalid argument
> gr::vmcircbuf_sysv_shm: shmget(1): Invalid argument
> gr::buffer::allocate_buffer: failed to allocate buffer of size 16456 KB
> gr::vmcircbuf_sysv_shm: shmget(1): Invalid argument
> gr::vmcircbuf_sysv_shm: shmget(1): Invalid argument
> gr::vmcircbuf_sysv_shm: shmget(1): Invalid argument
> gr::buffer::allocate_buffer: failed to allocate buffer of size 16456 KB
> terminate called after throwing an instance of 'std::bad_alloc'
>    what():  std::bad_alloc
>
>
> I realize that 16 Megabytes is a little large, but not astronomical.
> The set_output_multiple() function does work fine with 8100 * 129
> = 1044900 items (of gr_complex).
>
> Is this some hard limitation in the shared memory library, or can it be
> overridden somehow?
>
> best regards,
> Ron
>
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