Thanks ron for looking into this. On Tue, Oct 6, 2015 at 3:17 PM, Ron Economos <[email protected]> wrote:
> It's actually trying to allocate 3 GBytes, which seems huge. You may not > have enough free memory. I would try to determine what change you made > that's causing such a large allocation. > > An FFT size of 2048 is still pretty small. In the DVB-T2 OFDM transmitter, > even with a 16384 FFT size, it's only using 52 MBytes of shared memory. > > Ron > > > On 10/06/2015 12:30 AM, Hitesh Kasera wrote: > > At first i tried that one only but that didn't work out. Then i tried to > set shared memory 8GB. The syntax i used the same > sudo sysctl kernel.shmmax=8589934592 but still getting the same error. > > Hitesh > > > > On Tue, Oct 6, 2015 at 10:51 AM, Ron Economos <[email protected]> wrote: > >> The correct syntax is: >> >> sudo sysctl kernel.shmmax=2147483648 >> >> for 2 Gbytes. >> >> Ron >> >> >> On 10/05/2015 10:01 PM, Hitesh Kasera wrote: >> >>> Hello everyone, >>> I am trying to implement OFDM TX in GRC but with fft length 2048. >>> according to fft length i have updated syn words, pilot carriers, pilot >>> symbols, occupied carriers. When i run the flow graph i get this 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 1536000 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 1536000 KB >>> terminate called after throwing an instance of 'std::bad_alloc' >>> what(): std::bad_alloc >>> >>> Buffer size is around 1.5GB. i tried to set kernel.shmmax to 8GB but its >>> not working. I am using Ubuntu 14.04. Kernel and GNU details are: >>> GNU Radio Companion 3.7.8rc1 >>> GNU C++ version 4.8.4 >>> UHD_003.009.git-217-g012381d9 >>> kernel release - 3.13.0-58-generic >>> kernel version - #97-Ubuntu SMP >>> >>> I am new to work with GNU Radio. I am not able to correct this error. If >>> anyone has any idea to correct this please tell me. >>> >>> Best Regards >>> Hitesh >>> >>> >>> >> _______________________________________________ >> Discuss-gnuradio mailing list >> [email protected] >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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