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]
<mailto:[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
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