Hello,
I have a simple application written in Python using GNURadio. All I am trying to accomplish is to have the USRP data be written to disk. The application works fine when I dump data to /dev/null or run it at reduced sampling rates. However, when I run at my desired sampling rate, I have a good amount of buffer overflows (a series of "O" characters get printed).
The host machine that I am working on should have no problems sampling at the higher rates, but I have found a curious issue in that not a whole lot of memory is used up by my GNURadio application.
As a result, I am wondering if there is any way to tell GNURadio to use larger buffers (on the order of a few GB) in order to prevent data from being dropped. I noted that there seem to be several function calls available in the C++ API, but there seems to be a limited set of these calls in the Python wrappers. Latency is a non-issue for me at the moment, but I need to capture all the data without dropping a large amount of data. Note that I have the code running with "real-time" priorities in Linux.
Thanks for your help. FYI I am running GNURadio on Ubuntu 14.04. Also, I know that my RAID set-up is capable of writing to disk at twice the rate of data coming in per benchmarking the HDDs.