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From: | Marcus D. Leech |
Subject: | Re: [Discuss-gnuradio] Getting overflows at 50 Msps (not sure why) |
Date: | Wed, 04 Jun 2014 17:21:25 -0400 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.24) Gecko/20111108 Fedora/3.1.16-1.fc14 Thunderbird/3.1.16 |
On 06/04/2014 05:16 PM, Orin Lincoln wrote:
What is causing the problem is that your computer/OS simply cannot keep up. Gnu Radio has noticeably more overhead than a hand-crafted program like benchmark_rate. Being able to maintain real-time streaming at these rates is *challenging*, and just because benchmark_rate doesn't fall over, is *zero* guarantee that some *other* program, trying to swallow data at a similar rate, will actually be able to.Hello,I am trying to get samples from a B200 at 50 Msps into GNU Radio. The UHD benchmark_rate tool receives at 50 Msps without any overflows detected. My GNU Radio flowgraph is simply a USRP source connected to a null sink, and I'm still getting overflows. I've tried expanding the min_output_buffer for the USRP source, but that doesn't seem to help. I really don't know what is causing the problem. Any suggestions about what I should try?Thank you, Orin Lincoln _______________________________________________ Discuss-gnuradio mailing list address@hidden https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Desktop/Server operating systems (Windows, OSX, Linux, *BSD) aren't really optimized for dealing with high-bandwidth real-time flows. In any given system configuration, it's rather a crap-shoot as to whether your system will be able to keep up or not.
What type of computer do you have? What OS? How much memory? Is it the fastest memory you can use on your motherboard?
-- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org
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