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Re: [Discuss-gnuradio] GRC's graphical sinks performance issues

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] GRC's graphical sinks performance issues
Date: Wed, 01 Sep 2010 21:52:51 -0700
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20100720 Fedora/3.0.6-1.fc12 Thunderbird/3.0.6

P.S. - My configuration: I'm using the latest gnuradio source code along
with a USRP2 and a WBX board, decimation is at 4, the FFT Sink's bin size is
set at 2048 and its sampling rate is at 1,000,000. The computer is a
Thinkpad X61s with a Core2Duo 1.6GHz processor and an Intel GM965 graphics

This is where your problem is. If you are using decimation of 4 then you are sending 25 million samples per second to the display. However, you are telling it that its sample rate is 1 Million. Thus you are giving it 25 times as many samples per second as it expects. Tell it to expect 25 MS/s and you won't have any problem.


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