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

[Matt Ettus]

> 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
> controller.


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.

Matt