If you want high file-write performance, leave it in buffered mode.
Also, a 175-tap filter, running at 16Msps is going to chew up a lot of CPU. How about a simple low-pass filter, decim=2? Make the transition bandwidth fairly sloppy. On 2015-05-07 12:48, Murphy, John wrote: > How would I best set up a UHD Source block for USRP B2x0 devices to > output to a flowgraph that uses a File Sink block to write to disk > without overflows (and how would I best set up the File Sink block)? > > This is the attached system hardware, dedicated to GR... > Gigabyte GB-BXi7-4770R Brix Pro PC > Crucial Ballistix Sport 2x8=16GB RAM DDR3L-1600 (PC3L-12800) CL9 Timing > 9-9-9-24 > Samsung 840 EVO 250GB SATA-III internal 2.5" SSD > ...so a lot of overkill on hardware resources, but no knowledge on how > to set up the UHD Source block or File Sink block to take advantage of > this. > > I am attempting to record data at 16Ms/s on the USRP and 8Ms/s to the > disk but I would like to take this even higher (perhaps as high as 28 > Ms/s on the USRP or as fast as I can get it) if possible with a fast > enough system. > > Fedora 20 with LXDE (uname -r is 3.18.9-100.fc20.x86_64) > UHD is 3.8.1 > GR is 3.7.6.1 > > My flowgraph has: > a. UHD USRP Source with master clock 32M, sample rate 16M, wire format > auto, output type complex float32, and a device argument of > num_recv_frames=512. > b. Polyphase Decimator with decim 2, 175 taps from > firdes.low_pass_2(), FFT rotator and filters. > c. Constant multiply by 32768 with type complex. > d. Complex to IShort with vector output yes. > e. File Sink with input type short, vector length of 2, unbuffered on > (there's a confusing parameter name, which I am not sure actually does > anything), and append file overwrite. > > Thanks, > - John > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio [1] Links: ------ [1] https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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