On Tue, Aug 2, 2011 at 8:19 PM, Marcus D. Leech <mle...@ripnet.com> wrote: > On 08/02/2011 08:11 PM, Tom Rondeau wrote: >> >> On Mon, Aug 1, 2011 at 10:24 AM, Jason Thomas<jtho...@islinc.com> wrote: >>> >>> I am trying to record data directly from a UDP stream to file. I have >>> four >>> channels at 1.2MHz sample rate the code is below. Basically it opens a >>> UDP >>> source and connects to a file sink. However, It is losing data when >>> writing >>> to the file. If I stream a signal with a one second burst the spacing is >>> not >>> correct. Also, I have another c++ program that reads the UDP packets and >>> records directly to file, and there are no lost UDP packets nor lost data >>> with this program. Also I have checked that the UDP packet size is less >>> than >>> 1472, it is currently at 1024 bytes. >>> >>> Is there a way to see if file_sink is not able to handle that data rate, >>> or >>> to see if the UDP source cannot keep up? >> >> It's most likely that your disk is not able to keep up. I've used GNU >> Radio's file sink to save gigabytes of data at 25 MHz float I&Q, but I >> used a RAID5 device to do it. You probably need more spindles. >> >> Tom >> >> > Tom: > > It's not strictly disk-limited, since Jason observes that with a non-Gnu > Radio program, he can record direct to disk from > the raw UDP stream, and not lose anything.
Ah, I misread that. In my mind, he said something else... Still, I've never had an issue with the file sinks. More data is required. Tom > -- > Marcus Leech > Principal Investigator > Shirleys Bay Radio Astronomy Consortium > http://www.sbrac.org _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
