Doug, Thanks I'll try this. Googling a bit more I think fwrite has to be thread safe, I'll double check my setup again and have another think if this doesn't help.
Cheers, Tim On Thu, Nov 19, 2009 at 7:17 PM, Doug Geiger <douglas.gei...@nrl.navy.mil>wrote: > Tim Pearce wrote: > >> Hi Guys, >> >> After experimenting a bit more I think the issue was my test setup. >> >> Previously I was using python to setup a USRP Source (with timestamps) and >> save both the samples (64 bit) and timestamps (32bit) to a file sink to >> process by importing with numpy and checking timestamps later. >> >> At 25MHz thats ~ 300MB/sec of data, which is substantially more than >> machines disk, which is probably about 20MB/sec max. >> > Don't have a good answer on the thread-safety question - but one method > I've used when I want to collect a bunch of data for a limited period of > time is mount a ram disk/tmpfs. E.g. I'd do something like: > $ mkdir /tmp/shm > $ sudo mount -t tmpfs tmpfs /tmp/shm > $ usrp2_rx_cfile -e <interface> -f <frequency> -N <big number here> > /tmp/shm/data.dat > > Cheers, >> >> Tim >> > Doug > > -- > Douglas Geiger > Code 5545 > U.S. Naval Research Laboratory > Washington, DC 20375 > (202) 767-9048 > douglas.gei...@nrl.navy.mil > >
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