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Re: [Discuss-gnuradio] UHD USRP Source for B2x0 overflows File Sink

From: mleech
Subject: Re: [Discuss-gnuradio] UHD USRP Source for B2x0 overflows File Sink
Date: Thu, 07 May 2015 15:43:31 -0400
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It'll be under /usr/local/lib{64}/uhd/examples

I looked at their blurb on that drive, and its *sustained* rate comes out to about 69Mbyte/second.  Sure, it'll take bursts at screaming-fast rates, because, like the Linux kernel, it has a whacking great write-behind buffer.

Try specifying a filename of "/dev/null", which will bypass your disk subsystem entirely, and give you some idea of what you can sustain in the absence of actual disk-subsystem writes.




On 2015-05-07 15:32, Murphy, John wrote:

The sequential rates I gave are the published rates for the SSD. Maybe
(probably?) specsmanship, sure.
But since it does mostly keep up, isn't this a case of just needing
the correct buffer set-up to allow it to ride through the worst of the

I am going to have to find and figure out how to run
rx_samples_to_file before I can let you know if it makes any

- John

On Thu, May 7, 2015 at 3:07 PM,  <address@hidden> wrote:
How did you test your sequential-write rate?
Writing files that are less than the current write-behind buffer size in the kernel will give you a very false sense of how fast your disk subsystem is.
Again, if you use rx_samples_to_file, instead of GR at all, do you see any significant change in the overrun issues?
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