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Re: [Discuss-gnuradio] Streaming IQ File Compression


From: Dan CaJacob
Subject: Re: [Discuss-gnuradio] Streaming IQ File Compression
Date: Sat, 16 Jul 2016 04:34:01 +0000

You'll likely have to buffer the output to a ramdisk and then slowly bleed that to the disk.  Compression typically doesn't work well on IQ data unless you've got a structured signal in there.  If there's a lot of white noise, you won't get much compression

On Sat, Jul 16, 2016 at 12:00 AM Dave NotTelling <address@hidden> wrote:
Anyone have experience with streaming 100+ MSPS of 16 bit IQ data through a compression tool and then to disk?  I'd like to be able to take really wide band snaps for several minutes.  Currently that would take up 16 * 2 * SAMP_RATE bits per second.  So, for 200 MSPS that would end up being 800 MBytes/s.  That rate eats up a hard drive pretty quickly.  Running it through gzip by way of pigz was my first thought, but even on an 8 core Intel machine pigz just can't keep up.  I can sustain maybe 300 MBytes/s but that's it.  And I know it's not a hard disk limitation as the M.2 drive I am using can easily sustain 800 MBytes/s of uncompressed data.

Thoughts?

Thank you!


-Dave
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Very Respectfully,

Dan CaJacob

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