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Re: [Discuss-gnuradio] Data lost whe using big file sources
From: |
Martin Braun |
Subject: |
Re: [Discuss-gnuradio] Data lost whe using big file sources |
Date: |
Tue, 10 Apr 2012 13:09:24 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
Hi Bogdan,
On Tue, Apr 10, 2012 at 03:48:11AM -0700, Bogdan Diaconescu wrote:
> Hello gnuradio fellows,
>
> I have an issue that appears in all gnuradio versions I used lately (I
> started with 3.3 and last week I updated to latest from git) and I thought I
> should post here before allocating the time to look into it by myself.
>
> I'm modifying a gnuradio block that is connected from python to 6 file
> sources. Everything works fine as long as the files I'm using as source for
> data are relatively small (30MB). When the files become large I see that the
> data received in general_work() function is corrupted. It is not massively
> corrupted but enough to screw my work.
I've seen this behaviour, too. My workaround was to use a throttle block
after noticing that my code works with USRPs, but not with files.
However, I never managed to trace the bug to the file source. Thanks for
this!
> Investigating the problem, I did a small test with having the 6 files filled
> with known patterns and printing an error in the general_work() if what is
> received is different. The result is that if I use files with sizes over
> 100MB I see 50-80 errors in total.
Do you have errors, or are samples missing?
> Now, to unblock my work I did observe that if I insert some printing in
> general_work() I will not get the errors. Going further, inserting a boost
> delay of 100uS also solves the problem.
>
> some more data:
> 1. I know the new blocks should use work() instead of general_work() but is
> it still supposed to work as long as I call consume_each(), right?
That should work since general_work() calls work() and then
consume_each(). Have a look at the code of gr_block (or was it
gr_basic_block?)
MB
--
Karlsruhe Institute of Technology (KIT)
Communications Engineering Lab (CEL)
Dipl.-Ing. Martin Braun
Research Associate
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Building 05.01
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KIT -- University of the State of Baden-Württemberg and
National Laboratory of the Helmholtz Association
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