[Difx-users] Multi-thread 4-bit VDIF fails with 'vdifmux() failed with return code -2014' {External} {External} {External}

[Adam Deller]

I agree that a data sample is needed to properly assist (or the output of
printVDIF or similar might already help too - basically a summary of what
is in the headers). My initial guess is an issue with either the threadIDs
or the number of channels per thread that is being placed in the VDIF
header.

Cheers,
Adam

On Fri, 21 Feb 2025 at 03:03, Walter Brisken via Difx-users <
difx-users at listmgr.nrao.edu> wrote:

> Hi Jake,
>
>
> It would be most useful if you could make available the .input file and a
> sample of the VDIF stream (perhaps a couple to a couple hundred MB made
> available through http) that you are dealing with.  The .vex file is also a
> useful source of info if that can be shared.
>
>
> Cheers,
>
>
> Walter
>
>
> On 2/20/25 05:12, Jacob Brooks via Difx-users wrote:
>
> Hi all,
>
> We're currently trying to get DiFX working with the following setup:
> 4-bit, 2 channel (L + R pols), 2 threads (2 subbands), delivered in real
> time via UDP. It has been working fine up until the point where we tried
> adding a second thread - single-thread VDIF has been working for us.
>
> When running in multi-threaded mode, the datastream processes crash with
> the following message:
>
> 'vdifmux() failed with return code -2014, likely input buffer is too
> small!'
>
> I have managed to trace the problem to a check in 'getLowestFrameNumber'
> in vdifio/src/vdifmux.c. The inequality check in that function:
>
> 'getVDIFNumChannels(vh) != vm->inputChannelsPerThread'
>
> succeeds as the function returns a value of 2 while
> 'inputChannelsPerThread' has a value of 1. This happens for every iteration
> so vdifmux() fails and returns a -2014 error code.
>
> I'm not sure where to go from here and was hoping someone more familiar
> with DiFX could help out. Hopefully I'm not missing something obvious! If
> you need any more information I haven't provided please do ask.
>
> Cheers,
> Jake
>
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-- 
!=============================================================!
Prof. Adam Deller
Centre for Astrophysics & Supercomputing
Swinburne University of Technology
John St, Hawthorn VIC 3122 Australia
phone: +61 3 9214 5307
fax: +61 3 9214 8797
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