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hi Eskil,</div>
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I also reported an issue in 2.8.1 when using zoom bands a couple months back. I didn't get a chance to pursue it due to other pressing matters, and our correlator hardware is currently offline, but it is likely we are seeing the same issue. I've attached the
issue I described to the foot of this message.</div>
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Regards,</div>
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Cormac.<br>
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[forwarded message]<br>
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<font size="2"><span style="font-size:11pt" class="ContentPasted0">hello again developers,<br class="ContentPasted0">
<br class="ContentPasted0">
in further testing of the newly released DiFX-2.8.1 I appear to have come across another case of missing subbands. This time in cross correlations rather than autos, but it otherwise looks remarkably similar to the problem I was seeing in DiFX-2.8 before Walter's
fix - e.g. I only see the problem when using zoom bands and mixed modes. The same data correlate fine under DiFX-2.6.3. Also the input files for DiFX-2.8.1 seem to be correct, suggesting it is again an mpifxcorr issue.<br class="ContentPasted0">
<br class="ContentPasted0">
I attach 2 plots to demonstrate the difference. The first (v622-tst2) shows the spectra from AIPS with DiFX-2.6.3 and the second from DiFX-2.8.1 (v622-tst). Half the subbands on the MP-CD baseline are missing in the DiFX-2.8.1 version. All subbands are present
on AT-CD and AT-MP baselines.<br class="ContentPasted0">
<br class="ContentPasted0">
Unfortunately I'm about to disappear on leave for two weeks so haven't had a chance to pursue this as far as I would like, but I thought to share it with the brains trust now, especially given the similarity with the recently solved bug. The minimum example
is available here:<br class="ContentPasted0">
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<a href="https://cloudstor.aarnet.edu.au/plus/s/iSZLdIDRHsKspB2" target="_blank" rel="noopener noreferrer" data-auth="NotApplicable" id="OWA4df47928-56d9-aff1-ee4c-3186eba45a28" data-linkindex="0" class="OWAAutoLink ContentPasted0">https://cloudstor.aarnet.edu.au/plus/s/iSZLdIDRHsKspB2</a>
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v622a is publicly shared</div>
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cloudstor.aarnet.edu.au</div>
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that should contain everything required to re-create the problem including the baseband data if you are really keen.<br class="ContentPasted0">
<br class="ContentPasted0">
Let me know if other info is useful.<br class="ContentPasted0">
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Difx-users <difx-users-bounces@listmgr.nrao.edu> on behalf of Adam Deller via Difx-users <difx-users@listmgr.nrao.edu><br>
<b>Sent:</b> Sunday, 13 August 2023 19:02<br>
<b>To:</b> Eskil Varenius <eskil.varenius@chalmers.se><br>
<b>Cc:</b> difx-users@nrao.edu <difx-users@nrao.edu><br>
<b>Subject:</b> Re: [Difx-users] Lack of mixed-mode fringes with 2.6.3, then segfault with 2.8.1? {External} {External}</font>
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<div dir="ltr">Hey Eskil,
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<div>Have you tried vex2difx -v -v and/or valgrind vex2difx to see where the segfault is occurring? Obviously, it shouldn't be segfaulting, so presumably finding that and fixing it should go a fair way towards solving the problem.</div>
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<div>Cheers,</div>
<div>Adam</div>
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<div dir="ltr" class="x_gmail_attr">On Sat, 12 Aug 2023 at 04:22, Eskil Varenius via Difx-users <<a href="mailto:difx-users@listmgr.nrao.edu">difx-users@listmgr.nrao.edu</a>> wrote:<br>
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<p class="x_MsoNormal">Dear Difx-users,<u></u><u></u></p>
<p class="x_MsoNormal"><u></u> <u></u></p>
<p class="x_MsoNormal">Background: I have mixed-mode continuum data from 3 stations: Ns(16 MHz VDIF), Ny(16 MHz M5B), Nn 32 MHz VDIF). Ns and Ny observe standard S/X with R-pol only, and Nn (VGOS) observe dual linear X/Y (strictly speaking H/V but I'm using
X/Y here since that's the VEX labels). Correlating Ns-Ny baseline with DiFX 2.6.3, is all good. I use zoom windows (to get 16 MHz from all stations) and FreqId selection (to only correlate X-band and skip S-band channels). But when trying to correlate all
three stations I run into problems. <u></u><u></u></p>
<p class="x_MsoNormal"><u></u> <u></u></p>
<p class="x_MsoNormal">Problem 1: With DiFX 2.6.3 I can correlate all three stations, and then run difx2mark4. Fourfit then gives me nice fringes on the Ns-Ny baseline (R-R pol), and the Ns-Nn baseline (RX and RY pol). But while I do get nice XR fringes on
the Nn-Ny baseline, I do not get any YR fringes on this baseline. I know the data are good, since I get fringes to these polarisations on another baseline. So I suspect I have fallen into the "Warning: Limited support for mixed-mode..." here, or do you have
other suggestions? <u></u><u></u></p>
<p class="x_MsoNormal"><u></u> <u></u></p>
<p class="x_MsoNormal">I saw there are improvements for mixed-mode in DiFX 2.8.1, so I decided to try it, but:<u></u><u></u></p>
<p class="x_MsoNormal"><u></u> <u></u></p>
<p class="x_MsoNormal">Problem 2: With DiFX 2.8.1, I get "segfault" when I run <span lang="EN-US">
”</span>vex2difx<span lang="EN-US">” (this worked with 2.6.3)</span>. Any ideas?<u></u><u></u></p>
<p class="x_MsoNormal"><u></u> <u></u></p>
<p class="x_MsoNormal">I guess hunting the "segfault in 2.8.1" is the most profitable route for the future? If so, please let me know what info you may need to speculate further. I am happy to share output, v2d, vex, and even raw data for one scan for someone
to reproduce this if you would be so kind to help.<u></u><u></u></p>
<p class="x_MsoNormal"><u></u> <u></u></p>
<p class="x_MsoNormal">I am very puzzled by this!<u></u><u></u></p>
<p class="x_MsoNormal"><u></u> <u></u></p>
<p class="x_MsoNormal">Kind regards<u></u><u></u></p>
<p class="x_MsoNormal">Eskil<u></u><u></u></p>
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<div dir="ltr" style="font-size:12.8px">!=============================================================!<br>
<div dir="ltr" style="font-size:12.8px">Prof. Adam Deller </div>
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<div style="font-size:12.8px">Centre for Astrophysics & Supercomputing </div>
<div dir="ltr" style="font-size:12.8px">Swinburne University of Technology <br>
John St, Hawthorn VIC 3122 Australia</div>
<div style="font-size:12.8px">phone: +61 3 9214 5307</div>
<div style="font-size:12.8px">fax: +61 3 9214 8797</div>
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