buffer overflow in uvfit

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bnorfolk
Posts: 45
Joined: Fri May 17, 2019 3:56 pm

buffer overflow in uvfit

Post by bnorfolk »

Hi,

I'm attempting to get a flux reading of my visibility data at 33GHz and 35GHz using uvfit but I keep receiving a buffer overflow error. I've read the previous forum post on this (https://atcaforum.atnf.csiro.au/viewtop ... rflow#p385). However, I'm running on my university's supercomputer OZSTAR and I believe memory shouldn't be an issue. Is there a way to increase the buffer limit without recompiling?

Cheers,
Brodie
ste616
Site Admin
Posts: 220
Joined: Thu Feb 04, 2010 3:27 pm
Location: Paul Wild Observatory Narrabri NSW

Re: buffer overflow in uvfit

Post by ste616 »

Hi Brodie,

No, you must recompile Miriad to change the buffer limit.

Have you tried uvsfit instead of uvfit?
cheers
Jamie Stevens
ATCA Senior System Scientist
Mark.Wieringa
ATCA Expert
Posts: 297
Joined: Mon Feb 08, 2010 1:37 pm

Re: buffer overflow in uvfit

Post by Mark.Wieringa »

Hi Brodie,

unless you are fitting sources far from the phase centre and bandwidth smearing is an issue,
it is quicker to just use the line parameter to do some spectral averaging of the data:

Code: Select all

uvfit vis=myvis object=p line=chan,200,1,10,10
You are allowed 20 million visibilities, so just average things down to get below that limit.
You can try a few settings to convince yourself it makes little difference to the result.

uvsfit has a slightly higher limit, 35 million visibilities.

Cheers,

Mark
bnorfolk
Posts: 45
Joined: Fri May 17, 2019 3:56 pm

Re: buffer overflow in uvfit

Post by bnorfolk »

Thank you both for the advice
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