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INDI Library v2.0.6 is Released (02 Feb 2024)

Bi-monthly release with minor bug fixes and improvements

A better FITS viewer?

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Thanks for pointing out that about fitsviews. I was not suggesting that all be separated from Ekos, just that the fitsviewer might run in its own process or thread.

But anyway, I have not looked for any Linux FITS viewers out there. Perhaps this link is a good start? fits.gsfc.nasa.gov/fits_viewer.html
Ubuntu 18.04 and Raspbian Jessie; INDI 1.7.4
Mounts: CEM-60 chiefly; iEQ45
Cameras: Atik 383L+, QHY5-II-M
Focuser: Moonlite
4 years 7 months ago #42253

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Replied by Alfred on topic A better FITS viewer?

I see you're running Ubuntu 18.04. Gwenview will display all sorts of image files, .fits included.
4 years 7 months ago #42259

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It absolutely is. And especially for viewing astronomy fits files be sure to look at DS9 (IMHO).
4 years 7 months ago #42273

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Replied by Odiug on topic A better FITS viewer?

Unfortunately there are not many FITS viewers that display color FITS from INDI. E.g. DS9 only displays grey values and does not recognize the bayer information in the header. Or am I missing something?

BTW, I did not experience a crash with the INDI Fits Viewer yet. But I only have a ZWO ASI 224mc with a small sensor (1304x976). That would also hint at a memory issue, but Jasem already said he had fixed it...

Guido
4 years 7 months ago #42298

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Replied by Alfred on topic A better FITS viewer?

4 years 7 months ago #42325
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Replied by Odiug on topic A better FITS viewer?


OK, now that I bought a ZWO ASI 294mc pro, I'll take this back!
I now also experience frequent crashes with displaying pictures of the new camera (11MP, 4144x2822) in Fits Viewer : often when applying Auto Stretch and reproducable when zooming in.

Is there anything I can do to help debugging?
KStars version: 3.3.8 build: 2019-11-16T00:06:30Z
running under Astroberry on a Pi3.

CS
Guido
4 years 4 months ago #45907

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Replied by Jasem Mutlaq on topic A better FITS viewer?

Can you run it via gdb and post the backtrace?

gdb -ex run --args kstars
4 years 4 months ago #45926

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Replied by Odiug on topic A better FITS viewer?

Unfortunately I get a SIGSEGV immediatly at startup:
astroberry@astroberry:~$ gdb -ex run --args kstars
GNU gdb (Ubuntu 7.11.1-0ubuntu1~16.5) 7.11.1
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "arm-linux-gnueabihf".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from kstars...Reading symbols from /usr/lib/debug/.build-id/2f/f06cd9509561a1816cfb4441a4f165c88c4c5b.debug...done.
done.
Starting program: /usr/bin/kstars 
 
Program received signal SIGSEGV, Segmentation fault.
0x76fd9dde in ?? () from /lib/ld-linux-armhf.so.3
(gdb) 

Without gdb KStars used to work normally.
Any idea what is causing the gdb debugging to fail?

Regards
Guido
4 years 4 months ago #45985

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Replied by Odiug on topic A better FITS viewer?

Just looked at "top" when I ran KStars on my PC (instead of the Pi3).
When zooming in to 400% in the Fits Viewer, the RES column in top exceeds 2GB. That would probably easily explain KStars crashing on the Pi.
The Pi does not really use any swap, just /dev/zram0, an in memory ram disk with compression, I assume.

However it also sometimes crashes when just using Auto Stretch with full Ekos running. Maybe it is also already low on memory.

Still it should not crash but check and handle any memory issues.

Maybe, I should go for a Pi4 with 4GB soon.

Regards
Guido
4 years 4 months ago #45987

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Replied by Rob Lancaster on topic A better FITS viewer?

You can check how the pi is on memory. I have a program called conky running on mine always reporting the memory used (along with lots of other stuff) so that I know if there is an issue
4 years 4 months ago #45988

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Replied by Jasem Mutlaq on topic A better FITS viewer?

Yesterday, I performed a test with StellarMate over hotspot. Connected ZWO and Toupcam camera. Went to perform guide looping with ZWO and began a sequence of 500 images for Toupcam, each 10 seconds long. I left it for the night. This morning I checked it and it was still looping without any errors for the last 10 hours. All 500 images captured and saved, and memory consumption was at 1.74GB. It is possible there might due a memory leak from elsewhere... but I cannot reproduce that now.
4 years 4 months ago #46009

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Replied by Odiug on topic A better FITS viewer?

Astroberry uses swapping to a compressing RAM disk (maybe the default for Ubuntu Mate). That might be helpful when unused program parts are put away in a compressed form to provide more memory for active programs. But I think it is not a good idea when memory is already scarce.

I am using a swapfile now with swappiness set to 0 (only swap when absolutely necessary). On zooming in FITS Viewer the Pi did become very slow, as expected due to swapping to sd-card, but KStars FITS Viewer did not crash yet.

What you have to do:
$ sudo apt install dphys-swapfile

You can configure it in /etc/dphys-swapfile, but default settings seem to be OK. It will use a 2GB swapfile (Maybe too big. I guess the Pi will become unusable before this is fully used)
Set swappiness to 0 by adding "vm.swappiness = 0" to the end of /etc/sysctl.conf.

Regards
Guido
4 years 4 months ago #46052

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