taskGNU Astronomy Utilities - Tasks: task #13759, Decrease memory usage


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task #13759: Decrease memory usage

Submitted by:  Mohammad Akhlaghi <makhlaghi>
Submitted on:  Sat 03 Oct 2015 06:14:20 AM UTC  
Should Start On: Fri 02 Oct 2015 03:00:00 PM UTCShould be Finished on: Fri 02 Oct 2015 03:00:00 PM UTC
Category: MakeCatalogPriority: 5 - Normal
Item Group: EnhancementStatus: None
Privacy: PublicPercent Complete: 0%
Assigned to: NoneOpen/Closed: Open
Effort: 0.00

Wed 23 Mar 2016 05:37:18 AM UTC, comment #2:

The first pass and second pass functions until now also did some post-processing. For example dividing the brightness weighted positions by the total brightness. This is now done while calculating the final columns.

So now the first pass and second pass functions only actually pass through the pixels and don't do any processing. This will later allow us to easily parallelize the process, for example, only reading part of the image, getting all the raw information we need and then freeing that space in parallel. This can greatly decrease the memory usage and (maybe, possibly not!) increase speed. In some cases, memory is more important than speed.

Mohammad Akhlaghi <makhlaghi>
Project Administrator
Fri 19 Feb 2016 07:45:49 AM UTC, comment #1:

task #13900 was defined as a more general solution/infrastructure for any Gnuastro utility that has similar memory problems on large images.

Mohammad Akhlaghi <makhlaghi>
Project Administrator
Sat 03 Oct 2015 06:14:20 AM UTC, original submission:

MakeCatalog currently needs to load a lot of data before starting. In the case of large images, this can easily be felt.

One big step is to make NoiseChisel store the Sky and Sky Standard deviation values on the mesh grid (one pixel per grid) as it does internally. And configure MakeCatalog to read that kind of Sky and Sky standard deviation too.

Mohammad Akhlaghi <makhlaghi>
Project Administrator


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