5. Issues and Limitations

5.1. Memory Issues

Some primitives use a lot of RAM memory and they can cause a crash. Memory management in Python is notoriously difficult. The DRAGONS’s team is constantly trying to improve memory management within astrodata and the DRAGONS recipes and primitives. If an “Out of memory” crash happens to you, if possible for your observation sequence, try to run the pipeline on fewer images at the time, like for each dither pattern sequence separately.

Then to align and stack the pieces, run the alignAndStack recipe:

$ reduce @list_of_stacks -r alignAndStack

5.2. Double messaging issue

If you run the Reduce API without setting up a logger, you will notice that the output messages appear twice. To prevent this behaviour set up a logger. This will send one of the output stream to a file, keeping the other on the screen. We recommend using the DRAGONS logger located in the gempy.utils.logutils module and its ~gempy.utils.logutils.config() function:

from gempy.utils import logutils
logutils.config(file_name='gsaoi_data_reduction.log')