DM-9926: reduce memory footprint of meas_mosaic #7
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Reading the calexp is slow, uses excessive memory and unnecessary: * the detector is available from the camera (no need to worry about cameras that don't index camera by dataId["ccd"]: we're only supporting HSC) * the dimensions of the image are available from the calexp_md. This is a little dirty, but it's used elsewhere in this file and we only expect to have to support meas_mosaic a little longer.
Probably not important here, but good practice in general because it guards against memory fragmentation.
We do this in two ways: 1. Use Pool with maxtasksperchild=1. This stops memory fragmentation from compounding, because although memory may be fragmented in each process, after each read the process exits and is replaced with a fresh slate. 2. Join the pool when done. This stops a bunch of python processes from hanging around when iterating over tracts in a single job.
PaulPrice
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