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fix(ngmix): release FitModel observations after each metacal fit #843

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Merged
cailmdaley merged 1 commit into from
Jul 16, 2026
+14 −0
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fix(ngmix): release FitModel observations after each metacal fit #843

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14 changes: 14 additions & 0 deletions src/shapepipe/modules/ngmix_package/ngmix.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1630,4 +1630,18 @@ def do_ngmix_metacal(
)
resdict, obsdict = boot.go(gal_obs_list)
psf_res = average_multiepoch_psf(obsdict)
del obsdict

# Each FitModel in resdict retains the full metacal observations
# (``.obs``, a plain attribute set by FitModel._set_obs) plus the pixel
# arrays derived from them (``._pixels_list``) — several MB per object.
# Results accumulate until the SAVE_BATCH flush, and compile_results
# reads only scalar dict keys, so release the arrays now to keep
# resident memory flat.
for _fm in resdict.values():
if hasattr(_fm, 'obs'):
_fm.obs = None
if hasattr(_fm, '_pixels_list'):
_fm._pixels_list = None

return MetacalResult(resdict=resdict, reconv=psf_res, orig=psf_orig_res)
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