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cache rate index to avoid lookup in form_matrix loop #3884

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cache rate index to avoid lookup in form_matrix loop #3884

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9 changes: 6 additions & 3 deletions openmc/deplete/chain.py
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Original file line number Diff line number Diff line change
Expand Up @@ -641,6 +641,9 @@ def setval(i, j, val):
if fission_yields is None:
fission_yields = self.get_default_fission_yields()

_index_nuc = rates.index_nuc
_index_rx = rates.index_rx

for i, nuc in enumerate(self.nuclides):
# Loss from radioactive decay
if nuc.half_life is not None:
Expand Down Expand Up @@ -671,14 +674,14 @@ def setval(i, j, val):
count = decay_type.count('p')
setval(k, i, count * branch_val)

if nuc.name in rates.index_nuc:
if nuc.name in _index_nuc:
# Extract all reactions for this nuclide in this cell
nuc_ind = rates.index_nuc[nuc.name]
nuc_ind = _index_nuc[nuc.name]
nuc_rates = rates[nuc_ind, :]

for r_type, target, _, br in nuc.reactions:
# Extract reaction index, and then final reaction rate
r_id = rates.index_rx[r_type]
r_id = _index_rx[r_type]
path_rate = nuc_rates[r_id]

# Loss term -- make sure we only count loss once for
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