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Merged
merged 2 commits into from
Sep 24, 2025
Merged

mpl: ensure number of perturbations increase for large arrays #8411

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mpl: ensure number of perturbations increase for large arrays
AcKoucher Sep 23, 2025
ce521c1
Merge branch 'master' into mpl-perturbations
AcKoucher Sep 24, 2025
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16 changes: 9 additions & 7 deletions src/mpl/src/hier_rtlmp.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2097,11 +2097,13 @@ void HierRTLMP::placeMacros(Cluster* cluster)

const int number_of_sequence_pair_macros
= static_cast<int>(hard_macros.size());
const int minimum_perturbations_per_step = num_perturb_per_step_ / 10;
const bool large_macro_cluster
= number_of_sequence_pair_macros > minimum_perturbations_per_step;

int num_perturb_per_step
= (number_of_sequence_pair_macros > num_perturb_per_step_ / 10)
? number_of_sequence_pair_macros
: num_perturb_per_step_ / 10;
int perturbations_per_step = large_macro_cluster
? number_of_sequence_pair_macros
: minimum_perturbations_per_step;

SequencePair initial_seq_pair;
if (cluster->isArrayOfInterconnectedMacros()) {
Expand All @@ -2114,8 +2116,8 @@ void HierRTLMP::placeMacros(Cluster* cluster)
exchange_swap_prob = 1.0f;

// Large arrays need more steps to properly converge.
if (number_of_sequence_pair_macros > num_perturb_per_step) {
num_perturb_per_step *= 2;
if (large_macro_cluster) {
perturbations_per_step *= 2;
}
}

Expand Down Expand Up @@ -2151,7 +2153,7 @@ void HierRTLMP::placeMacros(Cluster* cluster)
exchange_swap_prob,
init_prob_,
max_num_step_,
num_perturb_per_step,
perturbations_per_step,
random_seed_ + run_id,
graphics_.get(),
logger_,
Expand Down