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Add prepare_sim.Nthread_per_load parameter #145

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Sep 21, 2024
Merged

Add prepare_sim.Nthread_per_load parameter #145

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bd73f7c
Add prepare_sim.Nthread_per_load parameter
lgarrison Jul 26, 2024
4723bcc
use integer division
lgarrison Jul 26, 2024
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11 changes: 8 additions & 3 deletions abacusnbody/hod/prepare_sim.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1094,9 +1094,14 @@ def main(
else:
shearmark = None
# N_dim = config['HOD_params']['Ndim']
nthread = int(
np.floor(multiprocessing.cpu_count() / config['prepare_sim']['Nparallel_load'])
)
nthread = config['prepare_sim'].get('Nthread_per_load', 'auto')
if nthread == 'auto':
nthread = (
len(os.sched_getaffinity(0)) // config['prepare_sim']['Nparallel_load']
)
print(f'prepare_sim inferred Nthread_per_load = {nthread}')
else:
nthread = int(nthread)

p = multiprocessing.Pool(config['prepare_sim']['Nparallel_load'])
p.starmap(
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3 changes: 2 additions & 1 deletion scripts/hod/config/abacus_hod.yaml
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Expand Up @@ -13,7 +13,8 @@ sim_params:
cleaned_halos: True # load cleaned halos?

prepare_sim:
Nparallel_load: 5 # number of thread for organizing simulation outputs (prepare_sim)
Nparallel_load: 5 # number of processes. peak memory usage will increase by this factor.
Nthread_per_load: 'auto' # number of threads per process (auto uses the affinity mask)

# HOD parameters
HOD_params:
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1 change: 1 addition & 0 deletions scripts/hod/config/lc_hod.yaml
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Expand Up @@ -14,6 +14,7 @@ sim_params:

prepare_sim:
Nparallel_load: 1 # not sure if this makes a difference since we have a single slab
Nthread_per_load: 'auto'

# HOD parameters
HOD_params:
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