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Default CTranslate2 intra threads to 1 on macOS #528

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Default CTranslate2 intra threads to 1 on macOS #528

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8 changes: 7 additions & 1 deletion argostranslate/settings.py
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Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
import json
import os
import sys
from enum import Enum
from pathlib import Path
from typing import Any, Dict
Expand Down Expand Up @@ -168,7 +169,12 @@ def set_setting(key: str, value):

# https://opennmt.net/CTranslate2/python/ctranslate2.Translator.html
inter_threads = int(get_setting("ARGOS_INTER_THREADS", "1"))
intra_threads = int(get_setting("ARGOS_INTRA_THREADS", "0"))
# On macOS no-OpenMP CTranslate2 wheels, the backend default can fan out into
# many CPU worker threads for small translation batches. Default to one backend
# compute thread on Darwin while still allowing explicit user overrides.
intra_threads = int(
get_setting("ARGOS_INTRA_THREADS", "1" if sys.platform == "darwin" else "0")
)
batch_size = int(get_setting("ARGOS_BATCH_SIZE", "32"))
compute_type = get_setting("ARGOS_COMPUTE_TYPE", "auto")
beam_size = int(get_setting("ARGOS_BEAM_SIZE", "4"))
Expand Down