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First attempt on constraining CPU load

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This commit is contained in:
Tomas Kracmar
2025-09-08 18:54:30 +02:00
parent 0603817743
commit 51e1ff3dc8
1 changed files with 13 additions and 1 deletions
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14
app/worker.py
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@@ -24,6 +24,17 @@ WHISPER_DEVICE = os.getenv("WHISPER_DEVICE", "auto").strip()
WHISPER_DEVICE_INDEX = int(os.getenv("WHISPER_DEVICE_INDEX", "0"))
WHISPER_CPU_THREADS = int(os.getenv("WHISPER_CPU_THREADS", "4"))
# --- Host load guards / thread limits ---
# Limit ffmpeg threads (helps keep CPU in check when multiple workers run)
FFMPEG_THREADS = int(os.getenv("FFMPEG_THREADS", "1"))
# Tame BLAS/threadpools that libraries may spin up implicitly
import os as _os_threads
_os_threads.environ.setdefault("OMP_NUM_THREADS", str(WHISPER_CPU_THREADS))
_os_threads.environ.setdefault("OPENBLAS_NUM_THREADS", "1")
_os_threads.environ.setdefault("MKL_NUM_THREADS", "1")
_os_threads.environ.setdefault("NUMEXPR_NUM_THREADS", "1")
# Whisper logging & resume controls
WHISPER_LOG_SEGMENTS = os.getenv("WHISPER_LOG_SEGMENTS", "1") not in ("0", "false", "False")
WHISPER_RESUME = os.getenv("WHISPER_RESUME", "1") not in ("0", "false", "False")
@@ -481,7 +492,7 @@ def ensure_sidecar_next_to_media(sidecar: Path, media_path: Path, lang: str = "e
shutil.copy2(sidecar, dst)
elif sidecar.suffix.lower() == ".vtt":
tmp_srt = sidecar.with_suffix(".srt")
subprocess.run(["ffmpeg", "-nostdin", "-y", "-i", str(sidecar), str(tmp_srt)], check=True)
subprocess.run(["ffmpeg", "-nostdin", "-y", "-threads", str(FFMPEG_THREADS), "-i", str(sidecar), str(tmp_srt)], check=True)
dst = media_path.with_suffix(f".{lang}.srt")
shutil.move(str(tmp_srt), dst)
except Exception as e:
@@ -787,6 +798,7 @@ def extract_audio(src: Path, outdir: Path) -> Path:
# Force audio-only, mono, 16kHz WAV
cmd = [
"ffmpeg", "-nostdin", "-y",
"-threads", str(FFMPEG_THREADS),
"-i", str(src),
"-vn", "-ac", "1", "-ar", "16000",
"-f", "wav", str(wav_path),