| """Small runtime helpers for the isolated M2RL execution directory.""" |
| from __future__ import annotations |
|
|
| import hashlib |
| import json |
| import os |
| import re |
| import tempfile |
| from pathlib import Path |
|
|
|
|
| def require_allocation(): |
| job = os.environ.get('SLURM_JOB_ID', '') |
| cgroup = Path('/proc/self/cgroup').read_text() |
| if not job.isdigit() or not re.search(r'(?:/|^)job_' + job + r'(?:/|$)', cgroup): |
| raise RuntimeError('M2RL sustained work requires a real Slurm cgroup') |
| if not os.environ.get('SLURM_CPUS_PER_TASK') or not os.environ.get('SLURM_MEM_PER_NODE'): |
| raise RuntimeError('Explicit CPU and memory allocation required') |
| return {'job_id': job, 'cgroup': cgroup.strip(), |
| 'cpus': os.environ['SLURM_CPUS_PER_TASK'], |
| 'memory_mb': os.environ['SLURM_MEM_PER_NODE']} |
|
|
|
|
| def sha256(path): |
| digest = hashlib.sha256() |
| with open(path, 'rb') as stream: |
| for chunk in iter(lambda: stream.read(1024 * 1024), b''): |
| digest.update(chunk) |
| return digest.hexdigest() |
|
|
|
|
| def atomic_json(path, value): |
| path = Path(path) |
| path.parent.mkdir(parents=True, exist_ok=True) |
| fd, temporary = tempfile.mkstemp(prefix=path.name + '.', dir=path.parent) |
| try: |
| with os.fdopen(fd, 'w') as stream: |
| json.dump(value, stream, indent=2, ensure_ascii=False, allow_nan=False) |
| stream.write('\n') |
| stream.flush() |
| os.fsync(stream.fileno()) |
| os.replace(temporary, path) |
| directory = os.open(path.parent, os.O_DIRECTORY) |
| try: |
| os.fsync(directory) |
| finally: |
| os.close(directory) |
| finally: |
| if os.path.exists(temporary): |
| os.unlink(temporary) |
|
|
