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Exercise2c/OUTDATED_process_multiple_images.py

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+import os
+import sys
+from multiprocessing import Pool as ProcessPool
+
+import process_image
+
+def process(n_processes, n_threads, fnames):
+    print(f"Controller with {n_processes} processes and {n_threads} threads / worker")
+
+    # The environment that is set in the parent is inherited by child workers,
+    # but here process_image import numpy, so we need to set the variable
+    # before process_image is imported.
+    os.environ['OMP_NUM_THREADS'] = str(n_threads)
+
+    with ProcessPool(n_processes) as p:
+        signatures = p.map(process_image.magic, fnames)
+    for fname, signature in zip(fnames, signatures):
+        print(f'{fname} → {signature}')
+
+if __name__ == '__main__':
+    n_processes = int(sys.argv[1])
+    n_threads = int(sys.argv[2])
+    fnames = sys.argv[3:]
+
+    process(n_processes, n_threads, fnames)