Remove multiprocessing

Need to check better whether it reaches the end.

src/prefill.py

@@ -7,7 +7,6 @@
 # Distributed under the terms of the MIT license.
 #
 
-from multiprocessing import Pool, TimeoutError
 import pywikibot
 import sys
 import random
@@ -43,18 +42,10 @@ def prefill_cache(max_pages=5000):
     random.shuffle(sortedpages)
 
     print(("INFO: Will start working on {} pages".format(len(sortedpages))))
-    # Takes almost 1 GB of RAM. With 20 processes, more than 1 CPU is needed.
-    with Pool(processes=10) as pool:
-        result = pool.map_async(worker, sortedpages, 100)
-        while True:
-            # FIXME: Doesn't respect max_pages
-            sleep(1)
-            try:
-                print(result.get(12000))
-            except TimeoutError:
-                print("WARNING: One chunk timed out")
-            except StopIteration:
-                print("INFO: We run out of results to print")
+    # FIXME: Doesn't respect max_pages
+    # TODO: Restore multithreading
+    for p in sortedpages:
+        worker(p)
 
 if __name__ == '__main__':
     if len(sys.argv) >= 2: