reduce overhead of gevent.idle() by only yielding once per 1000 segments

common/common/segments.py

@@ -535,9 +535,10 @@ def fast_cut_range(segments, start, end, fixts=None):
 	first = segments[0] if cut_start else None
 	last = segments[-1] if cut_end else None
 
-	for segment in segments:
+	for i, segment in enumerate(segments):
 		# Since long smart cuts can be CPU and disk bound for quite a while,
 		# yield to give other things a chance to run.
+		if i % 1000 == 0:
 			gevent.idle()
 
 		if segment is None:

restreamer/restreamer/generate_hls.py

@@ -69,8 +69,9 @@ def generate_media(segments, base_url):
 	if segments and segments[0] is None:
 		segments = segments[1:]
 
-	for segment in segments:
+	for i, segment in enumerate(segments):
 		# For very large playlists, give other things a chance to run
+		if i % 1000 == 0:
 			gevent.idle()
 		if segment is None:
 			# Discontinuity. Adding this tag tells the client that we've missed something