Note that max_worker_processes requires restart.

robertmhaas · robertmhaas · commit 1e77949e67b9 · 2016-05-03T10:39:21.000-04:00
Since this is a minor issue, no back-patch.

Julien Rouhaud
diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample
@@ -166,7 +166,7 @@
 # - Asynchronous Behavior -
 
 #effective_io_concurrency = 1		# 1-1000; 0 disables prefetching
-#max_worker_processes = 8
+#max_worker_processes = 8		# (change requires restart)
 #max_parallel_degree = 2		# max number of worker processes per node
 #old_snapshot_threshold = -1		# 1min-60d; -1 disables; 0 is immediate
 									# (change requires restart)
