+=item B<-m> I<alloc_size>
+
+Allocate value pointers in chunks of I<alloc_size>. This may improve CPU
+utilization on machines with slow C<realloc()> implementations, in
+exchange for slightly higher memory utilization. The default isE<nbsp>1.
+Do not set this more than the B<-w> value divided by your average RRD step
+size.
+