>.
         If this value is specified without units, it is taken as milliseconds.
         The default value is 200
         milliseconds (<code class="literal">200ms</code>). Note that on many systems, the
         effective resolution of sleep delays is 10 milliseconds; setting
         <code class="varname">bgwriter_delay</code> to a value that is not a multiple of 10
         might have the same results as setting it to the next higher multiple
         of 10.  This parameter can only be set in the
   