ing of <code class="literal">0</code> will allow the operation
        to use any number of <code class="varname">shared_buffers</code>.  Otherwise
        valid sizes range from <code class="literal">128 kB</code> to
        <code class="literal">16 GB</code>.  If the specified size would exceed 1/8 the
        size of <code class="varname">shared_buffers</code>, the size is silently capped
        to that value.  The default value is <code class="literal">256 kB</code>.  If
        this value is specified