with <varname>CONFIG_HUGETLBFS=y</varname> and

<varname>CONFIG_HUGETLB_PAGE=y</varname>. You will also have to configure

the operating system to provide enough huge pages of the desired size.

To determine the number of huge pages needed, use the

<command>postgres</command> command to see the value of

<xref linkend="guc-shared-memory-size-in-huge-pages"/>. Note that the

server must be shut down to view this runtime-computed parameter.

This might look like:

The runtime-computed parameter

<xref linkend="guc-shared-memory-size-in-huge-pages"/> reports the number

of huge pages required. This parameter can be viewed before starting the

server with a <command>postgres</command> command like:

<programlisting>

$ <userinput>postgres -D $PGDATA -C shared_memory_size_in_huge_pages</userinput>

3170