linkend="guc-max-files-per-process"/> configuration parameter to

limit the consumption of open files.

</para>

<para>

Another kernel limit that may be of concern when supporting large

numbers of client connections is the maximum socket connection queue

length. If more than that many connection requests arrive within a very

short period, some may get rejected before the postmaster can service

the requests, with those clients receiving unhelpful connection failure

errors such as <quote>Resource temporarily unavailable</quote> or

<quote>Connection refused</quote>. The default queue length limit is 128

on many platforms. To raise it, adjust the appropriate kernel parameter

via <application>sysctl</application>, then restart the postmaster.

The parameter is variously named <varname>net.core.somaxconn</varname>

on Linux, <varname>kern.ipc.soacceptqueue</varname> on newer FreeBSD,

and <varname>kern.ipc.somaxconn</varname> on macOS and other BSD

variants.

</para>

</sect2>

<sect2 id="linux-memory-overcommit">