Switch the semaphore API on Solaris to unnamed POSIX.

Solaris descendants (Illumos, OpenIndiana, OmniOS, etc.) hit System V
semaphore limits ("No space left on device" from semget) when running
many parallel test scripts under default system settings.  We could
tell people to raise those settings, but there's a better answer.
Unnamed POSIX semaphores have been available on Solaris for decades
and work well, so prefer them, as was recently done for AIX.

This patch also updates the documentation to remove now-unnecessary
advice about raising project.max-sem-ids and project.max-msg-ids.

Author: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Greg Burd <greg@burd.me>
Discussion: https://postgr.es/m/470305.1772417108@sss.pgh.pa.us

diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index b1937cd13abfa97a6854730e431293a8f5c3243d..422a3544f9448b918dafcec929a9af8ee9e5a0b6 100644 (file)
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -1128,13 +1128,8 @@ projadd -c "PostgreSQL DB User" -K "project.max-shm-memory=(privileged,8GB,deny)
        </para>
 
        <para>
-        Other recommended kernel setting changes for database servers which will
-        have a large number of connections are:
-<programlisting>
-project.max-shm-ids=(priv,32768,deny)
-project.max-sem-ids=(priv,4096,deny)
-project.max-msg-ids=(priv,4096,deny)
-</programlisting>
+        To run a very large server, or multiple servers concurrently, you
+        might also need to raise <literal>project.max-shm-ids</literal>.
        </para>
 
        <para>

diff --git a/meson.build b/meson.build
index 70dc64c349aa06742fb52dddb4a6e6382885fddf..f7a87edcc940df918ee6045bc4e491c232f8e2e9 100644 (file)
--- a/meson.build
+++ b/meson.build
@@ -324,6 +324,7 @@ elif host_system == 'openbsd'
 
 elif host_system == 'sunos'
   portname = 'solaris'
+  sema_kind = 'unnamed_posix'
   export_fmt = '-Wl,-M@0@'
   # We need these #defines to get POSIX-conforming versions
   # of many interfaces (sigwait, getpwuid_r, shmdt, ...).

diff --git a/src/template/solaris b/src/template/solaris
index a4d8d38a8f852656b461d023d140d4fbba85f4cd..ea524fdb2bd10e885942349342fb01eb5d0a429b 100644 (file)
--- a/src/template/solaris
+++ b/src/template/solaris
@@ -1,4 +1,9 @@
 # src/template/solaris
 
+# Prefer unnamed POSIX semaphores if available, unless user overrides choice
+if test x"$PREFERRED_SEMAPHORES" = x"" ; then
+  PREFERRED_SEMAPHORES=UNNAMED_POSIX
+fi
+
 # Extra CFLAGS for code that will go into a shared library
 CFLAGS_SL="-fPIC"