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pgsql-server/ oc/src/sgml/runtime.sgml rc/back ...

From: momjian(at)postgresql(dot)org (Bruce Momjian - CVS)
To: pgsql-committers(at)postgresql(dot)org
Subject: pgsql-server/ oc/src/sgml/runtime.sgml rc/back ...
Date: 2003-03-20 04:51:45
Message-ID: 20030320045145.0CC66475C3D@postgresql.org (view raw or flat)
Thread:
Lists: pgsql-committers
CVSROOT:	/cvsroot
Module name:	pgsql-server
Changes by:	momjian(at)postgresql(dot)org	03/03/19 23:51:44

Modified files:
	doc/src/sgml   : runtime.sgml 
	src/backend/postmaster: postmaster.c 
	src/backend/utils/init: miscinit.c 
	src/backend/utils/misc: guc.c postgresql.conf.sample 
	src/include    : miscadmin.h 

Log message:
	> I can see a couple possible downsides: (a) the library might have some
	> weird behavior across fork boundaries; (b) the additional memory space
	> that has to be duplicated into child processes will cost something per
	> child launch, even if the child never uses it.  But these are only
	> arguments that it might not *always* be a prudent thing to do, not that
	> we shouldn't give the DBA the tool to do it if he wants.  So fire away.
	
	Here is a patch for the above, including a documentation update. It
	creates a new GUC variable "preload_libraries", that accepts a list in
	the form:
	
	preload_libraries = '$libdir/mylib1:initfunc,$libdir/mylib2'
	
	If ":initfunc" is omitted or not found, no initialization function is
	executed, but the library is still preloaded. If "$libdir/mylib" isn't
	found, the postmaster refuses to start.
	
	In my testing with PL/R, it reduces the first call to a PL/R function
	(after connecting) from almost 2 seconds, down to about 8 ms.
	
	Joe Conway


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