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> I can see a couple possible downsides: (a) the library might have some

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> 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
This commit is contained in:
Bruce Momjian
2003-03-20 04:51:44 +00:00
parent e733510d5d
commit 15ce2d2e4a
6 changed files with 141 additions and 5 deletions
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3
src/include/miscadmin.h
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@ -12,7 +12,7 @@
* Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: miscadmin.h,v 1.116 2003/02/22 05:57:45 tgl Exp $
* $Id: miscadmin.h,v 1.117 2003/03/20 04:51:44 momjian Exp $
*
* NOTES
* some of the information in this file should be moved to
@ -288,6 +288,7 @@ extern void RecordSharedMemoryInLockFile(unsigned long id1,
unsigned long id2);
extern void ValidatePgVersion(const char *path);
extern void process_preload_libraries(char *preload_libraries_string);
/* these externs do not belong here... */
extern void IgnoreSystemIndexes(bool mode);