postgresql/config
Heikki Linnakangas 025c02420d Speed up CRC calculation using slicing-by-8 algorithm.
This speeds up WAL generation and replay. The new algorithm is
significantly faster with large inputs, like full-page images or when
inserting wide rows. It is slower with tiny inputs, i.e. less than 10 bytes
or so, but the speedup with longer inputs more than make up for that. Even
small WAL records at least have 24 byte header in the front.

The output is identical to the current byte-at-a-time computation, so this
does not affect compatibility. The new algorithm is only used for the
CRC-32C variant, not the legacy version used in tsquery or the
"traditional" CRC-32 used in hstore and ltree. Those are not as performance
critical, and are usually only applied over small inputs, so it seems
better to not carry around the extra lookup tables to speed up those rare
cases.

Abhijit Menon-Sen
2015-02-10 10:54:40 +02:00
..
ac_func_accept_argtypes.m4 Enable compiling with the mingw-w64 32 bit compiler. 2011-12-10 15:35:41 -05:00
acx_pthread.m4 Remove some useless code in the configure script. 2014-07-01 17:51:53 -04:00
c-compiler.m4 Speed up CRC calculation using slicing-by-8 algorithm. 2015-02-10 10:54:40 +02:00
c-library.m4 Remove configure test for nonstandard variants of getpwuid_r(). 2015-01-11 12:52:37 -05:00
config.guess Update config.guess and config.sub 2014-05-10 10:33:34 -04:00
config.sub Update config.guess and config.sub 2014-05-10 10:33:34 -04:00
docbook.m4 Fix configure's search for collateindex.pl. 2012-03-22 00:46:03 -04:00
general.m4 Remove useless whitespace at end of lines 2010-11-23 22:34:55 +02:00
install-sh Fix install-strip on Mac OS X 2012-08-21 23:42:43 -04:00
libtool.m4 Rename AC_PROG_LD* macros to PGAC_PROG_LD*. This avoids clashes with the 2004-07-17 18:53:56 +00:00
Makefile Remove cvs keywords from all files. 2010-09-20 22:08:53 +02:00
missing Remove cvs keywords from all files. 2010-09-20 22:08:53 +02:00
perl.m4 Detect Windows perl linkage parameters in configure script. 2013-01-09 17:49:23 -05:00
prep_buildtree find -path is not portable, so use grep -v instead. 2010-10-25 10:04:00 -03:00
programs.m4 Move PGAC_LDAP_SAFE to config/programs.m4. 2014-07-25 18:51:35 -04:00
python.m4 On OS X, link libpython normally, ignoring the "framework" framework. 2014-05-30 18:19:06 -04:00
tcl.m4 Accept tcl 8.6 in configure's probe for tclsh. 2014-05-10 10:48:01 -04:00
test_quiet_include.h pgindent run for 9.4 2014-05-06 12:12:18 -04:00