diff options
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 74 |
1 files changed, 66 insertions, 8 deletions
diff --git a/configure.in b/configure.in index 361cd4badb..ca84960dbf 100644 --- a/configure.in +++ b/configure.in @@ -1,5 +1,5 @@ dnl Process this file with autoconf to produce a configure script. -dnl $PostgreSQL: pgsql/configure.in,v 1.557 2008/04/28 22:47:03 tgl Exp $ +dnl $PostgreSQL: pgsql/configure.in,v 1.558 2008/05/02 01:08:26 tgl Exp $ dnl dnl Developers, please strive to achieve this order: dnl @@ -155,7 +155,7 @@ AC_SUBST(WANTED_LANGUAGES) # Default port number (--with-pgport), default 5432 # AC_MSG_CHECKING([for default port number]) -PGAC_ARG_REQ(with, pgport, [ --with-pgport=PORTNUM change default port number [[5432]]], +PGAC_ARG_REQ(with, pgport, [ --with-pgport=PORTNUM set default port number [[5432]]], [default_port=$withval], [default_port=5432]) AC_MSG_RESULT([$default_port]) @@ -218,10 +218,67 @@ AC_SUBST(DTRACEFLAGS)]) AC_SUBST(enable_dtrace) # -# Data file segmentation -# -PGAC_ARG_BOOL(enable, segmented-files, yes, - [ --disable-segmented-files disable data file segmentation (requires largefile support)]) +# Block size +# +AC_MSG_CHECKING([for block size]) +PGAC_ARG_REQ(with, blocksize, [ --with-blocksize=BLOCKSIZE set block size in kB [[8]]], + [blocksize=$withval], + [blocksize=8]) +case ${blocksize} in + 1) BLCKSZ=1024;; + 2) BLCKSZ=2048;; + 4) BLCKSZ=4096;; + 8) BLCKSZ=8192;; + 16) BLCKSZ=16384;; + 32) BLCKSZ=32768;; + *) AC_MSG_ERROR([Invalid block size. Allowed values are 1,2,4,8,16,32.]) +esac +AC_MSG_RESULT([${blocksize}kB]) + +AC_DEFINE_UNQUOTED([BLCKSZ], ${BLCKSZ}, [ + Size of a disk block --- this also limits the size of a tuple. You + can set it bigger if you need bigger tuples (although TOAST should + reduce the need to have large tuples, since fields can be spread + across multiple tuples). + + BLCKSZ must be a power of 2. The maximum possible value of BLCKSZ + is currently 2^15 (32768). This is determined by the 15-bit widths + of the lp_off and lp_len fields in ItemIdData (see + include/storage/itemid.h). + + Changing BLCKSZ requires an initdb. +]) + +# +# File segment size +# +AC_MSG_CHECKING([for segment size]) +PGAC_ARG_REQ(with, segsize, [ --with-segsize=SEGSIZE set segment size in GB [[1]]], + [segsize=$withval], + [segsize=1]) +# this expression is set up to avoid unnecessary integer overflow +RELSEG_SIZE=`expr '(' 1024 '*' ${segsize} / ${blocksize} ')' '*' 1024` +test $? -eq 0 || exit 1 +AC_MSG_RESULT([${segsize}GB]) + +AC_DEFINE_UNQUOTED([RELSEG_SIZE], ${RELSEG_SIZE}, [ + RELSEG_SIZE is the maximum number of blocks allowed in one disk file. + Thus, the maximum size of a single file is RELSEG_SIZE * BLCKSZ; + relations bigger than that are divided into multiple files. + + RELSEG_SIZE * BLCKSZ must be less than your OS' limit on file size. + This is often 2 GB or 4GB in a 32-bit operating system, unless you + have large file support enabled. By default, we make the limit 1 GB + to avoid any possible integer-overflow problems within the OS. + A limit smaller than necessary only means we divide a large + relation into more chunks than necessary, so it seems best to err + in the direction of a small limit. + + A power-of-2 value is recommended to save a few cycles in md.c, + but is not absolutely required. + + Changing RELSEG_SIZE requires an initdb. +]) # # C compiler @@ -1469,8 +1526,9 @@ fi # Check for largefile support (must be after AC_SYS_LARGEFILE) AC_CHECK_SIZEOF([off_t]) -if test "$ac_cv_sizeof_off_t" -lt 8 -o "$enable_segmented_files" = "yes"; then - AC_DEFINE([USE_SEGMENTED_FILES], 1, [Define to split data files into 1GB segments.]) +# If we don't have largefile support, can't handle segsize >= 2GB. +if test "$ac_cv_sizeof_off_t" -lt 8 -a "$segsize" != "1"; then + AC_MSG_ERROR([Large file support is not enabled. Segment size cannot be larger than 1GB.]) fi # SunOS doesn't handle negative byte comparisons properly with +/- return |