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Commitf0828b2

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Provide a build-time option to store large relations as single files, rather
than dividing them into 1GB segments as has been our longtime practice. Thisrequires working support for large files in the operating system; at least forthe time being, it won't be the default.Zdenek Kotala
1 parentb6912af commitf0828b2

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12 files changed

+595
-100
lines changed

12 files changed

+595
-100
lines changed

‎configure‎

Lines changed: 446 additions & 0 deletions
Large diffs are not rendered by default.

‎configure.in‎

Lines changed: 14 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
dnl Process this file with autoconf to produce a configure script.
2-
dnl $PostgreSQL: pgsql/configure.in,v 1.552 2008/02/24 05:21:54 tgl Exp $
2+
dnl $PostgreSQL: pgsql/configure.in,v 1.553 2008/03/10 20:06:27 tgl Exp $
33
dnl
44
dnl Developers, please strive to achieve this order:
55
dnl
@@ -217,6 +217,12 @@ fi
217217
AC_SUBST(DTRACEFLAGS)])
218218
AC_SUBST(enable_dtrace)
219219

220+
#
221+
# Data file segmentation
222+
#
223+
PGAC_ARG_BOOL(enable, segmented-files, yes,
224+
[ --disable-segmented-files disable data file segmentation (requires largefile support)])
225+
220226
#
221227
# C compiler
222228
#
@@ -1411,6 +1417,13 @@ if test $ac_cv_func_fseeko = yes; then
14111417
AC_SYS_LARGEFILE
14121418
fi
14131419

1420+
# Check for largefile support (must be after AC_SYS_LARGEFILE)
1421+
AC_CHECK_SIZEOF([off_t])
1422+
1423+
if test "$ac_cv_sizeof_off_t" -lt 8 -o "$enable_segmented_files" = "yes"; then
1424+
AC_DEFINE([USE_SEGMENTED_FILES], 1, [Define to split data files into 1GB segments.])
1425+
fi
1426+
14141427
# SunOS doesn't handle negative byte comparisons properly with +/- return
14151428
AC_FUNC_MEMCMP
14161429

‎doc/src/sgml/installation.sgml‎

Lines changed: 15 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
<!-- $PostgreSQL: pgsql/doc/src/sgml/installation.sgml,v 1.303 2008/03/06 21:37:33 momjian Exp $ -->
1+
<!-- $PostgreSQL: pgsql/doc/src/sgml/installation.sgml,v 1.304 2008/03/10 20:06:27 tgl Exp $ -->
22

33
<chapter id="installation">
44
<title><![%standalone-include[<productname>PostgreSQL</>]]>
@@ -1025,6 +1025,20 @@ su - postgres
10251025
</listitem>
10261026
</varlistentry>
10271027

1028+
<varlistentry>
1029+
<term><option>--disable-segmented-files</option></term>
1030+
<listitem>
1031+
<para>
1032+
Store large tables as single operating-system files, rather than
1033+
dividing them into 1GB segments as is the default. This option
1034+
is ignored unless the operating system has <quote>largefile</>
1035+
support (which most do, nowadays). It can be helpful to reduce
1036+
the number of file descriptors consumed when working with very
1037+
large tables.
1038+
</para>
1039+
</listitem>
1040+
</varlistentry>
1041+
10281042
<varlistentry>
10291043
<term><option>--disable-spinlocks</option></term>
10301044
<listitem>

‎doc/src/sgml/storage.sgml‎

Lines changed: 6 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,4 +1,4 @@
1-
<!-- $PostgreSQL: pgsql/doc/src/sgml/storage.sgml,v 1.21 2007/11/23 00:24:12 ishii Exp $ -->
1+
<!-- $PostgreSQL: pgsql/doc/src/sgml/storage.sgml,v 1.22 2008/03/10 20:06:27 tgl Exp $ -->
22

33
<chapter id="storage">
44

@@ -138,10 +138,14 @@ Avoid assuming that filenode and table OID are the same.
138138
</caution>
139139

140140
<para>
141-
When a table or index exceeds 1 GB, it is divided into gigabyte-sized
141+
When a table or index exceeds 1 GB, it isnormallydivided into gigabyte-sized
142142
<firstterm>segments</>. The first segment's file name is the same as the
143143
filenode; subsequent segments are named filenode.1, filenode.2, etc.
144144
This arrangement avoids problems on platforms that have file size limitations.
145+
(But if the platform does not have such a limitation, and
146+
<option>--disable-segmented-files</option> was specified when
147+
<productname>PostgreSQL</> was built, then each table or index is stored
148+
as a single file, without segmentation.)
145149
The contents of tables and indexes are discussed further in
146150
<xref linkend="storage-page-layout">.
147151
</para>

‎src/backend/storage/file/buffile.c‎

Lines changed: 20 additions & 21 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1994, Regents of the University of California
88
*
99
* IDENTIFICATION
10-
* $PostgreSQL: pgsql/src/backend/storage/file/buffile.c,v 1.29 2008/01/01 19:45:51 momjian Exp $
10+
* $PostgreSQL: pgsql/src/backend/storage/file/buffile.c,v 1.30 2008/03/10 20:06:27 tgl Exp $
1111
*
1212
* NOTES:
1313
*
@@ -38,13 +38,12 @@
3838
#include"storage/buffile.h"
3939

4040
/*
41-
* The maximum safe file size is presumed to be RELSEG_SIZE * BLCKSZ.
42-
* Note we adhere to this limit whether or not LET_OS_MANAGE_FILESIZE
43-
* is defined, although md.c ignores it when that symbol is defined.
44-
* The reason for doing this is that we'd like large temporary BufFiles
45-
* to be spread across multiple tablespaces when available.
41+
* We break BufFiles into gigabyte-sized segments, whether or not
42+
* USE_SEGMENTED_FILES is defined. The reason is that we'd like large
43+
* temporary BufFiles to be spread across multiple tablespaces when available.
4644
*/
47-
#defineMAX_PHYSICAL_FILESIZE (RELSEG_SIZE * BLCKSZ)
45+
#defineMAX_PHYSICAL_FILESIZE0x40000000
46+
#defineBUFFILE_SEG_SIZE(MAX_PHYSICAL_FILESIZE / BLCKSZ)
4847

4948
/*
5049
* This data structure represents a buffered file that consists of one or
@@ -56,7 +55,7 @@ struct BufFile
5655
intnumFiles;/* number of physical files in set */
5756
/* all files except the last have length exactly MAX_PHYSICAL_FILESIZE */
5857
File*files;/* palloc'd array with numFiles entries */
59-
long*offsets;/* palloc'd array with numFiles entries */
58+
off_t*offsets;/* palloc'd array with numFiles entries */
6059

6160
/*
6261
* offsets[i] is the current seek position of files[i]. We use this to
@@ -72,7 +71,7 @@ struct BufFile
7271
* Position as seen by user of BufFile is (curFile, curOffset + pos).
7372
*/
7473
intcurFile;/* file index (0..n) part of current pos */
75-
intcurOffset;/* offset part of current pos */
74+
off_tcurOffset;/* offset part of current pos */
7675
intpos;/* next read/write position in buffer */
7776
intnbytes;/* total # of valid bytes in buffer */
7877
charbuffer[BLCKSZ];
@@ -97,7 +96,7 @@ makeBufFile(File firstfile)
9796
file->numFiles=1;
9897
file->files= (File*)palloc(sizeof(File));
9998
file->files[0]=firstfile;
100-
file->offsets= (long*)palloc(sizeof(long));
99+
file->offsets= (off_t*)palloc(sizeof(off_t));
101100
file->offsets[0]=0L;
102101
file->isTemp= false;
103102
file->isInterXact= false;
@@ -124,8 +123,8 @@ extendBufFile(BufFile *file)
124123

125124
file->files= (File*)repalloc(file->files,
126125
(file->numFiles+1)*sizeof(File));
127-
file->offsets= (long*)repalloc(file->offsets,
128-
(file->numFiles+1)*sizeof(long));
126+
file->offsets= (off_t*)repalloc(file->offsets,
127+
(file->numFiles+1)*sizeof(off_t));
129128
file->files[file->numFiles]=pfile;
130129
file->offsets[file->numFiles]=0L;
131130
file->numFiles++;
@@ -279,9 +278,9 @@ BufFileDumpBuffer(BufFile *file)
279278
bytestowrite=file->nbytes-wpos;
280279
if (file->isTemp)
281280
{
282-
longavailbytes=MAX_PHYSICAL_FILESIZE-file->curOffset;
281+
off_tavailbytes=MAX_PHYSICAL_FILESIZE-file->curOffset;
283282

284-
if ((long)bytestowrite>availbytes)
283+
if ((off_t)bytestowrite>availbytes)
285284
bytestowrite= (int)availbytes;
286285
}
287286

@@ -451,10 +450,10 @@ BufFileFlush(BufFile *file)
451450
* impossible seek is attempted.
452451
*/
453452
int
454-
BufFileSeek(BufFile*file,intfileno,longoffset,intwhence)
453+
BufFileSeek(BufFile*file,intfileno,off_toffset,intwhence)
455454
{
456455
intnewFile;
457-
longnewOffset;
456+
off_tnewOffset;
458457

459458
switch (whence)
460459
{
@@ -469,7 +468,7 @@ BufFileSeek(BufFile *file, int fileno, long offset, int whence)
469468
/*
470469
* Relative seek considers only the signed offset, ignoring
471470
* fileno. Note that large offsets (> 1 gig) risk overflow in this
472-
* add...
471+
* add, unless we have 64-bit off_t.
473472
*/
474473
newFile=file->curFile;
475474
newOffset= (file->curOffset+file->pos)+offset;
@@ -537,7 +536,7 @@ BufFileSeek(BufFile *file, int fileno, long offset, int whence)
537536
}
538537

539538
void
540-
BufFileTell(BufFile*file,int*fileno,long*offset)
539+
BufFileTell(BufFile*file,int*fileno,off_t*offset)
541540
{
542541
*fileno=file->curFile;
543542
*offset=file->curOffset+file->pos;
@@ -558,8 +557,8 @@ int
558557
BufFileSeekBlock(BufFile*file,longblknum)
559558
{
560559
returnBufFileSeek(file,
561-
(int) (blknum /RELSEG_SIZE),
562-
(blknum %RELSEG_SIZE)*BLCKSZ,
560+
(int) (blknum /BUFFILE_SEG_SIZE),
561+
(off_t) (blknum %BUFFILE_SEG_SIZE)*BLCKSZ,
563562
SEEK_SET);
564563
}
565564

@@ -575,7 +574,7 @@ BufFileTellBlock(BufFile *file)
575574
longblknum;
576575

577576
blknum= (file->curOffset+file->pos) /BLCKSZ;
578-
blknum+=file->curFile*RELSEG_SIZE;
577+
blknum+=file->curFile*BUFFILE_SEG_SIZE;
579578
returnblknum;
580579
}
581580

‎src/backend/storage/file/fd.c‎

Lines changed: 29 additions & 24 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
* Portions Copyright (c) 1994, Regents of the University of California
88
*
99
* IDENTIFICATION
10-
* $PostgreSQL: pgsql/src/backend/storage/file/fd.c,v 1.143 2008/01/01 19:45:51 momjian Exp $
10+
* $PostgreSQL: pgsql/src/backend/storage/file/fd.c,v 1.144 2008/03/10 20:06:27 tgl Exp $
1111
*
1212
* NOTES:
1313
*
@@ -115,21 +115,21 @@ static intmax_safe_fds = 32;/* default if not changed */
115115

116116
#defineFileIsNotOpen(file) (VfdCache[file].fd == VFD_CLOSED)
117117

118-
#defineFileUnknownPos (-1L)
118+
#defineFileUnknownPos ((off_t) -1)
119119

120120
/* these are the assigned bits in fdstate below: */
121121
#defineFD_TEMPORARY(1 << 0)/* T = delete when closed */
122122
#defineFD_XACT_TEMPORARY(1 << 1)/* T = delete at eoXact */
123123

124124
typedefstructvfd
125125
{
126-
signed shortfd;/* current FD, or VFD_CLOSED if none */
126+
intfd;/* current FD, or VFD_CLOSED if none */
127127
unsigned shortfdstate;/* bitflags for VFD's state */
128-
SubTransactionIdcreate_subid;/* for TEMPORARY fds, creating subxact */
128+
SubTransactionIdcreate_subid;/* for TEMPORARY fds, creating subxact */
129129
FilenextFree;/* link to next free VFD, if in freelist */
130130
FilelruMoreRecently;/* doubly linked recency-of-use list */
131131
FilelruLessRecently;
132-
longseekPos;/* current logical file position */
132+
off_tseekPos;/* current logical file position */
133133
char*fileName;/* name of file, or NULL for unused VFD */
134134
/* NB: fileName is malloc'd, and must be free'd when closing the VFD */
135135
intfileFlags;/* open(2) flags for (re)opening the file */
@@ -544,8 +544,8 @@ LruDelete(File file)
544544
Delete(file);
545545

546546
/* save the seek position */
547-
vfdP->seekPos=(long)lseek(vfdP->fd,0L,SEEK_CUR);
548-
Assert(vfdP->seekPos!=-1L);
547+
vfdP->seekPos=lseek(vfdP->fd,(off_t)0,SEEK_CUR);
548+
Assert(vfdP->seekPos!=(off_t)-1);
549549

550550
/* close the file */
551551
if (close(vfdP->fd))
@@ -616,12 +616,12 @@ LruInsert(File file)
616616
}
617617

618618
/* seek to the right position */
619-
if (vfdP->seekPos!=0L)
619+
if (vfdP->seekPos!=(off_t)0)
620620
{
621-
longreturnValue;
621+
off_treturnValue;
622622

623-
returnValue=(long)lseek(vfdP->fd,vfdP->seekPos,SEEK_SET);
624-
Assert(returnValue!=-1L);
623+
returnValue=lseek(vfdP->fd,vfdP->seekPos,SEEK_SET);
624+
Assert(returnValue!=(off_t)-1);
625625
}
626626
}
627627

@@ -1027,9 +1027,10 @@ FileRead(File file, char *buffer, int amount)
10271027

10281028
Assert(FileIsValid(file));
10291029

1030-
DO_DB(elog(LOG,"FileRead: %d (%s)%ld %d %p",
1030+
DO_DB(elog(LOG,"FileRead: %d (%s)"INT64_FORMAT" %d %p",
10311031
file,VfdCache[file].fileName,
1032-
VfdCache[file].seekPos,amount,buffer));
1032+
(int64)VfdCache[file].seekPos,
1033+
amount,buffer));
10331034

10341035
returnCode=FileAccess(file);
10351036
if (returnCode<0)
@@ -1081,9 +1082,10 @@ FileWrite(File file, char *buffer, int amount)
10811082

10821083
Assert(FileIsValid(file));
10831084

1084-
DO_DB(elog(LOG,"FileWrite: %d (%s)%ld %d %p",
1085+
DO_DB(elog(LOG,"FileWrite: %d (%s)"INT64_FORMAT" %d %p",
10851086
file,VfdCache[file].fileName,
1086-
VfdCache[file].seekPos,amount,buffer));
1087+
(int64)VfdCache[file].seekPos,
1088+
amount,buffer));
10871089

10881090
returnCode=FileAccess(file);
10891091
if (returnCode<0)
@@ -1146,24 +1148,26 @@ FileSync(File file)
11461148
returnpg_fsync(VfdCache[file].fd);
11471149
}
11481150

1149-
long
1150-
FileSeek(Filefile,longoffset,intwhence)
1151+
off_t
1152+
FileSeek(Filefile,off_toffset,intwhence)
11511153
{
11521154
intreturnCode;
11531155

11541156
Assert(FileIsValid(file));
11551157

1156-
DO_DB(elog(LOG,"FileSeek: %d (%s)%ld %ld %d",
1158+
DO_DB(elog(LOG,"FileSeek: %d (%s)"INT64_FORMAT" "INT64_FORMAT" %d",
11571159
file,VfdCache[file].fileName,
1158-
VfdCache[file].seekPos,offset,whence));
1160+
(int64)VfdCache[file].seekPos,
1161+
(int64)offset,whence));
11591162

11601163
if (FileIsNotOpen(file))
11611164
{
11621165
switch (whence)
11631166
{
11641167
caseSEEK_SET:
11651168
if (offset<0)
1166-
elog(ERROR,"invalid seek offset: %ld",offset);
1169+
elog(ERROR,"invalid seek offset: "INT64_FORMAT,
1170+
(int64)offset);
11671171
VfdCache[file].seekPos=offset;
11681172
break;
11691173
caseSEEK_CUR:
@@ -1187,7 +1191,8 @@ FileSeek(File file, long offset, int whence)
11871191
{
11881192
caseSEEK_SET:
11891193
if (offset<0)
1190-
elog(ERROR,"invalid seek offset: %ld",offset);
1194+
elog(ERROR,"invalid seek offset: "INT64_FORMAT,
1195+
(int64)offset);
11911196
if (VfdCache[file].seekPos!=offset)
11921197
VfdCache[file].seekPos=lseek(VfdCache[file].fd,
11931198
offset,whence);
@@ -1213,7 +1218,7 @@ FileSeek(File file, long offset, int whence)
12131218
* XXX not actually used but here for completeness
12141219
*/
12151220
#ifdefNOT_USED
1216-
long
1221+
off_t
12171222
FileTell(Filefile)
12181223
{
12191224
Assert(FileIsValid(file));
@@ -1224,7 +1229,7 @@ FileTell(File file)
12241229
#endif
12251230

12261231
int
1227-
FileTruncate(Filefile,longoffset)
1232+
FileTruncate(Filefile,off_toffset)
12281233
{
12291234
intreturnCode;
12301235

@@ -1237,7 +1242,7 @@ FileTruncate(File file, long offset)
12371242
if (returnCode<0)
12381243
returnreturnCode;
12391244

1240-
returnCode=ftruncate(VfdCache[file].fd,(size_t)offset);
1245+
returnCode=ftruncate(VfdCache[file].fd,offset);
12411246
returnreturnCode;
12421247
}
12431248

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