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Commitdfdd59e

Browse files
Jan WieckJan Wieck
Jan Wieck
authored and
Jan Wieck
committed
Adjusted calculation of shared memory requirements to new
ARC buffer replacement strategy.Jan
1 parentcfd7fb7 commitdfdd59e

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3 files changed

+56
-47
lines changed

3 files changed

+56
-47
lines changed

‎src/backend/storage/buffer/buf_init.c‎

Lines changed: 9 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/storage/buffer/buf_init.c,v 1.60 2003/12/20 17:31:21 momjian Exp $
11+
* $PostgreSQL: pgsql/src/backend/storage/buffer/buf_init.c,v 1.61 2004/01/15 16:14:26 wieck Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -231,13 +231,19 @@ BufferShmemSize(void)
231231
size+=hash_estimate_size(SHMEM_INDEX_SIZE,sizeof(ShmemIndexEnt));
232232

233233
/* size of buffer descriptors */
234-
size+=MAXALIGN((NBuffers+1)*sizeof(BufferDesc));
234+
size+=MAXALIGN(NBuffers*sizeof(BufferDesc));
235+
236+
/* size of the shared replacement strategy control block */
237+
size+=MAXALIGN(sizeof(BufferStrategyControl));
238+
239+
/* size of the ARC directory blocks */
240+
size+=MAXALIGN(NBuffers*2*sizeof(BufferStrategyCDB));
235241

236242
/* size of data pages */
237243
size+=NBuffers*MAXALIGN(BLCKSZ);
238244

239245
/* size of buffer hash table */
240-
size+=hash_estimate_size(NBuffers,sizeof(BufferLookupEnt));
246+
size+=hash_estimate_size(NBuffers*2,sizeof(BufferLookupEnt));
241247

242248
returnsize;
243249
}

‎src/backend/storage/buffer/freelist.c‎

Lines changed: 1 addition & 42 deletions
Original file line numberDiff line numberDiff line change
@@ -8,7 +8,7 @@
88
*
99
*
1010
* IDENTIFICATION
11-
* $PostgreSQL: pgsql/src/backend/storage/buffer/freelist.c,v 1.38 2003/11/29 19:51:56 pgsql Exp $
11+
* $PostgreSQL: pgsql/src/backend/storage/buffer/freelist.c,v 1.39 2004/01/15 16:14:26 wieck Exp $
1212
*
1313
*-------------------------------------------------------------------------
1414
*/
@@ -32,54 +32,13 @@
3232
#include"storage/proc.h"
3333
#include"access/xact.h"
3434

35-
#defineSTRAT_LIST_UNUSED-1
36-
#defineSTRAT_LIST_B10
37-
#defineSTRAT_LIST_T11
38-
#defineSTRAT_LIST_T22
39-
#defineSTRAT_LIST_B23
40-
#defineSTRAT_NUM_LISTS4
41-
4235
#ifndefMAX
4336
#defineMAX(a,b) (((a) > (b)) ? (a) : (b))
4437
#endif
4538
#ifndefMIN
4639
#defineMIN(a,b) (((a) < (b)) ? (a) : (b))
4740
#endif
4841

49-
/*
50-
* The Cache Directory Block (CDB) of the Adaptive Replacement Cache (ARC)
51-
*/
52-
typedefstructbufstratcdb
53-
{
54-
intprev;/* links in the queue */
55-
intnext;
56-
intlist;/* current list */
57-
BufferTagbuf_tag;/* buffer key */
58-
Bufferbuf_id;/* currently assigned data buffer */
59-
TransactionIdt1_xid;/* the xid this entry went onto T1 */
60-
}BufferStrategyCDB;
61-
62-
/*
63-
* The shared ARC control information.
64-
*/
65-
typedefstructbufstratcontrol
66-
{
67-
68-
inttarget_T1_size;/* What T1 size are we aiming for */
69-
intlistUnusedCDB;/* All unused StrategyCDB */
70-
intlistHead[STRAT_NUM_LISTS];/* ARC lists B1, T1, T2 and B2 */
71-
intlistTail[STRAT_NUM_LISTS];
72-
intlistSize[STRAT_NUM_LISTS];
73-
BufferlistFreeBuffers;/* List of unused buffers */
74-
75-
longnum_lookup;/* Some hit statistics */
76-
longnum_hit[STRAT_NUM_LISTS];
77-
time_tstat_report;
78-
79-
BufferStrategyCDBcdb[1];/* The cache directory */
80-
}BufferStrategyControl;
81-
82-
8342
staticBufferStrategyControl*StrategyControl=NULL;
8443
staticBufferStrategyCDB*StrategyCDB=NULL;
8544

‎src/include/storage/buf_internals.h‎

Lines changed: 46 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -1,13 +1,14 @@
11
/*-------------------------------------------------------------------------
22
*
33
* buf_internals.h
4-
* Internal definitions for buffer manager.
4+
* Internal definitions for buffer manager and the buffer replacement
5+
* strategy.
56
*
67
*
78
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
89
* Portions Copyright (c) 1994, Regents of the University of California
910
*
10-
* $PostgreSQL: pgsql/src/include/storage/buf_internals.h,v 1.66 2003/12/14 00:34:47 neilc Exp $
11+
* $PostgreSQL: pgsql/src/include/storage/buf_internals.h,v 1.67 2004/01/15 16:14:26 wieck Exp $
1112
*
1213
*-------------------------------------------------------------------------
1314
*/
@@ -135,6 +136,49 @@ typedef struct
135136
Bufferid;
136137
}BufferLookupEnt;
137138

139+
/*
140+
* Definitions for the buffer replacement strategy
141+
*/
142+
#defineSTRAT_LIST_UNUSED-1
143+
#defineSTRAT_LIST_B10
144+
#defineSTRAT_LIST_T11
145+
#defineSTRAT_LIST_T22
146+
#defineSTRAT_LIST_B23
147+
#defineSTRAT_NUM_LISTS4
148+
149+
/*
150+
* The Cache Directory Block (CDB) of the Adaptive Replacement Cache (ARC)
151+
*/
152+
typedefstruct
153+
{
154+
intprev;/* links in the queue */
155+
intnext;
156+
intlist;/* current list */
157+
BufferTagbuf_tag;/* buffer key */
158+
Bufferbuf_id;/* currently assigned data buffer */
159+
TransactionIdt1_xid;/* the xid this entry went onto T1 */
160+
}BufferStrategyCDB;
161+
162+
/*
163+
* The shared ARC control information.
164+
*/
165+
typedefstruct
166+
{
167+
168+
inttarget_T1_size;/* What T1 size are we aiming for */
169+
intlistUnusedCDB;/* All unused StrategyCDB */
170+
intlistHead[STRAT_NUM_LISTS];/* ARC lists B1, T1, T2 and B2 */
171+
intlistTail[STRAT_NUM_LISTS];
172+
intlistSize[STRAT_NUM_LISTS];
173+
BufferlistFreeBuffers;/* List of unused buffers */
174+
175+
longnum_lookup;/* Some hit statistics */
176+
longnum_hit[STRAT_NUM_LISTS];
177+
time_tstat_report;
178+
179+
BufferStrategyCDBcdb[1];/* The cache directory */
180+
}BufferStrategyControl;
181+
138182
/* counters in buf_init.c */
139183
externlongintReadBufferCount;
140184
externlongintReadLocalBufferCount;

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