database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-08-31 17:02:12 +03:00
Code Activity

Convert the arithmetic for shared memory size calculation from 'int'

Browse Source 
to 'Size' (that is, size_t), and install overflow detection checks in it.
This allows us to remove the former arbitrary restrictions on NBuffers
etc.  It won't make any difference in a 32-bit machine, but in a 64-bit
machine you could theoretically have terabytes of shared buffers.
(How efficiently we could manage 'em remains to be seen.)  Similarly,
num_temp_buffers, work_mem, and maintenance_work_mem can be set above
2Gb on a 64-bit machine.  Original patch from Koichi Suzuki, additional
work by moi.
This commit is contained in:
Tom Lane
2005-08-20 23:26:37 +00:00
parent 2299ceab1c
commit 0007490e09
50 changed files with 774 additions and 275 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
src/backend/commands/vacuumlazy.c
View File

@@ -31,7 +31,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.56 2005/07/29 19:30:03 tgl Exp $
* $PostgreSQL: pgsql/src/backend/commands/vacuumlazy.c,v 1.57 2005/08/20 23:26:13 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -954,16 +954,16 @@ count_nondeletable_pages(Relation onerel, LVRelStats *vacrelstats)
static void
lazy_space_alloc(LVRelStats *vacrelstats, BlockNumber relblocks)
{
int maxtuples;
long maxtuples;
int maxpages;
maxtuples = (int) ((maintenance_work_mem * 1024L) / sizeof(ItemPointerData));
maxtuples = (maintenance_work_mem * 1024L) / sizeof(ItemPointerData);
maxtuples = Min(maxtuples, INT_MAX);
/* stay sane if small maintenance_work_mem */
if (maxtuples < MAX_TUPLES_PER_PAGE)
maxtuples = MAX_TUPLES_PER_PAGE;
maxtuples = Max(maxtuples, MAX_TUPLES_PER_PAGE);
vacrelstats->num_dead_tuples = 0;
vacrelstats->max_dead_tuples = maxtuples;
vacrelstats->max_dead_tuples = (int) maxtuples;
vacrelstats->dead_tuples = (ItemPointer)
palloc(maxtuples * sizeof(ItemPointerData));