database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-06-14 18:42:34 +03:00
Code Activity

Change memory-space accounting mechanism in tuplesort.c and tuplestore.c

Browse Source 
to make a reasonable attempt at accounting for palloc overhead, not just
the requested size of each memory chunk.  Since in many scenarios this
will make for a significant reduction in the amount of space acquired,
partially compensate by doubling the default value of SORT_MEM to 1Mb.
Per discussion in pgsql-general around 9-Jun-2002..
This commit is contained in:
Tom Lane
2002-08-12 00:36:12 +00:00
parent e44beef712
commit 77a7e9968b
10 changed files with 140 additions and 134 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
doc/src/sgml/runtime.sgml
View File

@ -1,5 +1,5 @@
<!--
$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.123 2002/08/09 22:52:04 petere Exp $
$Header: /cvsroot/pgsql/doc/src/sgml/runtime.sgml,v 1.124 2002/08/12 00:36:11 tgl Exp $
-->
<Chapter Id="runtime">
@ -1640,8 +1640,8 @@ dynamic_library_path = '/usr/local/lib/postgresql:/home/my_project/lib:$libdir'
<para>
Specifies the amount of memory to be used by internal sorts and
hashes before switching to temporary disk files. The value is
specified in kilobytes, and defaults to 512 kilobytes. Note that
for a complex query, several sorts and/or hashes might be
specified in kilobytes, and defaults to 1024 kilobytes (1MB).
Note that for a complex query, several sorts and/or hashes might be
running in parallel, and each one will be allowed to use as much
memory as this value specifies before it starts to put data into
temporary files. Also, each running backend could be doing one