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Add temp_buffers GUC variable to allow users to determine the size
of the local buffer arena for temporary table access.
This commit is contained in:
Tom Lane
parent
d65522aeb6
commit
91728fa26c
@ -1,5 +1,5 @@
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<!--
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$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.309 2005/03/14 06:49:48 neilc Exp $
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$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.310 2005/03/19 23:27:04 tgl Exp $
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-->
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<chapter Id="runtime">
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@ -1038,6 +1038,33 @@ SET ENABLE_SEQSCAN TO OFF;
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</listitem>
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</varlistentry>
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<varlistentry id="guc-temp-buffers" xreflabel="temp_buffers">
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<term><varname>temp_buffers</varname> (<type>integer</type>)</term>
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<indexterm>
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<primary><varname>temp_buffers</> configuration parameter</primary>
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</indexterm>
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<listitem>
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<para>
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Sets the maximum number of temporary buffers used by each database
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session. These are session-local buffers used only for access
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to temporary tables. The default is 1000. The setting can
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be changed within individual sessions, but only up until the
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first use of temporary tables within a session; subsequent
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attempts to change the value will have no effect on that session.
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</para>
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<para>
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A session will allocate temporary buffers as needed up to the limit
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given by <varname>temp_buffers</>. The cost of setting a large
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value in sessions that do not actually need a lot of temporary
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buffers is only a buffer descriptor, or about 64 bytes, per
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increment in <varname>temp_buffers</>. However if a buffer is
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actually used an additional 8192 bytes will be consumed for it
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(or in general <symbol>BLCKSZ</symbol> bytes).
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</para>
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</listitem>
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</varlistentry>
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<varlistentry id="guc-work-mem" xreflabel="work_mem">
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<term><varname>work_mem</varname> (<type>integer</type>)</term>
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<indexterm>
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@ -9,7 +9,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/storage/buffer/localbuf.c,v 1.65 2005/03/19 17:39:43 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/storage/buffer/localbuf.c,v 1.66 2005/03/19 23:27:05 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -18,6 +18,7 @@
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#include "storage/buf_internals.h"
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#include "storage/bufmgr.h"
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#include "storage/smgr.h"
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#include "utils/guc.h"
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#include "utils/memutils.h"
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#include "utils/resowner.h"
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@ -46,6 +47,9 @@ static int nextFreeLocalBuf = 0;
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static HTAB *LocalBufHash = NULL;
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static void InitLocalBuffers(void);
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/*
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* LocalBufferAlloc -
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* Find or create a local buffer for the given page of the given relation.
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@ -66,6 +70,10 @@ LocalBufferAlloc(Relation reln, BlockNumber blockNum, bool *foundPtr)
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INIT_BUFFERTAG(newTag, reln, blockNum);
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/* Initialize local buffers if first request in this session */
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if (LocalBufHash == NULL)
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InitLocalBuffers();
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/* See if the desired buffer already exists */
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hresult = (LocalBufferLookupEnt *)
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hash_search(LocalBufHash, (void *) &newTag, HASH_FIND, NULL);
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@ -238,32 +246,18 @@ WriteLocalBuffer(Buffer buffer, bool release)
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}
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/*
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* InitLocalBuffer -
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* InitLocalBuffers -
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* init the local buffer cache. Since most queries (esp. multi-user ones)
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* don't involve local buffers, we delay allocating actual memory for the
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* buffers until we need them; just make the buffer headers here.
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*/
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void
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InitLocalBuffer(void)
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static void
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InitLocalBuffers(void)
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{
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int nbufs = 64; /* should be from a GUC var */
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int nbufs = num_temp_buffers;
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HASHCTL info;
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int i;
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/* Create the lookup hash table */
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MemSet(&info, 0, sizeof(info));
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info.keysize = sizeof(BufferTag);
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info.entrysize = sizeof(LocalBufferLookupEnt);
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info.hash = tag_hash;
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LocalBufHash = hash_create("Local Buffer Lookup Table",
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nbufs,
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&info,
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HASH_ELEM | HASH_FUNCTION);
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if (!LocalBufHash)
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elog(ERROR, "could not initialize local buffer hash table");
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/* Allocate and zero buffer headers and auxiliary arrays */
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LocalBufferDescriptors = (BufferDesc *)
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MemoryContextAllocZero(TopMemoryContext,
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@ -291,6 +285,20 @@ InitLocalBuffer(void)
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buf->buf_id = -i - 2;
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}
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/* Create the lookup hash table */
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MemSet(&info, 0, sizeof(info));
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info.keysize = sizeof(BufferTag);
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info.entrysize = sizeof(LocalBufferLookupEnt);
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info.hash = tag_hash;
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LocalBufHash = hash_create("Local Buffer Lookup Table",
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nbufs,
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&info,
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HASH_ELEM | HASH_FUNCTION);
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if (!LocalBufHash)
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elog(ERROR, "could not initialize local buffer hash table");
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/* Initialization done, mark buffers allocated */
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NLocBuffer = nbufs;
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}
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.143 2005/03/18 16:16:09 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/utils/init/postinit.c,v 1.144 2005/03/19 23:27:06 tgl Exp $
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*
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*
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*-------------------------------------------------------------------------
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@ -257,7 +257,6 @@ BaseInit(void)
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/* Do local initialization of storage and buffer managers */
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smgrinit();
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InitBufferPoolAccess();
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InitLocalBuffer();
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}
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@ -10,7 +10,7 @@
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* Written by Peter Eisentraut <peter_e@gmx.net>.
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.255 2005/03/13 09:36:31 neilc Exp $
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* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.256 2005/03/19 23:27:07 tgl Exp $
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*
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*--------------------------------------------------------------------
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*/
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@ -104,6 +104,7 @@ static const char *assign_log_error_verbosity(const char *newval, bool doit,
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GucSource source);
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static const char *assign_log_statement(const char *newval, bool doit,
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GucSource source);
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static const char *show_num_temp_buffers(void);
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static bool assign_phony_autocommit(bool newval, bool doit, GucSource source);
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static const char *assign_custom_variable_classes(const char *newval, bool doit,
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GucSource source);
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@ -144,9 +145,10 @@ bool default_with_oids = false;
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int log_min_error_statement = PANIC;
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int log_min_messages = NOTICE;
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int client_min_messages = NOTICE;
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int log_min_duration_statement = -1;
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int num_temp_buffers = 1000;
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char *ConfigFileName;
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char *HbaFileName;
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char *IdentFileName;
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@ -966,6 +968,15 @@ static struct config_int ConfigureNamesInt[] =
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1000, 16, INT_MAX / BLCKSZ, NULL, NULL
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},
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{
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{"temp_buffers", PGC_USERSET, RESOURCES_MEM,
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gettext_noop("Sets the maximum number of temporary buffers used by each session."),
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NULL
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},
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&num_temp_buffers,
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1000, 100, INT_MAX / BLCKSZ, NULL, show_num_temp_buffers
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},
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{
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{"port", PGC_POSTMASTER, CONN_AUTH_SETTINGS,
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gettext_noop("Sets the TCP port the server listens on."),
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@ -5496,6 +5507,19 @@ assign_log_statement(const char *newval, bool doit, GucSource source)
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return newval; /* OK */
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}
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static const char *
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show_num_temp_buffers(void)
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{
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/*
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* We show the GUC var until local buffers have been initialized,
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* and NLocBuffer afterwards.
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*/
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static char nbuf[32];
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sprintf(nbuf, "%d", NLocBuffer ? NLocBuffer : num_temp_buffers);
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return nbuf;
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}
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static bool
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assign_phony_autocommit(bool newval, bool doit, GucSource source)
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{
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@ -74,6 +74,7 @@
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# - Memory -
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#shared_buffers = 1000 # min 16, at least max_connections*2, 8KB each
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#temp_buffers = 1000 # min 100, 8KB each
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#work_mem = 1024 # min 64, size in KB
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#maintenance_work_mem = 16384 # min 1024, size in KB
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#max_stack_depth = 2048 # min 100, size in KB
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@ -3,7 +3,7 @@
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*
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* Copyright (c) 2000-2005, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/bin/psql/tab-complete.c,v 1.121 2005/01/23 15:58:50 momjian Exp $
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* $PostgreSQL: pgsql/src/bin/psql/tab-complete.c,v 1.122 2005/03/19 23:27:08 tgl Exp $
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*/
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/*----------------------------------------------------------------------
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@ -594,6 +594,7 @@ psql_completion(char *text, int start, int end)
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"superuser_reserved_connections",
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"syslog_facility",
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"syslog_ident",
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"temp_buffers",
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"TimeZone",
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"trace_notify",
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"transform_null_equals",
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.91 2005/03/18 16:16:09 tgl Exp $
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* $PostgreSQL: pgsql/src/include/storage/bufmgr.h,v 1.92 2005/03/19 23:27:10 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -157,7 +157,6 @@ extern void BufmgrCommit(void);
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extern void BufferSync(void);
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extern void BgBufferSync(void);
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extern void InitLocalBuffer(void);
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extern void AtProcExit_LocalBuffers(void);
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/* in freelist.c */
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@ -7,7 +7,7 @@
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* Copyright (c) 2000-2005, PostgreSQL Global Development Group
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* Written by Peter Eisentraut <peter_e@gmx.net>.
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*
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* $PostgreSQL: pgsql/src/include/utils/guc.h,v 1.58 2005/01/01 05:43:09 momjian Exp $
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* $PostgreSQL: pgsql/src/include/utils/guc.h,v 1.59 2005/03/19 23:27:11 tgl Exp $
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*--------------------------------------------------------------------
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*/
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#ifndef GUC_H
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@ -126,6 +126,8 @@ extern int log_min_messages;
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extern int client_min_messages;
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extern int log_min_duration_statement;
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extern int num_temp_buffers;
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extern char *ConfigFileName;
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extern char *HbaFileName;
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extern char *IdentFileName;
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