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Adjust pgstat message definitions so that the target message size is
specified in just one place and adhered to exactly, rather than just more or less. A side effect is to increase PGSTAT_ACTIVITY_SIZE (maximum reported query length) from 256 to nearly 1000.
This commit is contained in:
Tom Lane
parent
b2ca707746
commit
0ceeb4cbbe
@ -13,7 +13,7 @@
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*
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* Copyright (c) 2001-2003, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.75 2004/06/14 18:08:18 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.76 2004/06/26 16:32:02 tgl Exp $
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* ----------
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*/
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#include "postgres.h"
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@ -22,12 +22,10 @@
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#include <fcntl.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#include <signal.h>
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#include <time.h>
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@ -55,6 +53,47 @@
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#include "utils/syscache.h"
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/* ----------
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* Paths for the statistics files. The %s is replaced with the
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* installation's $PGDATA.
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* ----------
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*/
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#define PGSTAT_STAT_FILENAME "%s/global/pgstat.stat"
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#define PGSTAT_STAT_TMPFILE "%s/global/pgstat.tmp.%d"
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/* ----------
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* Timer definitions.
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* ----------
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*/
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#define PGSTAT_STAT_INTERVAL 500 /* How often to write the status
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* file; in milliseconds. */
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#define PGSTAT_DESTROY_DELAY 10000 /* How long to keep destroyed
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* objects known, to give delayed
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* UDP packets time to arrive;
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* in milliseconds. */
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#define PGSTAT_DESTROY_COUNT (PGSTAT_DESTROY_DELAY / PGSTAT_STAT_INTERVAL)
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#define PGSTAT_RESTART_INTERVAL 60 /* How often to attempt to restart
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* a failed statistics collector;
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* in seconds. */
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/* ----------
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* Amount of space reserved in pgstat_recvbuffer().
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* ----------
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*/
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#define PGSTAT_RECVBUFFERSZ ((int) (1024 * sizeof(PgStat_Msg)))
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/* ----------
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* The initial size hints for the hash tables used in the collector.
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* ----------
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*/
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#define PGSTAT_DB_HASH_SIZE 16
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#define PGSTAT_BE_HASH_SIZE 512
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#define PGSTAT_TAB_HASH_SIZE 512
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/* ----------
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* GUC parameters
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* ----------
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@ -2760,7 +2799,7 @@ pgstat_recv_activity(PgStat_MsgActivity *msg, int len)
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/*
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* Here we check explicitly for 0 return, since we don't want to
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* mangle the activity of an active backend by a delayed packed from a
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* mangle the activity of an active backend by a delayed packet from a
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* dead one.
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*/
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if (pgstat_add_backend(&msg->m_hdr) != 0)
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@ -2768,7 +2807,7 @@ pgstat_recv_activity(PgStat_MsgActivity *msg, int len)
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entry = &(pgStatBeTable[msg->m_hdr.m_backendid - 1]);
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strncpy(entry->activity, msg->m_what, PGSTAT_ACTIVITY_SIZE);
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StrNCpy(entry->activity, msg->m_what, PGSTAT_ACTIVITY_SIZE);
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entry->activity_start_sec =
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GetCurrentAbsoluteTimeUsec(&entry->activity_start_usec);
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@ -5,7 +5,7 @@
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*
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* Copyright (c) 2001-2003, PostgreSQL Global Development Group
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*
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* $PostgreSQL: pgsql/src/include/pgstat.h,v 1.24 2004/06/14 18:08:19 tgl Exp $
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* $PostgreSQL: pgsql/src/include/pgstat.h,v 1.25 2004/06/26 16:32:04 tgl Exp $
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* ----------
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*/
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#ifndef PGSTAT_H
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@ -16,38 +16,6 @@
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#include "utils/rel.h"
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/* ----------
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* Paths for the statistics files. The %s is replaced with the
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* installations $PGDATA.
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* ----------
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*/
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#define PGSTAT_STAT_FILENAME "%s/global/pgstat.stat"
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#define PGSTAT_STAT_TMPFILE "%s/global/pgstat.tmp.%d"
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/* ----------
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* Timer definitions.
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* ----------
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*/
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#define PGSTAT_STAT_INTERVAL 500 /* How often to write the status */
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/* file; in milliseconds. */
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#define PGSTAT_DESTROY_DELAY 10000 /* How long to keep destroyed */
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/* objects known, to give delayed */
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/* UDP packets time to arrive; */
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/* in milliseconds. */
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#define PGSTAT_DESTROY_COUNT (PGSTAT_DESTROY_DELAY / PGSTAT_STAT_INTERVAL)
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#define PGSTAT_RESTART_INTERVAL 60 /* How often to attempt to restart */
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/* a failed statistics collector; in seconds. */
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/* ----------
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* How much of the actual query string to send to the collector.
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* ----------
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*/
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#define PGSTAT_ACTIVITY_SIZE 256
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/* ----------
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* The types of backend/postmaster -> collector messages
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* ----------
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@ -61,22 +29,6 @@
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#define PGSTAT_MTYPE_DROPDB 6
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#define PGSTAT_MTYPE_RESETCOUNTER 7
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/* ----------
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* Amount of space reserved in pgstat_recvbuffer().
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* ----------
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*/
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#define PGSTAT_RECVBUFFERSZ ((int) (1024 * sizeof(PgStat_Msg)))
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/* ----------
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* The initial size hints for the hash tables used in the collector.
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* ----------
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*/
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#define PGSTAT_DB_HASH_SIZE 16
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#define PGSTAT_BE_HASH_SIZE 512
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#define PGSTAT_TAB_HASH_SIZE 512
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/* ----------
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* The data type used for counters.
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* ----------
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@ -84,82 +36,6 @@
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typedef int64 PgStat_Counter;
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/* ------------------------------------------------------------
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* Statistic collector data structures follow
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* ------------------------------------------------------------
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*/
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/* ----------
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* PgStat_StatDBEntry The collectors data per database
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* ----------
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*/
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typedef struct PgStat_StatDBEntry
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{
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Oid databaseid;
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HTAB *tables;
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int n_backends;
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PgStat_Counter n_connects;
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PgStat_Counter n_xact_commit;
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PgStat_Counter n_xact_rollback;
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PgStat_Counter n_blocks_fetched;
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PgStat_Counter n_blocks_hit;
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int destroy;
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} PgStat_StatDBEntry;
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/* ----------
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* PgStat_StatBeEntry The collectors data per backend
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* ----------
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*/
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typedef struct PgStat_StatBeEntry
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{
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Oid databaseid;
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Oid userid;
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int procpid;
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char activity[PGSTAT_ACTIVITY_SIZE];
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AbsoluteTime activity_start_sec;
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int activity_start_usec;
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} PgStat_StatBeEntry;
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/* ----------
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* PgStat_StatBeDead Because UDP packets can arrive out of
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* order, we need to keep some information
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* about backends that are known to be
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* dead for some seconds. This info is held
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* in a hash table of these structs.
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* ----------
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*/
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typedef struct PgStat_StatBeDead
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{
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int procpid;
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int backendid;
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int destroy;
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} PgStat_StatBeDead;
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/* ----------
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* PgStat_StatTabEntry The collectors data table data
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* ----------
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*/
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typedef struct PgStat_StatTabEntry
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{
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Oid tableid;
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PgStat_Counter numscans;
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PgStat_Counter tuples_returned;
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PgStat_Counter tuples_fetched;
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PgStat_Counter tuples_inserted;
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PgStat_Counter tuples_updated;
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PgStat_Counter tuples_deleted;
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PgStat_Counter blocks_fetched;
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PgStat_Counter blocks_hit;
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int destroy;
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} PgStat_StatTabEntry;
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/* ------------------------------------------------------------
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* Message formats follow
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* ------------------------------------------------------------
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@ -181,7 +57,15 @@ typedef struct PgStat_MsgHdr
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} PgStat_MsgHdr;
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/* ----------
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* PgStat_TabEntry A table slot in a MsgTabstat
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* Space available in a message. This will keep the UDP packets below 1K,
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* which should fit unfragmented into the MTU of the lo interface on most
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* platforms. Does anybody care for platforms where it doesn't?
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* ----------
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*/
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#define PGSTAT_MSG_PAYLOAD (1000 - sizeof(PgStat_MsgHdr))
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/* ----------
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* PgStat_TableEntry Per-table info in a MsgTabstat
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* ----------
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*/
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typedef struct PgStat_TableEntry
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@ -234,27 +118,22 @@ typedef struct PgStat_MsgBeterm
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* to parse a query.
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* ----------
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*/
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#define PGSTAT_ACTIVITY_SIZE PGSTAT_MSG_PAYLOAD
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typedef struct PgStat_MsgActivity
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{
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PgStat_MsgHdr m_hdr;
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char m_what[PGSTAT_ACTIVITY_SIZE];
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} PgStat_MsgActivity;
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/* ----------
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* How many table entries fit into a MsgTabstat. Actually,
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* this will keep the UDP packets below 1K, what should fit
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* unfragmented into the MTU of the lo interface on most
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* platforms. Does anybody care for platforms where it doesn't?
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* ----------
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*/
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#define PGSTAT_NUM_TABENTRIES ((1000 - sizeof(PgStat_MsgHdr)) \
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/ sizeof(PgStat_TableEntry))
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/* ----------
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* PgStat_MsgTabstat Sent by the backend to report table
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* and buffer access statistics.
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* ----------
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*/
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#define PGSTAT_NUM_TABENTRIES ((PGSTAT_MSG_PAYLOAD - 3 * sizeof(int)) \
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/ sizeof(PgStat_TableEntry))
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typedef struct PgStat_MsgTabstat
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{
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PgStat_MsgHdr m_hdr;
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@ -264,19 +143,14 @@ typedef struct PgStat_MsgTabstat
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PgStat_TableEntry m_entry[PGSTAT_NUM_TABENTRIES];
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} PgStat_MsgTabstat;
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/* ----------
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* How many Oid entries fit into a MsgTabpurge.
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* ----------
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*/
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#define PGSTAT_NUM_TABPURGE ((1000 - sizeof(PgStat_MsgHdr)) \
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/ sizeof(Oid))
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/* ----------
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* PgStat_MsgTabpurge Sent by the backend to tell the collector
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* about dead tables.
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* ----------
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*/
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#define PGSTAT_NUM_TABPURGE ((PGSTAT_MSG_PAYLOAD - sizeof(int)) \
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/ sizeof(Oid))
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typedef struct PgStat_MsgTabpurge
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{
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PgStat_MsgHdr m_hdr;
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@ -325,6 +199,83 @@ typedef union PgStat_Msg
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} PgStat_Msg;
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/* ------------------------------------------------------------
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* Statistic collector data structures follow
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* ------------------------------------------------------------
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*/
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/* ----------
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* PgStat_StatDBEntry The collectors data per database
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* ----------
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*/
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typedef struct PgStat_StatDBEntry
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{
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Oid databaseid;
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HTAB *tables;
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int n_backends;
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PgStat_Counter n_connects;
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PgStat_Counter n_xact_commit;
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PgStat_Counter n_xact_rollback;
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PgStat_Counter n_blocks_fetched;
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PgStat_Counter n_blocks_hit;
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int destroy;
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} PgStat_StatDBEntry;
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/* ----------
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* PgStat_StatBeEntry The collectors data per backend
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* ----------
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*/
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typedef struct PgStat_StatBeEntry
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{
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Oid databaseid;
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Oid userid;
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int procpid;
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AbsoluteTime activity_start_sec;
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int activity_start_usec;
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char activity[PGSTAT_ACTIVITY_SIZE];
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} PgStat_StatBeEntry;
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/* ----------
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* PgStat_StatBeDead Because UDP packets can arrive out of
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* order, we need to keep some information
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* about backends that are known to be
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* dead for some seconds. This info is held
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* in a hash table of these structs.
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* ----------
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*/
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typedef struct PgStat_StatBeDead
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{
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int procpid;
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int backendid;
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int destroy;
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} PgStat_StatBeDead;
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/* ----------
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* PgStat_StatTabEntry The collectors data table data
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* ----------
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*/
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typedef struct PgStat_StatTabEntry
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{
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Oid tableid;
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PgStat_Counter numscans;
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PgStat_Counter tuples_returned;
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PgStat_Counter tuples_fetched;
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PgStat_Counter tuples_inserted;
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PgStat_Counter tuples_updated;
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PgStat_Counter tuples_deleted;
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PgStat_Counter blocks_fetched;
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PgStat_Counter blocks_hit;
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int destroy;
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} PgStat_StatTabEntry;
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/* ----------
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* GUC parameters
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* ----------
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