Postgresql Configutation and overflow - Mailing list pgsql-performance
From | Fabricio Peñuelas |
---|---|
Subject | Postgresql Configutation and overflow |
Date | |
Msg-id | BAY115-F32A6C6D98981E68526869EFEC60@phx.gbl Whole thread Raw |
List | pgsql-performance |
Good day, I have been reading about the configuration of postgresql, but I have a server who does not give me the performance that should. The tables are indexed and made vacuum regularly, i monitor with top, ps and pg_stat_activity and when i checked was slow without a heavy load overage. Before, the server reached 2000 connections to postgresql (with max_connections=3000 in it for future workflow). I divided the load with another server for better performance, and now reach 500 connections, but yet is overflow. My question is about how much memory should i configure in shared_buffers and effective_cache_size. Features: - 4 Processsors Intel Xeon Dual 3.0Ghz - 12 GB RAM - 2 discos en RAID 1 for OS - 4 discs RAID 5 for DB - S.O Slackware 11.0 Linux 2.6.17.7 - Postgres 8.1.4 =====In internet i found this: Tuning PostgreSQL for performance 2 Some basic parameters 2.1 Shared buffers # Start at 4MB (512) for a workstation # Medium size data set and 256-512MB available RAM: 16-32MB (2048-4096) # Large dataset and lots of available RAM (1-4GB): 64-256MB (8192-32768) ====== My postgresql.conf configuration is: #--------------------------------------------------------------------------- # FILE LOCATIONS #--------------------------------------------------------------------------- # The default values of these variables are driven from the -D command line # switch or PGDATA environment variable, represented here as ConfigDir. #data_directory = 'ConfigDir' # use data in another directory #hba_file = 'ConfigDir/pg_hba.conf' # host-based authentication file #ident_file = 'ConfigDir/pg_ident.conf' # IDENT configuration file # If external_pid_file is not explicitly set, no extra pid file is written. #external_pid_file = '(none)' # write an extra pid file #--------------------------------------------------------------------------- # CONNECTIONS AND AUTHENTICATION #--------------------------------------------------------------------------- # - Connection Settings - listen_addresses = '*' # what IP address(es) to listen on; # comma-separated list of addresses; # defaults to 'localhost', '*' = all port = 5432 max_connections = 3000 # note: increasing max_connections costs ~400 bytes of shared memory per # connection slot, plus lock space (see max_locks_per_transaction). You # might also need to raise shared_buffers to support more connections. #superuser_reserved_connections = 2 #unix_socket_directory = '' #unix_socket_group = '' #unix_socket_permissions = 0777 # octal #bonjour_name = '' # defaults to the computer name #--------------------------------------------------------------------------- # RESOURCE USAGE (except WAL) #--------------------------------------------------------------------------- # - Memory - shared_buffers = 81920 # min 16 or max_connections*2, 8KB each temp_buffers = 5000 # min 100, 8KB each max_prepared_transactions = 1000 # can be 0 or more # note: increasing max_prepared_transactions costs ~600 bytes of shared memory # per transaction slot, plus lock space (see max_locks_per_transaction). work_mem = 10240 # min 64, size in KB maintenance_work_mem = 253952 # min 1024, size in KB max_stack_depth = 4096 # min 100, size in KB # - Free Space Map - #max_fsm_pages = 20000 # min max_fsm_relations*16, 6 bytes each #max_fsm_relations = 1000 # min 100, ~70 bytes each # - Kernel Resource Usage - #max_files_per_process = 1000 # min 25 #preload_libraries = '' # - Cost-Based Vacuum Delay - #vacuum_cost_delay = 0 # 0-1000 milliseconds #vacuum_cost_page_hit = 1 # 0-10000 credits #vacuum_cost_page_miss = 10 # 0-10000 credits #vacuum_cost_page_dirty = 20 # 0-10000 credits #vacuum_cost_limit = 200 # 0-10000 credits # - Background writer - #bgwriter_delay = 200 # 10-10000 milliseconds between rounds #bgwriter_lru_percent = 1.0 # 0-100% of LRU buffers scanned/round #bgwriter_lru_maxpages = 5 # 0-1000 buffers max written/round #bgwriter_all_percent = 0.333 # 0-100% of all buffers scanned/round #bgwriter_all_maxpages = 5 # 0-1000 buffers max written/round #--------------------------------------------------------------------------- # WRITE AHEAD LOG #--------------------------------------------------------------------------- # - Settings - #fsync = on # turns forced synchronization on or off #wal_sync_method = fsync # the default is the first option # supported by the operating system: # open_datasync # fdatasync # fsync # fsync_writethrough # open_sync #full_page_writes = on # recover from partial page writes #wal_buffers = 8 # min 4, 8KB each #commit_delay = 0 # range 0-100000, in microseconds #commit_siblings = 5 # range 1-1000 # - Checkpoints - checkpoint_segments = 20 # in logfile segments, min 1, 16MB each #checkpoint_timeout = 300 # range 30-3600, in seconds #checkpoint_warning = 30 # in seconds, 0 is off # - Archiving - #archive_command = '' # command to use to archive a logfile # segment #--------------------------------------------------------------------------- # QUERY TUNING #--------------------------------------------------------------------------- # - Planner Method Configuration - #enable_bitmapscan = on #enable_hashagg = on #enable_hashjoin = on #enable_indexscan = on #enable_mergejoin = on enable_nestloop = off enable_seqscan = off #enable_sort = on #enable_tidscan = on # - Planner Cost Constants - effective_cache_size = 65536 # typically 8KB each #random_page_cost = 4 # units are one sequential page fetch # cost #cpu_tuple_cost = 0.01 # (same) #cpu_index_tuple_cost = 0.001 # (same) #cpu_operator_cost = 0.0025 # (same) the sysctl.conf kernel.shmmax = 970170573 kernel.shmall = 970170573 kernel.sem = 400 42000 32 1024 vm.overcommit_memory = 2 =========The configuration is correct?======= If you can help me i will be pleased, thanks. _________________________________________________________________ ¿ Ya tienes la última versión de Messenger? www.imagine-msn.com/messenger/launch80/default.aspx?locale=es-mx Windows Live Messenger en Prodigy/MSN
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