Re: Help with postgresql memory issue

2009/10/28 Brooks Lyrette <brooks(dot)lyrette(at)gmail(dot)com>:
> Hello All,
>
> I'm new to postgres and it seems my server is unable to fork new
> connections.
>
> Here is the log:
>
> LOG:  could not fork new process for connection: Not enough space
> LOG:  could not fork new process for connection: Not enough space
> TopMemoryContext: 84784 total in 8 blocks; 5584 free (10 chunks); 79200 used
>  Prepared Queries: 8192 total in 1 blocks; 1800 free (0 chunks); 6392 used
>  TopTransactionContext: 8192 total in 1 blocks; 7856 free (0 chunks); 336
> used
>  Record information cache: 8192 total in 1 blocks; 1800 free (0 chunks);
> 6392 used
>  MessageContext: 8192 total in 1 blocks; 7128 free (0 chunks); 1064 used
>  smgr relation table: 8192 total in 1 blocks; 3840 free (0 chunks); 4352
> used
>  TransactionAbortContext: 32768 total in 1 blocks; 32752 free (0 chunks); 16
> used
>  Portal hash: 8192 total in 1 blocks; 3912 free (0 chunks); 4280 used
>  PortalMemory: 8192 total in 1 blocks; 8040 free (0 chunks); 152 used
>    PortalHeapMemory: 1024 total in 1 blocks; 976 free (0 chunks); 48 used
>  Relcache by OID: 8192 total in 1 blocks; 3376 free (0 chunks); 4816 used
>  CacheMemoryContext: 405328 total in 19 blocks; 70888 free (1 chunks);
> 334440 used
>    unnamed prepared statement: 24576 total in 2 blocks; 7912 free (1
> chunks); 16664 used
>    CachedPlan: 1024 total in 1 blocks; 904 free (0 chunks); 120 used
>    CachedPlanSource: 1024 total in 1 blocks; 840 free (0 chunks); 184 used
>    pg_ts_dict_oid_index: 1024 total in 1 blocks; 344 free (0 chunks); 680
> used
>    pg_aggregate_fnoid_index: 1024 total in 1 blocks; 344 free (0 chunks);
> 680 used
>    pg_language_name_index: 1024 total in 1 blocks; 344 free (0 chunks); 680
> used
>    pg_statistic_relid_att_index: 1024 total in 1 blocks; 280 free (0
> chunks); 744 used
>    pg_ts_dict_dictname_index: 1024 total in 1 blocks; 280 free (0 chunks);
> 744 used
>    pg_namespace_nspname_index: 1024 total in 1 blocks; 304 free (0 chunks);
> 720 used
>    pg_opfamily_oid_index: 1024 total in 1 blocks; 344 free (0 chunks); 680
> used
>    pg_opclass_oid_index: 1024 total in 1 blocks; 344 free (0 chunks); 680
> used
>    pg_ts_parser_prsname_index: 1024 total in 1 blocks; 280 free (0 chunks);
> 744 used
>    pg_amop_fam_strat_index: 1024 total in 1 blocks; 128 free (0 chunks); 896
> used
>    pg_opclass_am_name_nsp_index: 1024 total in 1 blocks; 192 free (0
> chunks); 832 used
>    pg_trigger_tgrelid_tgname_index: 1024 total in 1 blocks; 240 free (0
> chunks); 784 used
>    pg_cast_source_target_index: 1024 total in 1 blocks; 280 free (0 chunks);
> 744 used
>    pg_auth_members_role_member_index: 1024 total in 1 blocks; 280 free (0
> chunks); 744 used
>    pg_attribute_relid_attnum_index: 1024 total in 1 blocks; 280 free (0
> chunks); 744 used
>    pg_ts_config_cfgname_index: 1024 total in 1 blocks; 280 free (0 chunks);
> 744 used
>    pg_authid_oid_index: 1024 total in 1 blocks; 304 free (0 chunks); 720
> used
>    pg_ts_config_oid_index: 1024 total in 1 blocks; 344 free (0 chunks); 680
> used
>    pg_conversion_default_index: 1024 total in 1 blocks; 128 free (0 chunks);
> 896 used
>    pg_language_oid_index: 1024 total in 1 blocks; 344 free (0 chunks); 680
> used
>    pg_enum_oid_index: 1024 total in 1 blocks; 344 free (0 chunks); 680 used
>    pg_proc_proname_args_nsp_index: 1024 total in 1 blocks; 192 free (0
> chunks); 832 used
>    pg_ts_parser_oid_index: 1024 total in 1 blocks; 344 free (0 chunks); 680
> used
>    pg_database_oid_index: 1024 total in 1 blocks; 304 free (0 chunks); 720
> used
>    pg_conversion_name_nsp_index: 1024 total in 1 blocks; 280 free (0
> chunks); 744 used
>    pg_class_relname_nsp_index: 1024 total in 1 blocks; 280 free (0 chunks);
> 744 used
>    pg_attribute_relid_attnam_index: 1024 total in 1 blocks; 280 free (0
> chunks); 744 used
>    pg_class_oid_index: 1024 total in 1 blocks; 344 free (0 chunks); 680 used
>    pg_amproc_fam_proc_index: 1024 total in 1 blocks; 128 free (0 chunks);
> 896 used
>    pg_operator_oprname_l_r_n_index: 1024 total in 1 blocks; 128 free (0
> chunks); 896 used
>    pg_index_indexrelid_index: 1024 total in 1 blocks; 344 free (0 chunks);
> 680 used
>    pg_type_oid_index: 1024 total in 1 blocks; 304 free (0 chunks); 720 used
>    pg_rewrite_rel_rulename_index: 1024 total in 1 blocks; 280 free (0
> chunks); 744 used
>    pg_authid_rolname_index: 1024 total in 1 blocks; 304 free (0 chunks); 720
> used
>    pg_auth_members_member_role_index: 1024 total in 1 blocks; 280 free (0
> chunks); 744 used
>    pg_enum_typid_label_index: 1024 total in 1 blocks; 280 free (0 chunks);
> 744 used
>    pg_constraint_oid_index: 1024 total in 1 blocks; 344 free (0 chunks); 680
> used
>    pg_conversion_oid_index: 1024 total in 1 blocks; 344 free (0 chunks); 680
> used
>    pg_ts_template_tmplname_index: 1024 total in 1 blocks; 280 free (0
> chunks); 744 used
>    pg_ts_config_map_index: 1024 total in 1 blocks; 192 free (0 chunks); 832
> used
>    pg_namespace_oid_index: 1024 total in 1 blocks; 304 free (0 chunks); 720
> used
>    pg_type_typname_nsp_index: 1024 total in 1 blocks; 280 free (0 chunks);
> 744 used
>    pg_operator_oid_index: 1024 total in 1 blocks; 344 free (0 chunks); 680
> used
>    pg_amop_opr_fam_index: 1024 total in 1 blocks; 280 free (0 chunks); 744
> used
>    pg_proc_oid_index: 1024 total in 1 blocks; 344 free (0 chunks); 680 used
>    pg_opfamily_am_name_nsp_index: 1024 total in 1 blocks; 192 free (0
> chunks); 832 used
>    pg_ts_template_oid_index: 1024 total in 1 blocks; 344 free (0 chunks);
> 680 used
>  MdSmgr: 0 total in 0 blocks; 0 free (0 chunks); 0 used
>  LOCALLOCK hash: 8192 total in 1 blocks; 3912 free (0 chunks); 4280 used
>  Timezones: 48616 total in 2 blocks; 5968 free (0 chunks); 42648 used
>  ErrorContext: 8192 total in 1 blocks; 8176 free (3 chunks); 16 used
> ERROR:  out of memory
>
> and the memory area from the config file:
>
> #------------------------------------------------------------------------------
> # RESOURCE USAGE (except WAL)
> #------------------------------------------------------------------------------
>
> # - Memory -
>
> shared_buffers = 128MB                  # min 128kB or max_connections*16kB
>                                        # (change requires restart)
> temp_buffers = 16MB                     # min 800kB
> #max_prepared_transactions = 5          # can be 0 or more
>                                        # (change requires restart)
> # Note:  Increasing max_prepared_transactions costs ~600 bytes of shared
> memory
> # per transaction slot, plus lock space (see max_locks_per_transaction).
> #work_mem = 1MB                         # min 64kB
> work_mem = 16MB
> maintenance_work_mem = 300MB            # min 1MB
> #max_stack_depth = 2MB                  # min 100kB
>
> # - Free Space Map -
>
> max_fsm_pages = 400000                  # min max_fsm_relations*16, 6 bytes
> each
>                                        # (change requires restart)
> #max_fsm_relations = 1000               # min 100, ~70 bytes each
>                                        # (change requires restart)
>
> # - Kernel Resource Usage -
>
> #max_files_per_process = 1000           # min 25
>                                        # (change requires restart)
> #shared_preload_libraries = ''          # (change requires restart)
>
> # - 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                # 1-10000 credits
>
> # - Background Writer -
>
> #bgwriter_delay = 200ms                 # 10-10000ms between rounds
> #bgwriter_lru_maxpages = 100            # 0-1000 max buffers written/round
> #bgwriter_lru_multiplier = 2.0          # 0-10.0 multipler on buffers
> scanned/round
>
>
> Is there anything I can do to ensure I'm getting the most out of the 1GB of
> RAM on my server?
>

What is the maximum number of connections as configured in your copy
of postgresql.conf? And also are you running any other run-away
processes that are taking up all available memory?

Thom