Re: Help with postgresql memory issue

[Brooks Lyrette <brooks.lyrette@xxxxxxxxx>]

There should be no other processes running, this system is dedicated  
to running postgresql.

Max connections is configured to: max_connections = 400			

Brooks L.

On 28-Oct-09, at 3:46 PM, Thom Brown wrote:

> 2009/10/28 Brooks Lyrette <brooks.lyrette@xxxxxxxxx>:
> > 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


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