Re: postgres 7.4 at 100%

Hi Richard,
Thanks so much for replying. Pls see below.
Thanks in advance for any advice,
Chris

> People are going to need more information. Are you talking about
> CPU/disk IO/memory?

## CPU is at 100%.

>
> > My settings are default on both boxes I think.
>
> Doubtful - PG crawls with the default settings. Check your old
> postgresql.conf file and compare. Also, read the tuning article at:
> http://www.varlena.com/varlena/GeneralBits/Tidbits/index.php
>
> > There are only about 20 inserts per second, which is really low.
> > Anyone have any ideas as to something I have to do to Postgres 7.4 to
> > change it from the default so that it's not eating up all my CPU? I
> > have no clue how to debug this...
>
> What does top/vmstat/iostat show during heavy usage?
>
TOP:

137 processes: 135 sleeping, 2 running, 0 zombie, 0 stopped
CPU states: 81.4% user 17.9% system 0.0% nice 0.0% iowait 0.5% idle
Mem: 507036k av, 500244k used, 6792k free, 0k shrd, 68024k buff
133072k active, 277368k inactive
Swap: 787176k av, 98924k used, 688252k free 232500k cached

PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND
20734 postgres 15 0 4028 4028 3244 R 83.6 0.7 348:03 0 postmaster
21249 numnet 9 0 78060 76M 8440 S 7.5 15.3 32:51 0 myapp
18478 user 12 0 1224 1224 884 S 5.7 0.2 57:01 0 top

[root(at)live root]# vmstat
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
1 0 0 98924 5980 68024 233528 4 3 6 22 28 10 13 6 24

iostat:
Time: 03:18:18 AM
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
dev3-0 11.00 0.80 142.40 4 712

Time: 03:18:23 AM
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
dev3-0 10.60 0.00 143.20 0 716

or blocks:

Time: 03:20:58 AM
Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
dev3-0 25.40 3.20 756.80 16 3784

Time: 03:21:03 AM
Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
dev3-0 30.20 3.20 841.60 16 4208

extended:

Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s
avgrq-sz avgqu-sz await svctm %util
/dev/hda3 0.00 79.20 0.60 30.60 4.80 878.40 2.40 439.20
28.31 0.36 1.15 0.45 1.40

avg-cpu: %user %nice %sys %idle
31.00 0.00 18.20 50.80

Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s
avgrq-sz avgqu-sz await svctm %util
/dev/hda3 0.00 45.80 0.00 10.80 0.00 452.80 0.00 226.40
41.93 0.08 0.74 0.37 0.40

avg-cpu: %user %nice %sys %idle
83.20 0.00 16.60 0.20

Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s
avgrq-sz avgqu-sz await svctm %util
/dev/hda 0.00 28.20 0.00 10.10 0.00 315.20 0.00 157.60
31.21 4294917.33 0.30 99.01 100.00
/dev/hda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00 0.00
/dev/hda2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
0.00 0.00 0.00 0.00 0.00
/dev/hda3 0.00 28.20 0.00 10.10 0.00 315.20 0.00 157.60
31.21 0.03 0.30 0.20 0.20

My conf file:

[root(at)live setup]# cat /var/lib/pgsql/data/postgresql.conf
# -----------------------------
# PostgreSQL configuration file
# -----------------------------
#
# This file consists of lines of the form:
#
# name = value
#
# (The '=' is optional.) White space may be used. Comments are introduced
# with '#' anywhere on a line. The complete list of option names and
# allowed values can be found in the PostgreSQL documentation. The
# commented-out settings shown in this file represent the default values.
#
# Any option can also be given as a command line switch to the
# postmaster, e.g. 'postmaster -c log_connections=on'. Some options
# can be changed at run-time with the 'SET' SQL command.
#
# This file is read on postmaster startup and when the postmaster
# receives a SIGHUP. If you edit the file on a running system, you have
# to SIGHUP the postmaster for the changes to take effect, or use
# "pg_ctl reload".

#---------------------------------------------------------------------------
# CONNECTIONS AND AUTHENTICATION
#---------------------------------------------------------------------------

# - Connection Settings -

tcpip_socket = true
max_connections = 20
# note: increasing max_connections costs about 500 bytes of shared
# memory per connection slot, in addition to costs from shared_buffers
# and max_locks_per_transaction.
#superuser_reserved_connections = 2
#port = 5432
#unix_socket_directory = ''
#unix_socket_group = ''
#unix_socket_permissions = 0777 # octal
#virtual_host = '' # what interface to listen on; defaults to any
#rendezvous_name = '' # defaults to the computer name

# - Security & Authentication -

#authentication_timeout = 60 # 1-600, in seconds
#ssl = false
#password_encryption = true
#krb_server_keyfile = ''
#db_user_namespace = false

#---------------------------------------------------------------------------
# RESOURCE USAGE (except WAL)
#---------------------------------------------------------------------------

# - Memory -

shared_buffers = 40 # min 16, at least max_connections*2, 8KB each
#sort_mem = 1024 # min 64, size in KB
#vacuum_mem = 8192 # min 1024, size in KB

# - Free Space Map -

#max_fsm_pages = 20000 # min max_fsm_relations*16, 6 bytes each
#max_fsm_relations = 1000 # min 100, ~50 bytes each

# - Kernel Resource Usage -

#max_files_per_process = 1000 # min 25
#preload_libraries = ''

#---------------------------------------------------------------------------
# WRITE AHEAD LOG
#---------------------------------------------------------------------------

# - Settings -

#fsync = true # turns forced synchronization on or off
#wal_sync_method = fsync # the default varies across platforms:
# fsync, fdatasync, open_sync, or open_datasync
#wal_buffers = 8 # min 4, 8KB each

# - Checkpoints -

#checkpoint_segments = 3 # in logfile segments, min 1, 16MB each
#checkpoint_timeout = 300 # range 30-3600, in seconds
#checkpoint_warning = 30 # 0 is off, in seconds
#commit_delay = 0 # range 0-100000, in microseconds
#commit_siblings = 5 # range 1-1000

#---------------------------------------------------------------------------
# QUERY TUNING
#---------------------------------------------------------------------------

# - Planner Method Enabling -

#enable_hashagg = true
#enable_hashjoin = true
#enable_indexscan = true
#enable_mergejoin = true
#enable_nestloop = true
#enable_seqscan = true
#enable_sort = true
#enable_tidscan = true

# - Planner Cost Constants -

#effective_cache_size = 1000 # 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)

# - Genetic Query Optimizer -

#geqo = true
#geqo_threshold = 11
#geqo_effort = 1
#geqo_generations = 0
#geqo_pool_size = 0 # default based on tables in statement,
# range 128-1024
#geqo_selection_bias = 2.0 # range 1.5-2.0

# - Other Planner Options -

#default_statistics_target = 10 # range 1-1000
#from_collapse_limit = 8
#join_collapse_limit = 8 # 1 disables collapsing of explicit JOINs

#---------------------------------------------------------------------------
# ERROR REPORTING AND LOGGING
#---------------------------------------------------------------------------

# - Syslog -

syslog = 0 # range 0-2; 0=stdout; 1=both; 2=syslog
syslog_facility = 'LOCAL0'
syslog_ident = 'postgres'

# - When to Log -

client_min_messages = warning # Values, in order of decreasing detail:
# debug5, debug4, debug3, debug2, debug1,
# log, info, notice, warning, error

log_min_messages = log # Values, in order of decreasing detail:
# debug5, debug4, debug3, debug2, debug1,
# info, notice, warning, error, log, fatal,
# panic

log_error_verbosity = default # terse, default, or verbose messages

log_min_error_statement = warning # Values in order of increasing severity:
# debug5, debug4, debug3, debug2, debug1,
# info, notice, warning, error, panic(off)

#log_min_duration_statement = -1 # Log all statements whose
# execution time exceeds the value, in
# milliseconds. Zero prints all queries.
# Minus-one disables.

#silent_mode = false # DO NOT USE without Syslog!

# - What to Log -

#debug_print_parse = false
#debug_print_rewritten = false
#debug_print_plan = false
#debug_pretty_print = false
#log_connections = false
#log_duration = false
#log_pid = false
#log_statement = false
#log_timestamp = false
#log_hostname = false
#log_source_port = false

#---------------------------------------------------------------------------
# RUNTIME STATISTICS
#---------------------------------------------------------------------------

# - Statistics Monitoring -

#log_parser_stats = false
#log_planner_stats = false
#log_executor_stats = false
#log_statement_stats = false

# - Query/Index Statistics Collector -

#stats_start_collector = true
#stats_command_string = false
#stats_block_level = false
#stats_row_level = false
#stats_reset_on_server_start = true

#---------------------------------------------------------------------------
# CLIENT CONNECTION DEFAULTS
#---------------------------------------------------------------------------

# - Statement Behavior -

#search_path = '$user,public' # schema names
#check_function_bodies = true
#default_transaction_isolation = 'read committed'
#default_transaction_read_only = false
#statement_timeout = 0 # 0 is disabled, in milliseconds

# - Locale and Formatting -

#datestyle = 'iso, mdy'
#timezone = unknown # actually, defaults to TZ environment setting
#australian_timezones = false
#extra_float_digits = 0 # min -15, max 2
#client_encoding = sql_ascii # actually, defaults to database encoding

# These settings are initialized by initdb -- they may be changed
lc_messages = 'en_US.UTF-8' # locale for system error
message strings
lc_monetary = 'en_US.UTF-8' # locale for monetary formatting
lc_numeric = 'en_US.UTF-8' # locale for number formatting
lc_time = 'en_US.UTF-8' # locale for time formatting

# - Other Defaults -

#explain_pretty_print = true
#dynamic_library_path = '$libdir'
#max_expr_depth = 10000 # min 10

#---------------------------------------------------------------------------
# LOCK MANAGEMENT
#---------------------------------------------------------------------------

#deadlock_timeout = 1000 # in milliseconds
#max_locks_per_transaction = 64 # min 10, ~260*max_connections bytes each

#---------------------------------------------------------------------------
# VERSION/PLATFORM COMPATIBILITY
#---------------------------------------------------------------------------

# - Previous Postgres Versions -

#add_missing_from = true
#regex_flavor = advanced # advanced, extended, or basic
#sql_inheritance = true

# - Other Platforms & Clients -

#transform_null_equals = false