I have Postgresql 9.3 installed on AWS instance ubuntu 14.04

The load average of the instance increase every 105 minutes even without any 
database. I’ve checked the scheduled jobs but couldn’t find anything 
suspicious. When the load average was at peak, I couldn’t see any process 
consuming resources. This happens on all my servers that has postgresql 
installed, even after I purge postgresql. Has anyone seen this before?

Here’s my config:
postgresql.conf

data_directory = '/var/lib/postgresql/9.3/main'         
hba_file = '/etc/postgresql/9.3/main/pg_hba.conf'       
ident_file = '/etc/postgresql/9.3/main/pg_ident.conf'   
external_pid_file = '/var/run/postgresql/9.3-main.pid'                  
listen_addresses = '*'                  
port = 5432                             
max_connections = 100                   
unix_socket_directories = '/var/run/postgresql' 
ssl = true                              
ssl_cert_file = '/etc/ssl/certs/ssl-cert-snakeoil.pem'          
ssl_key_file = '/etc/ssl/private/ssl-cert-snakeoil.key'         
shared_buffers = 128MB                  
shared_preload_libraries = 'pg_stat_statements'
wal_level = hot_standby                 
checkpoint_segments = 8         
max_wal_senders = 3     
wal_keep_segments = 8           
log_min_duration_statement = 300        
log_line_prefix = '%m '                 
log_timezone = 'UTC'
datestyle = 'iso, mdy'
timezone = 'UTC'
lc_messages = 'en_US.UTF-8'                     
lc_monetary = 'en_US.UTF-8'                     
lc_numeric = 'en_US.UTF-8'                      
lc_time = 'en_US.UTF-8'                         
default_text_search_config = 'pg_catalog.english'

Nhan Nguyen
System Engineer

MB: (+84) 934 008 031
Skype: live:ducnhan813

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