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How to reduce IOWAIT and CPU idle time? - Mailing list pgsql-performance

From Samir Magar
Subject How to reduce IOWAIT and CPU idle time?
Date
Msg-id CAA=to3ipKYw5LV=MJMe3gcMPKoiA-JQmDOduQB=mwxzzAV=T6A@mail.gmail.com
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Hello,


My Application has normally 25 to 30 connections and it is doing lot of insert/update/delete operation.
The database size is 100GB. 
iowait  is at 40% to 45 % and CPU idle time is at 45% to 50%
TOTAL RAM = 8 GB   TOTAL CPU = 4 

postgresql.conf parametre:

shared_buffers = 2GB
work_mem = 100MB
effective_cache_size = 2GB
maintenance_work_mem = 500MB
autovacuum = off
wal_buffers = 64MB


How can i reduce iowait and CPU idle time. It is slowing all the queries. The queries that used to take 1 sec,it is taking 12-15 seconds.


version detials: 
Linux zabbix-inst.novalocal 3.10.0-229.7.2.el7.x86_64 #1 SMP Fri May 15 21:38:46 EDT 2015 x86_64 x86_64 x86_64 GNU/Linux
database version: postgrsql 9.2.13 community.

Thanks,
Samir Magar

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