Website has become slower on a VPS, was much fast on a shared host. What's wrong?
- by Arpit Tambi
My shared host suspended my website stating system overload, so I moved my website to a VPS which has 4GB RAM. But for some reason the website has become very slow.
This is the vmstat output -
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
r b swpd free buff cache si so bi bo in cs us sy id wa st
1 0 0 3050500 0 0 0 0 0 1 0 0 0 0 100 0 0
Here's the Apache Benchmark output for a STATIC html page I ran on the server itself -
Benchmarking www.ask-oracle.com (be patient)...apr_poll: The timeout specified has expired (70007)
Total of 20 requests completed
Update:
Server Config:
List item
Centos 5.6
4 cores cpu
4 GB RAM
LAMP stack with APC
Wordpress
Only one website
It takes almost double time to load now, same website was much fast on shared hosting. I know I need to tweak some settings but have no clue where to start from?
I have already tried to optimize apache, mysql etc.
Update 2:
CPU usage is low, see uptime output:
11:09:02 up 7 days, 21:26, 1 user, load average: 0.09, 0.11, 0.09
Update 3:
When I load any webpage, browser shows "Waiting" for a long time and then page loads quickly. So I suspect server can accept only limited connections and holds extra connections in a waiting state. How to check this?
Update 4:
Following is the output on executing netperf
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to localhost.localdomain (127.0.0.1) port 0 AF_INET
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec
87380 16384 16384 10.00 9615.40
[root@ip-118-139-177-244 j3ngn5ri6r01t3]#
Here are the Apache MPM settings from httpd.conf, do they look okay?
<IfModule worker.c>
StartServers 5
MaxClients 100
MinSpareThreads 50
MaxSpareThreads 250
ThreadsPerChild 125
MaxRequestsPerChild 10000
ServerLimit 100
</IfModule>
