Github user sudhansu7 commented on the pull request:
https://github.com/apache/cloudstack/pull/897#issuecomment-152273822
@remibergsma @runseb
I have below performance analysis, which I did some time back. I trying to
find out the dbdump to do a real test. But below analysis will may help to
understand the issue and the solution.
Clicking 'Network' tab invokes 3 api as mentioned below.
http://localhost:8080/client/api?command=listZones&response=json&sessionkey=1ddeSxQjc604bdnHJegYqkM6EgA%3D&networktype=Advanced&_=1436356355027
-- 371ms
this is to enable vpc, vpnCustomerGateway menu option.
http://localhost:8080/client/api?command=listNetworks&response=json&sessionkey=1ddeSxQjc604bdnHJegYqkM6EgA%3D&supportedServices=SecurityGroup&listAll=true&details=min&_=1436356355424
-- 18.97s
this is to enable securityGroups menu option.
http://localhost:8080/client/api?command=listNetworks&response=json&sessionkey=1ddeSxQjc604bdnHJegYqkM6EgA%3D&listAll=true&page=1&pagesize=20&_=1436356374437
-- 1.54s
to list networks
Second API call is taking 90% of the total response time.This api fetches
all networks and interates over each network and for each network it makes an
db call to fetch the services associated with the network. This is an expensive
operation.
Solution:
We can fetch listZones of type basic, if present then we can enable
securityGroups menu option. For advanced zone with securitygroup service we can
reuse first api call and can check "securitygroupsenabled" attribute in
response. If present we will enable securityGroups menu option.
http://localhost:8080/client/api?command=listZones&response=json&sessionkey=JwxpVL74Wk6ZS7MvzSw0u6%2FA9eU%3D&networktype=Advanced&_=1436357831259
--256ms
http://localhost:8080/client/api?command=listZones&response=json&sessionkey=JwxpVL74Wk6ZS7MvzSw0u6%2FA9eU%3D&networktype=Basic&_=1436357831901
--11ms
http://localhost:8080/client/api?command=listNetworks&response=json&sessionkey=JwxpVL74Wk6ZS7MvzSw0u6%2FA9eU%3D&listAll=true&page=1&pagesize=20&_=1436357831968
--868s
total : 1.19s
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