Sonar Installation and maven Configuration steps

Installation steps :

          
Step 1 :  Download and unzip the distribution.

                Do not install the application in a directory starting with a digit

Step 2 : Execute on Windows:

bin\windowsx8632\StartSonar.bat

or on other platforms:

bin/[OS]/sonar.sh console

Step 3 : Execute the following commands on your Maven projects:

mvn clean install mvn sonar:sonar

Step 4 : Browse to http://localhost:9000
Step 5 : For administration features, default login/password is admin/admin.

Liferay performance tuning

        Below are the high level steps to tune the liferay server :  

Step 1 : Adjust the server's thread pool and JDBC connection pool

1. Unfortunately, there's no magic number for this: it must be tuned based on usage. 
2. By default, Liferay is configured for a maximum of 100 database connections. 
3. For Tomcat, a good number is between 200 and 400 threads in the thread pool