I suggest that you measure VM startup time and other parameters on a real public cloud and/or on a private cloud that you set up yourself.  You could set up OpenStack and make measurements yourself, and you could use the free tier of Amazon Web Services (link below) as long as you stayed beneath the usage specified.  By themselves, those performance numbers for a specific OpenStack version and for AWS would be a useful dataset to share.

https://aws.amazon.com/free/faqs/

To calculate VM start up time and many more things, you should implement a real cloud and then create your required scenario (may use OpenNebula) . 

To implement a private cloud, you can follow the following link.

http://hsusmita.blogspot.in/2012/02/building-private-cloud-using-opennebula.html

Thanks for your responses & Much appreciated.

I am trying to do it in Openstack first and proceed from there.

Again Thanks for your response.

You can use cloudsim,  and apply a timer for each VM easily 

You can use Cloud Analyst simulator to measure startup time

VM startup time depends on the instance type (spot, on-demand), operation system, size of the OS image, cloud provider, etc. There are studies of the startup of VMs in clouds.

http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6253534

http://blog.cloud66.com/ready-steady-go-the-speed-of-vm-creation-and-ssh-key-access-on-aws-digitalocean-linode-vexxhost-google-cloud-rackspace-and-microsoft-azure/

thanks all.. appreciate your help on this. 

Hi

You can use a Public IaaS Cloud Simulator PICS, more details visit URL:

http://www.cs.virginia.edu/~ik2sb/PICS/

Regards...

Thanks, Prof.

I prefer to see the experimental setup section of the following paper.

http://www.sciencedirect.com/science/article/pii/S1084804517302448