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BACKGROUND

0001. The present application generally relates to soft ware-as-a-service (SaaS) system. More particularly, the present application relates to improving the resource sharing capability in a SaaS system under a constraint of performance isolation between individual tenants.

0002 SaaS is a method for software deployment using the Internet. Under SaaS, a software provider licenses a software application to clients for use as a service on demand, eg, through a time subscription. SaaS allows the provider to develop, host and operate a software application for use by clients, who just need a computer with internet access to download and run the Software application and/or to access a host to run the Software application. The Software application can be licensed to a single user or a group of users, and each user may have many clients and/or client sessions. 0003 Typically, SaaS systems are hosted in …