Resource allocation for accessing cloud based services

A computer-program product comprising one or more non-transitory machine-readable storage media, including stored instructions configured to cause a computing system to perform operations including:

• allocating, to respectively a first client and a second client, a first target amount of resource and a second target amount of resource for using a service;
• receiving, from a third client, a request for allocating resources for using the service;
• estimating that a system level amount of unallocated resource, which has not been allocated yet to any client, is less than a threshold value, wherein the system level amount of unallocated resource excludes (i) a first buffered amount of resource that is reserved for allocation to one or more new clients, when no other resources are available for allocation to the one or more new clients, and wherein the first buffered amount of resource is not for allocation to any active client using the service, and (ii) a second buffered amount of resource that are not to be explicitly allocated to any new or active client;
• and
• allocating at least a portion of the second or fourth subsets to the third client, responsive at least in part to estimating that the system level amount of unallocated resource is less than a threshold value.

A system comprising:

• one or more processors;
• and
• a storage to store a resource allocation table that is indicative of one or more of (i) a target resource amount allocated to each of a plurality of active clients, (ii) an estimated amount of used resource currently being used by each active client of the plurality of active clients, (ii) an estimated amount of unused resource currently being allocated and not being used by each active client of the plurality of active clients;
• one or more non-transitory computer-readable media storing instructions, which, when executed by the one or more processors, cause the system to perform a set of actions including:
• receiving, from an active client of the plurality of active clients and a new client, requests for allocating resources for using a service;
• determining, from the resource allocation table, that the target resource amount allocated to each of the plurality of active clients is equal to a minimum target resource for using the service;
• determining that a buffered amount of resource, which is reserved for allocation to one or more new clients, has a non-zero value;
• allocating at least a portion of the buffered amount of resource to the new client;
• and
• rejecting the request from the active client, responsive at least in part to determining that the target resource amount allocated to each of the plurality of active clients is equal to the minimum target resource for using the service.