Dynamic Resource Allocation in the Cloud with Near-Optimal Efficiency

TL;DR

This paper introduces a practical algorithm for dynamic resource allocation in cloud computing that balances high utilization with SLA compliance, using a multiplicative weight update approach and validated on real data.

Contribution

It presents a near-optimal, simple algorithm for resource allocation that effectively manages the tradeoff between utilization and SLA satisfaction in cloud systems.

Findings

Achieves near-optimal resource utilization compared to offline optimal.

Satisfies all SLAs with minimal error.

Validated performance on real cloud data.

Abstract

Cloud computing has motivated renewed interest in resource allocation problems with new consumption models. A common goal is to share a resource, such as CPU or I/O bandwidth, among distinct users with different demand patterns as well as different quality of service requirements. To ensure these service requirements, cloud offerings often come with a service level agreement (SLA) between the provider and the users. An SLA specifies the amount of a resource a user is entitled to utilize. In many cloud settings, providers would like to operate resources at high utilization while simultaneously respecting individual SLAs. There is typically a tradeoff between these two objectives; for example, utilization can be increased by shifting away resources from idle users to "scavenger" workload, but with the risk of the former then becoming active again. We study this fundamental tradeoff by formulating a resource allocation model that captures basic properties of cloud computing systems, including SLAs, highly limited feedback about the state of the system, and variable and unpredictable input sequences. Our main result is a simple and practical algorithm that achieves near-optimal performance on the above two objectives. First, we guarantee nearly optimal utilization of the resource even if compared to the omniscient offline dynamic optimum. Second, we simultaneously satisfy all individual SLAs up to a small error. The main algorithmic tool is a multiplicative weight update algorithm, and a primal-dual argument to obtain its guarantees. We also provide numerical validation on real data to demonstrate the performance of our algorithm in practical applications.