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Process Group Management in Cross-Layer Adaptation Wanghong Yuan, Klara Nahrstedt

Summary: Process Group Management in Cross-Layer Adaptation
Wanghong Yuan, Klara Nahrstedt
Department of Computer Science
University of Illinois at Urbana-Champaign
Our previous MMCN03 paper reported a cross-layer adaptation framework, GRACE-1, that coordinates the adaptation
of CPU frequency/voltage, CPU scheduling, and application quality. GRACE-1 assumes that all application processes
(or threads) are independent from each other and adapt individually. This assumption, however, is invalid for multi-
threaded applications that include dependent and cooperative processes. To support the joint performance requirements
of such dependent processes, this paper extends GRACE-1 with a process group management mechanism. The enhanced
framework, called GRACE-grp, introduces a new OS abstraction, group control block, to provide the OS-level recognition
and support of process groups. Through a group control block, dependent processes can explicitly set up a group and
specify their dependency in the OS kernel. Consequently, GRACE-grp schedules and adapts them in a synchronized and
consistent manner, thereby delivering joint performance guarantees. We have implemented and evaluated the GRACE-grp
framework. Our experimental results show that compared to GRACE-1, GRACE-grp provides better support for the joint
quality of dependent processes and reduces CPU energy consumption by 6.2% to 8.7% for each process group.
Keywords: Adaptation, Process Group Management, Energy Saving, Quality of Service.
Mobile devices, primarily running multimedia applications, are becoming an integral part of the pervasive computing


Source: Adve, Sarita - Department of Computer Science, University of Illinois at Urbana-Champaign


Collections: Computer Technologies and Information Sciences