William Lloyd Bircher

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This paper proposes the use of microprocessor performance counters for online measurement of complete system power consumption. While past studies have demonstrated the use of performance counters for microprocessor power, to the best of our knowledge, we are the first to create power models for the entire system based on processor performance events. Our(More)
— This paper proposes the use of microprocessor performance counters for online measurement of complete system power consumption. The approach takes advantage of the " trickle-down " effect of performance events in microprocessors. While it has been known that CPU power consumption is correlated to processor performance, the use of well-known(More)
High power consumption and low energy efficiency have become significant impediments to future performance improvements in modern microprocessors. This paper contributes to the solution of these problems by presenting: linear regression models for power consumption and a detailed study of energy efficiency in a modern out-of-order superscalar(More)
Predictive power management provides reduced power consumption and increased performance compared to reactive schemes. It effectively reduces the lag between workload phase changes and changes in power adaptations since adaptations can be applied immediately before a program phase change. To this end we present the first analysis of prediction for power(More)
Power management of multi-core processors is extremely important because it allows power/energy savings when all cores are not used. OS directed power management according to ACPI (Advanced Power and Configurations Interface) specifications is the common approach that industry has adopted for this purpose. While operating systems are capable of such power(More)
This paper examines the interaction between thermal management techniques and power boosting in a state-of-the-art heterogeneous processor consisting of a set of CPU and GPU cores. We show that for classes of applications that utilize both the CPU and the GPU, modern boost algorithms that greedily seek to convert thermal headroom into performance can(More)
To effectively design a computer system for the worst case power consumption scenario, system architects often use hand-crafted maximum power consuming benchmarks at the assembly language level. These stressmarks, also called power viruses, are very tedious to generate and require significant domain knowledge. In this paper, we propose SYMPO, an automatic(More)
Sudden variations in current (large di/dt) can lead to significant power supply voltage droops and timing errors in modern microprocessors. Several papers discuss the complexity involved with developing test programs, also known as stress marks, to stress the system. Authors of these papers produced tools and methodologies to generate stress marks(More)
Many techniques have been developed for adaptive power management of computing systems. These techniques rely on the presence of varying power phases to detect opportunities for adaptation. However, little information is available regarding the extent of power phases in real systems. This paper illustrates available power phases ranging from 1 millisecond(More)