Ryan E. Grant

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Recently, under a fixed power budget, asymmetric multiprocessors (AMP) have been proposed to improve the performance of multi-threaded applications compared to symmetric multiprocessors. An AMP is a multiprocessor system in which its processors are not operating at the same frequency. Power consumption has become an important design constraint in servers(More)
The U. S. Department of Energy has identified resilience and energy consumption as key challenges for future extreme-scale systems. All checkpoint/restart methods require I/O to local or remote storage. Efforts are under way to minimize the amount of data movement and increase scalability. Nevertheless, the energy consumed by fault resilience methods will(More)
Hybrid chip multithreaded SMPs present new challenges as well as new opportunities to maximize performance. Our intention is to discover the optimal operating configuration of such systems for scientific applications and to identify the shared resources that might become a bottleneck to performance under the different hardware configurations. This knowledge(More)
Simultaneous Multithreading (SMT) is a technique that allows multiple independent threads to execute different instructions each cycle. Hyper-Threading (HT) is an implementation of SMT available on recent processors from Intel. Naturally, Multi-threaded applications are very suitable for SMT systems. However, HT due to extensive resource sharing may not(More)
The introduction of Quality of Service (QoS) features for socket-based communication over InfiniBand networks provides the opportunity to enact service differentiation for traditional socket-based applications over high performance networks for the first time. The effectiveness of such techniques in providing control over the quality of service that(More)
—iWARP represents the leading edge of high performance Ethernet technologies. By utilizing an asynchronous communication model, iWARP brings the advantages of OS bypass and RDMA technology to Ethernet. The current specification of iWARP is only defined over connection-oriented transports such as TCP. The memory requirements of many connections along with(More)
The performance of the emerging commercial chip multi-threaded multiprocessors is of great importance to the high performance computing community. However, the growing power consumption of such systems is of increasing concern, and techniques that could be effectively used to increase overall system power efficiency while sustaining performance are very(More)
Offload. As such high performance socket networks are likely to be deployed or converged with existing Ethernet networking solutions, the performance of such technologies is important to assess. In this paper we take a first look at the performance advantages provided by these offload techniques and compare them to SDP. Our micro-benchmarks and enterprise(More)