Learn More
To meet the demand for more powerful high-performance shared-memory servers, multiprocessor systems must incorporate efficient and scalable cache coherence protocols, such as those based on directory caches. However, the limited directory cache size of the increasingly larger systems may cause frequent evictions of directory entries and, consequently,(More)
Most standard cluster interconnect technologies are flexible with respect to network topology. This has spawned a substantial amount of research on topology-agnostic routing algorithms, which make no assumption about the network structure, thus providing the flexibility needed to route on irregular networks. Actually, such an irregularity should be often(More)
Most commercial routers designed for networks of workstations (NOWs) implement wormhole switching. However, wormhole switching is not well suited for NOWs. The long wires required in this environment lead to large buffers to prevent buffer overflow during flow control signaling. Moreover, wire length is limited by buffer size. Virtual cut-through (VCT)(More)
In this paper we present a methodology to design fault-tolerant routing algorithms for regular direct interconnection networks. It supports fully adaptive routing, does not degrade performance in the absence of faults, and supports a reasonably large number of faults without significantly degrading performance. The methodology is mainly based on the(More)
Networks of workstations (NOWs) are being considered as a cost-effective alternative to parallel computers. Most NOWs are arranged as a switch-based network and provide mechanisms for discovering the network topology. Hence, they provide support for both regular and irregular topologies, which makes routing and deadlock avoidance quite complicated. Current(More)
Congestion management is a very critical problem tackled in interconnection networks for years but not solved yet. Although several mechanisms have been recently proposed for lossless multistage interconnection networks (MINs), they either have drawbacks or are partial solutions. Some of them introduce penalty over packets not really addressed to the(More)
BACKGROUND Human papillomavirus (HPV) is the main cause of cervical cancer. The development of non-invasive self-sample collection methods would have the potential advantage of increasing the acceptance of the screening procedures. OBJECTIVES To compare human papillomavirus (HPV) DNA detection and genotyping with the Cobas 4800 HPV test (Roche Diagnostic,(More)
CONTEXT Hispanic Americans have a substantial need for organ transplants and are underrepresented among organ donors, yet little is known about predictors of organ donation outcomes in this population. OBJECTIVE To assess factors that may function as significant predictors of organ donation behavior among Hispanic Americans. DESIGN A random-digit-dial(More)