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For matrix operations, the algorithm-based fault tolerance (ABFT) brings much lower fault tolerance overhead than the traditional Triple Modular Redundancy or Double Modular Redundancy approaches. Many works have been done to develop and optimize ABFT schemes on general purpose microprocessors. However, the ABFT schemes on heterogeneous systems with GPUs are not fully developed and optimized. Moreover,...
Three-level page-mapping FTL scheme utilizes the characteristics of SSD hardware system, divides a plane into several parts called block-group. A block-group has a fixed number of physical blocks. In this scheme, a series of logical pages are stored in a block-group. Inside the block-group, the mapping relationship between logical page and physical page is fully associative. This scheme decreases...
We consider rechargeable wireless sensor networks that experience intermittent connectivity due to power outages caused by insufficient energy harvesting and limited storage. We present a predictive retransmission strategy that is integrated with opportunistic routing and unicast routing with cooperative relaying to reduce the transmission delay in such networks. Simulation results are presented to...
Apache Hadoop is a widely used distributed computing framework and its file system is Hadoop Distributed File System (HDFS), which assumes that DataNodes in a system are homogeneous in nature. When a cloud system scales up, DataNodes are very likely to become heterogeneous. Thus, extensive research has been placed on improving performance for heterogeneous Hadoop systems, but little attention has...
Software-Defined Networking (SDN) introduces a centralized control logic and separated data plane from the control plane. Controller is the brain of a SDN network. Hence, the SDN make it easier for network engineers to monitor traffic and diagnose threats, insert and change security policies. However, it also creates security challenges which didn't exist before. In this paper, we first describe layers...
Modern storage software is designed to guarantee data integrity and consistency based on decades of experience with the foibles of hard disk drives. However, recent research shows that flash-based SSDs may fail in different and surprising ways, breaking their contract with the software above them. This raises the question of whether the software stack's guarantees to users still hold when SSDs are...
Abstract-Dynamic optimization techniques such as dynamic voltage and frequency scaling (DVFS), power gating (PG) and thread migration are widely used in current multi-core processor platforms to boost performance, lower power and improve energy efficiency. To obtain the best optimization results, an important issue is to predict the performance of each thread quantitatively. In this paper, a separated...
PNNL's Center for Advanced Technology Evaluation (CENATE) is a new U.S. Department of Energy center whose mission is to assess and facilitate access to emerging computing technology. CENATE is assessing a range of advanced technologies, from evolutionary to disruptive. Technologies of interest include the processor socket (homogeneous and accelerated systems), memories (dynamic, static, memory cubes),...
Very large data sets within the range of megabytes to terabytes generated daily from checkpoint-and- restart processes are seen in today's scientific simulations. Reliability and durability are two important factors to build an archive storage system. Erasure code based object storage systems are becoming popular choices for archive storage systems due to cost-effective storage space saving schemes...
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