Continuous Data Protection (CDP) is a recent storage technology which enables reverting the state of the storage to previous points in time. We propose four alternative architectures for supporting CDP in a storage controller, and compare them analytically with respect to both write performance and space usage overheads. We describe exactly how factors such as the degree of protection granulari...

Protecting data on primary storage often requires creating secondary copies by periodically replicating the data to external target systems. We analyze over 100,000 traces from 125 customer block-based primary storage systems to gain a high-level understanding of I/O characteristics and then perform an in-depth analysis of over 500 traces from 13 systems that span at least 24 hours. Our analysi...

This paper presents techniques to integrate the use of variable latency units in a high-level synthesis design methodology. Components used as building blocks (e.g., functional units) in conventional high-level synthesis techniques are assumed to have fixed latency values. Variable latency units exhibit the property that the number of cycles taken to compute their outputs varies depending on th...

Secret sharing schemes with optimal and universal communication overheads have been obtained independently by Bitar et al. and Huang et al. However, their constructions require a finite field of size q > n, where n is the number of shares, and do not provide strong security. In this work, we give a general framework to construct communication efficient secret sharing schemes based on sequences ...

—Differential Power Analysis (DPA) side-channel attacks pose serious threats for embedded system security. WDDL was proposed as a countermeasure that can be incorporated into a conventional ASIC design flow using standard cells. However, our spice simulations show that DPA attacks on WDDL still leak secret keys to adversaries despite the doubled area and energy overheads due to the use of compl...

Object oriented application libraries targeted to a specific application domain are an attractive means of reducing the software development time for sophisticated high performance applications. However, libraries can have the drawback of high abstraction penalties. We describe a domain specific, source-to-source translator that eliminates abstraction penalties in an array class library used to...

Although event tracing of parallel applications offers highly detailed performance information, tracing on current leading edge systems may lead to unacceptable perturbation of the target program and unmanageably large trace files. High end systems of the near future promise even greater scalability challenges. In this work we identify and quantify the overheads of application tracing. We repor...