1,720,957 research outputs found
Adios to Busy-Waiting for Microsecond-scale Memory Disaggregation
Get PDFHow fast and efficiently page faults are handled determines the performance of paging-based memory disaggregation (MD) systems. Recent MD systems employ busy-waiting in page fault handling to avoid costly interrupt handling and context switching. Upon a page fault, they issue a remote fetch request and busy-wait for the completion of the request rather than yield their execution to other tasks. While these attempts succeed to cut the latency of MD systems to microseconds, they suffer from head-of-line (HOL) blocking that leads to high tail latency and causes RDMA network underutilization. To address the problems, we reload the yield-based mechanism into the page fault handling and propose a new MD system, Adios. While yielding involves the switching overhead, Adios minimizes it by putting the page fault handler and the execution scheduler into a single address space. Then we use newly designed lightweight user-level threads, namely unithread. We also devise a dispatching algorithm that alleviates the imbalance in RDMA queue pairs, assuring lessened queueing delays and improved RDMA network utilization. Our evaluation demonstrates that Adios outperforms an existing state-of-the-art busy-waiting MD system, DiLOS, by up to 1.07-1.64× in throughput and 1.99-10.89× in P99.9 latency on real-world applications
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
분해 데이터 센터를 위한 메모리 관리 레이어에 관한 연구
No full text학위논문(석사) - 한국과학기술원 : 전산학부, 2019.8,[iv, 33 p. :]The popularity of memory-intensive applications has increased the demand for various systems running them. Existing solutions, such as swapping and memory over-provisioning, fail to support the memory-intensive application. Disk swapping significantly reduces performance of the memory-intensive application due to too frequent evictions. On the other hand, memory over-provisioning incurs low memory utilization which results in high memory cost. Disaggregated data center is proposed to mitigate these limitations. It uses a fast and efficient inter-connection such as RDMA to allocate resources from the remote pool on demand. Prior work suggests disaggregated data center libraries both in userspace and in form of kernel block device driver. Userspace libraries incur additional cost for integrations due to library-specific APIs, whereas kernel block device drivers are not able to exploit user application's information. In this work, We propose a userspace memory management library that mitigates these limitations. It enables each process to use remote memory as same as a local one. Unlike similar resource disaggregation libraries, it offers a POSIX-like API for easy integration. In addition, since the library shares its address space with the user application, it is possible to exchange information between the library and application easily. This introduces additional optimization opportunities. To verify the effectiveness of the proposed library, we implemented its prototype. For basic performance comparisons, we conduct a microbenchmark. It shows that our implementation brings better performance compared to Linux's disk swapping. Finally, we integrate Memcached, which is a well-known memory-intensive application, with our solution and analyze its performance to evaluate the ease of integration and performance benefits when it comes to the real-world application. The integration only takes only 10 lines of code modification, while it presents higher throughput (TPS) than Linux's disk one.한국과학기술원 :전산학부
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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