Performance Portability Through Semi-explicit Placement in Distributed Erlang

We consider the problem of adapting distributed Erlang applications to large or heterogeneous architectures to achieve good performance in a portable way. In many architectures, and especially large architectures, the communication latency between pairs of virtual machines (nodes) is no longer uniform. We propose two language-level methods that enable programs to automatically adapt to heterogeneity and non-uniform communication latencies, and both provide information enabling a program to identify an appropriate node when spawning a process. We provide a means of recording node attributes describing the hardware and software capabilities of nodes, and mechanisms that allow an application to examine the attributes of remote nodes. We provide an abstraction of communication distances that enables an application to select nodes to facilitate efficient communication. We have developed open source libraries that implement these ideas. We show that the use of attributes for node selection can lead to significant performance improvements if different components of the application have different processing requirements. We report a detailed empirical investigation of non-uniform communication times in several representative architectures, and show that our abstract model provides a good description of the hierarchy of communication times

Symbolic and analytic techniques for resource analysis of Java bytecode

Recent work in resource analysis has translated the idea of amortised resource analysis to imperative languages using a program logic that allows mixing of assertions about heap shapes, in the tradition of separation logic, and assertions about consumable resources. Separately, polyhedral methods have been used to calculate bounds on numbers of iterations in loop-based programs. We are attempting to combine these ideas to deal with Java programs involving both data structures and loops, focusing on the bytecode level rather than on source code

Diseño institucional y política pública: una perspectiva microeconómica

This survey article provides a microeconomic perspective of institutional design and public policy, focusing on the way the relations between voters, politicians and bureaucrats produce efficients outcomes in public policy. It points out the relevance of information and monitoring costs, competition and the structural features of institutions in the search of efficient results, and the way social scientists explain the failures of the political and burocratic markets.institucional design, public policy, information costs, political markets, bureaucracy, public choice

Observations on the non-starchy barley polysaccharides

1. Methods have been developed whereby an extract of barley containing the non-starchy water soluble polysaccharides may be fractionated. The most successful fractionating agent used was ammonium sulphate.2. At least two distinct polysaccharides have been isolated. One, a pure glucosan which possesses a small negative specific rotation and may be likened to a short chain cellulose; two, a pentosan which gives arabinose and xylose on hydrolysis and which is suspected to be a mixed polysaccharide.3 The precise source of the water soluble non- starchy polysaccharides remains undetermined. The husk and embryo would appear to be deficient in these materials and the most probable location seems to be some part of the endosperm.4. The nature of action cf the cell-wall hydrolysing enzyme systems of barley has been examined. The results obtained confirm previous work which postulated two enzyme systems - one, which had a disaggregating action, and the second which had a saccharifying action. Such data as is available indicate that the precise nature of the combined action of the two systems is more complex than at first suspected

Character description and socio-political apologetic in the Acts of the Apostles

Acts has been the subject of exhaustive enquiry from historical, source, redactional, literary, and other angles. The aim of this thesis is to read Acts as would someone with an education typical of that time. The clearer it is that such rhetorical grounding was sufficient basis for an intelligible interpretation, the more likely that Acts was extroverted enough to be addressed to a general readership. Since it was the practice to interpret history in terms of individuals not general movements, as is exemplified in theoretical statements of Cicero and Seneca and in the practice of Thucydidas, Sallust, Livy and Tacitus, the school exercise of character description forms the basis of analysis and interpretation, as illustrated from 14.8-19.By use of the theory of Theon and suitable practical examples in Homer, Sailust, Dosephus, etc., the typical form of the character sketch is outlined, as are common topics in it as used in Acts, thus identifying the examples in Acts. With reference to such as Seneca, Tacitus, Vergil and Polybius, it is shown how this exercise was used in historiography to introduce minor, and offer obituaries of major, characters, and so it emerges that in Acts these sketches introduce the Church, and that Paul, receiving valedictory description, is the dominant figure. Reference to historiographers also identifies the use of descriptions as digressions which yet advance the inquiry, 18.24-28 proving to be such a typifying digression. Adding Theon's exercise of comparison, and again with reference to Plutarch, Xenophon, Catullus, etc., 4.32-5.11 and 8.4-40 (Lucian affording a significant comparison) are shown to be like digressions. 21.37-9 and 22.25-8 are also comparisons, but 9.32-10.48 is a climactic grouping of characters. Menander's On Ecideictic provides the theoretical basis for the interpretation of character sketches in travel rhetoric, and Lucan a practical instance. Situations of arrival and departure occur at 15.6—16 and 20.36—21.16. For 21.39—26.39, the theory of Cicero's De Inuantione and the Rhetorica ad Herannium on dicanic oratory form the basis for discussion of the defence speech and its effect on characterisations within it. The themes which emerge are reviewed under the following heads: opposition and advance; resurrection; piety; a dialectical relationship with the Dews; connection with the higher echelons of society; lack of secretiveness; invitation to something with a certain mystique; innocence and justice.Brief remarks on what Acts may have to say to the contemporary West conclude the exploration of what it said in its own time

Alien Registration- Mackenzie, Kenneth J. (Portland, Cumberland County)

https://digitalmaine.com/alien_docs/22162/thumbnail.jp