definition of distributed operating system
An Introduction to Intelligent and Autonomous Control-Chapter 5: Modeling and Design of Distributed Intelligence Systems
Ngày tải lên: 07/11/2013, 09:15
The Duality of Memory and Communication in the Implementation of a Multiprocessor Operating System
... Principles of Distributed Computing. 1986. [15] Rashid, R.F. and Robertson, G. Accent: A Communication Oriented Network Operating System Kernel. In Proceedings of the 8th Symposium on Operating System ... last 20 years operating systems and their environments have undergone dramatic expansion in size, scope and complexity. The Alto operating system [22], a workstation operating system of the early ... the organization of distributed and parallel applications, but in the implementation of the operating system kernel itself. Mach uses memory-mapping techniques to make the passing of large messages...
Ngày tải lên: 12/09/2012, 15:05
Principles of Distributed Systems pot
... a single point of attack. (2) The amount of information to store grows exponentially with the size of the system and centralized systems cannot sustain storing a growing amount of data at a user ... Model We consider a system of m identical cores with a finite set of shared data items {i 1 , ,i s }. The system has to execute a workload, which is a finite partially-ordered set of transactions Γ ... complexity is given by the computational requirement of the solution of a linear system composed of O(MN R max ) equations, which is orders of magnitude worse than our approach. 4 Bounding Analysis Even...
Ngày tải lên: 22/03/2014, 09:20
Báo cáo hóa học: "Second-order statistics of selection macrodiversity system operating over Gamma shadowed -μ fading channels" pot
... the characteristics of the fadingsignalintermsofmeasur- able physical parameters [2]. Let us consider macro-diversity system of SC type which consists of two micro-diversity systems with switching ... information of the received signal, and separate receiver chain for each branch of the diversity system, which increases the complexity of the system. In [2,10], it is shown that the sum of -μ powers ... with higher number of diversity branches, higher values of fading severity and higher values of shadowing severity, better performances of system are achieved (lower values of AFD). 5 Conclusion In...
Ngày tải lên: 20/06/2014, 22:20
Báo cáo hóa học: " Research Article On Sum Rate and Power Consumption of Multi-User Distributed Antenna System with Circular " pdf
... the capacity of CDMA system with distributed antennas. Since distributed antennas are relatively cheap, it is feasible to de- ploy a large number of antennas, which makes application of random matrix ... (22) Proof. See appendix. To characterize power consumption of a CL-DAS, we in- vestigate the asymptotic behavior of E in (13) when there are a large number of antenna and users. By the strong law of large ... or sum rate. The channel capacity of a single-user DAS and the sum rate of a multi-user DAS were investigated and compared with those of co-located antenna systems (CAS) using Monte Carlo simulation...
Ngày tải lên: 22/06/2014, 19:20
Formal Models of Operating System Kernels phần 10 pot
... been pointed out (in Chapter 1) that file systems are not considered part of the kernel. File systems are certainly part of the operating system but not part of the kernel. They are considered privileged ... systems—consider diskless nodes in distributed systems and, of course, real-time systems, and there have been a number of attempts to replace file systems with databases; Mach, famously, relegates the file system to a ... advent of multicore processor chips. It is natural, then, also to consider distributed operating systems from a formal viewpoint, at kernel and higher levels. Within the area of distributed systems, there...
Ngày tải lên: 23/07/2014, 23:20
Formal Models of Operating System Kernels phần 9 potx
... N pgallocstart =0 The value of 0 is completely arbitrary, as is now explained. Some systems map a virtual copy of the operating system onto the vir- tual address space of each user space (and some ... determine a number of properties of CCS and CSP processes, including observational equivalence and bisimilarity. The propositions concerning equivalence of the various versions of the subsystem were ... between the component processes of the subsystem, not in the specification of the components. The processes to be modelled do not have properties suggestive of the use of the π-calculus (e.g., mobility),...
Ngày tải lên: 23/07/2014, 23:20
Formal Models of Operating System Kernels phần 8 pot
... comprising the system- call library all send and receive messages. Therefore, the rest of the proof must be in terms of the properties of the message-passing subsystem. The message-passing subsystem is ... of sharedpages(p)(sg), for some p and sg. Proof. Similar to the previous proof. ✷ Proposition 134. IsLockedPage iff lpno? is a locked page; that is, iff lpno? is an element of lockedpages. Proof. ... being “in core”, hence the name of the variable, incore.Thepagecount counts the number of pages in each segment of each process. There is an a priori limit to the number of pages in a segment and pagecount...
Ngày tải lên: 23/07/2014, 23:20