This paper is a preliminary report on a system which has not yet been implemented. Of necessity, it therefore reports on status and objectives rather than on performance. We are impelled to produce such a prospectus b...
详细信息
This thesis describes the detailed design of a distributed operating system for a real-time, microcomputer based multiprocessor system. Process structuring and segmented address spaces comprise the central concepts ar...
详细信息
This thesis describes the detailed design of a distributed operating system for a real-time, microcomputer based multiprocessor system. Process structuring and segmented address spaces comprise the central concepts around which this system is built. The system particularly supports applications where processing is partitioned into a set of multiple processes. One such area is that of digital signal processing for which this system has been specifically developed. The operating system is hierarchically structured to logically distribute its functions in each process. This and loop-free properties of the design allow for the physical distribution of system code and data amongst the microcomputers. In a multiprocessor configuration, this physical distribution minimized system bus contention and lays the foundation for dynamic reconfiguration.
There appears to be an increasing trend to the use of more systematic procedures in personnel selection. In this paper, a fuzzy multiple objective programming approach for personnel selection is presented. The propose...
详细信息
There appears to be an increasing trend to the use of more systematic procedures in personnel selection. In this paper, a fuzzy multiple objective programming approach for personnel selection is presented. The proposed method integrates the decision-maker's linguistic assessments about subjective factors such as excellence in oral communication skills, personality, leadership, and quantitative factors such as aptitude test score within the multiple objective programming framework. The importance degree of each objective is considered by applying the composition operator to the objective's membership function and the membership function corresponding to its fuzzy priority defined by linguistic variables. The decision approach presented in this paper is promising for a structured evaluation of the short-listed candidates.
Because of the rapid increase in the use of multiprogramming, multiprocessing, interactive displays, remote terminals and on-line communications in time-sharing and real time commercial and fixed military systems, it ...
详细信息
The designer of a computing system should adopt explicit criteria for accepting or rejecting proposed system features. Three possible criteria of this kind are input recordability, input speciflability, and asychronou...
详细信息
A methodology is developed for determining how much parallelism is optimal if a given job stream is to be executed without multiprogramming. Qualitative design tradeoffs are inferred from the cost-performance effect o...
详细信息
On systems with multi-core processors, the memory access scheduling scheme plays an important role not only in utilizing the limited memory bandwidth but also in balancing the program execution on all cores. In this s...
详细信息
Xab is a run time monitoring tool for parallel virtual machine (PVM) programs. Xab gives the user direct feedback as to what PVM functions his or her program is performing. In its most simple form, this feedback is di...
详细信息
The simulated evaluation of memory management policies relies on reference traces - logs of memory operations performed by running processes. No existing approach to reference trace collection is applicable to a compl...
详细信息
ISBN:
(纸本)1581136730
The simulated evaluation of memory management policies relies on reference traces - logs of memory operations performed by running processes. No existing approach to reference trace collection is applicable to a complete system, including the kernel and all processes. Specifically, none gather sufficient information for simulating the virtual memory management, the filesystem cache management, and the scheduling of a multiprogrammed, multithreaded workload. Existing trace collectors are also difficult to maintain and to port, making them partially or wholly unusable on many modern systems. We present Laplace, a trace collector that can log every memory reference that a system performs. Laplace is implemented through modifications to a simulated processor and an operating system kernel. Because it collects references at the simulated CPU layer, Laplace produces traces that are complete and minimally distorted. Its modified kernel also logs selected events that a post-processor uses to associate every virtual memory and filesystem reference with its thread. It also uses this information to reconcile all uses of shared memory, which is a task that is more complex than previously believed. Laplace is capable of tracing a workload without modifications to any source, library, or executable file. Finally, Laplace is relatively easy to maintain and port to different architectures and kernels.
Background: In effort estimation model construction, it seems effective to window training project data so that only recently finished projects are used. This is because old projects might be less representative of an...
详细信息
暂无评论