Multiprocessor systems are well suited to ray tracing, since each ray can be traced independently. However, the large databases required to model complex scenes create problems of data access. In this paper we propose a multiprocessor architecture for ray tracing which removes the need for duplication of the database at processor level. The database is held on a group processor basis, and resid...

The availability of multiprocessing workstations offers the opportunity to simultaneously apply both sharedand distributed-memory parallel processing techniques to a single application. It has been assumed that using the datasharing formalisms native to the specific machine would yield performance superior to those obtained with a more general message-passing system. We compared the performance...

The primary goal for an operating system in a symmetric multiprocessing (SMP) implementation is to convert the additional computing power provided to the system, as processors are added, into improved system performance without compromising system quality. The DEC OSF/1 version 3.0 operating system uses a number of techniques to achieve this goal. The techniques include algorithmic enhancements...

A model of a multiprocessing, multiprogramming computer system with serially reusable programs was developed to study the effect of serial programs on system performance. Two strategies for implementing serially reusable programs were investigated, a wait strategy in which the processor waits until the serial program is available, and a switch strategy, in which the processor is freed to do oth...

Very little use is made of multiple processors available on current supercomputers (computers with a theoretical peak performance capability equal to 100 MFLOPS or more) in computational aerodynamics to significantly improve turnaround time. The productivity of a computer user is directly related to this turnaround time. In a timesharing environment, the improvement in this speed is achieved wh...

Automated Mapping for Heterogeneous Multiprocessor Embedded Systems

In this paper we explore a time-predictable chip-multiprocessor (CMP) system based on single-path programming. To keep the timing constant, even in the case of shared memory access for the CMP cores, the tasks on the cores are synchronized with the time-sliced memory arbitration unit. 1 The Single-Path CMP System The main goal of our approach is to build an architecture that provides a combinat...

Consciousness, as a complex phenomenon, arises on a hierarchy of human rhythms and their interaction with environment. We present here a model of consciousness represented as a parallel distributed multiprocessing system with rhythmic scanning within a set of active modules. Dominant "gestalt" activity is then created by global exchange of information on "system bus" and by means of common elec...

We address the multicore problem for interactive theorem proving, notably for Isabelle. The stagnation of CPU clock frequency since 2005 means that hardware manufactures multiply cores to keep up with “Moore’s Law”, but this imposes the burden of explicit parallelism to application developers. To cope with this trend, Isabelle has started to support parallel theory and proof processing in 2007,...

Simultaneous Multithreading (SMT) has become common in commercially available processors with hardware support for dual contexts of execution. However, performance of SMT systems has been disappointing for many applications. Consequently, many SMT systems are operated in a single-context configuration to achieve better average throughput, depending on the application domain. This paper first ex...