Multithreaded Computer Architecture: A Summary of the State of the ART

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The M-Sim tool set is a detailed timing simulator that supports non-blocking caches, speculative execution, and state-of-the-art branch prediction. In addition to its core simulator, the M-Sim package contains statistical analysis resources, and debug and verification infrastructure, using the DLite debugger. What is available in the M-Sim toolset?

The tool set consists of a single microarchitecture simulator that emulates superscalar microprocessors at different levels of detail. It supports the more complicated out-of-order execution mode, and includes branch prediction, caches, and external memory. M-Sim implements SMT by sharing some processor structures between threads and leaving other structures private to each thread.

M-Sim only supports independent processes with private memory spaces dependent threads are left to future work.

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For more information see [4]. Highly dynamic programming environments for embedded real-time systems require a strict isolation of real-time threads from each other to achieve dependable systems. We propose a new real-time scheduling technique, called guar- anteed We propose a new real-time scheduling technique, called guar- anteed percentage GP scheme that assigns each thread a specific percentage of the processor power.


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A hardware scheduler in conjunction with a multithreaded processor guarantees the execution of instructions. ABSTRACT In this paper we present a control theory approach to stabilize the throughput of threads for real-time applications on a multithreaded processor.

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Multithreading (computer architecture) - Wikipedia

We use a statistical model of a super scalar, multi-threaded processor as transfer We use a statistical model of a super scalar, multi-threaded processor as transfer function to calculate the resulting IPC rate. Our control theory approach is not limited to a specific processor and can be adapted to different microprocessor architectures. We are able to guarantee a minimum IPC rate within a defined convergence interval.

Furthermore our results provide a method to improve WCET analysis, because inaccuracies of the processor model are soften by the use of our control theory approach.

Multi Threading Performance - Georgia Tech - HPCA: Part 5

This paper presents a real-time Java hardware and soft- ware system for use in embedded applications. The microcontroller core is designed with a multithreaded pipeline and hardware sup- port for real-time scheduling algorithms.

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The Java Virtual Machine consists of trap. We describe an approach to control an autonomous guided We describe an approach to control an autonomous guided vehicle AGV by the Komodo microcontroller, a multi-threaded Java microcontroller. The main challenge is that the microcontroller has to meet hard real-time constraints to ensure a faultless drive.

Then we show that we are also able to run the AGV using a real-time middleware and we measure the overhead in time and memory introduced by the middleware. ABSTRACT Our aim is to investigate if it is possible to control and to stabilize the throughput IPC rate of a thread running on a multithreaded Java processor by a closed feedback loop and a model based latency predictor.

We implemented We implemented a PID controller and a model based latency predictor in the processor simulator of the Komodo microcontroller developed at the universities of Karlsruhe and Augsburg to simulate both as additional hardware modules. GP guaranteed percentage scheduling is used to control the thread.

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Evaluations show that the aimed IPC rate of a thread is achieved by the controller and stabilized by the latency predictor thus improving the real-time capabilities of the Java processor. Design and evaluation of an adaptive real-time microprocessor. Abstract TinyOS is the current state of the art in operating systems for sensor network research. Event-based programming model of TinyOS presents concept of Task to allow postponing processing.

For little processing and memory overhead For little processing and memory overhead and to avoid race A high performance message-passing system for network of workstations.

Simulation evaluation of hybrid srpt scheduling policies. All these operations are part of the TFlux run-time system, which includes all data The experiments and our reported experience indicates that, from the runtime integration point of Assessing improvements to the parallel volume rendering pipeline at large scale. As scientists generate terabyte and petabyte data, it is insufficient As scientists generate terabyte and petabyte data, it is insufficient to measure the performance of visual analysis algorithms by rendering speed only, because performance is dominated by data movement.

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Implicit vs. In a Simultaneous Multithreaded SMT architecture, the front end of a superscalar is adapted in order to be able to fetch from several threads while the back end is shared among the threads.

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In this paper, we describe different resource In this paper, we describe different resource sharing models in SMT processors. Different applications may exhibit radically different be-haviors and thus have very different requirements in terms of hardware support.