Trace sampling for reducing the cost of simulation trace sampling has been used in the last two decades to reduce the cost of storage and execution time of the tracedriven simulation. In a tracedriven simulation whenever a value for a random variable is needed by the simulation, it is read from a data file. Traceability data in modeldriven software development mdsd sv06 can be understood as the runtime footprint of model transformation execution ch06. Core concepts within modeldriven development mdd there are two core concepts associated with modeldriven development. It also details the conditions required for the development of a discovery driven team and an execution driven team. Timedriven simulation working with individual samples one of the main features of optisystem is the mixed signal representation. Essentially, trace links provide this kind of information by associating source and target model elements with respect to the execution of a certain model transformation. Smith gives examples of trace driven memorysystem studies that date as far back as 1966 smith82, and several surveys of trace driven techniques have been written since then holliday91. In computer science, a computer architecture simulator, or an architectural simulator, is a piece of software to model computer devices or components to predict outputs and performance metrics on a given input. This solution of 234 words discusses the difference between a discovery driven team and an execution driven team using examples and case scenarios. The twophase structure of the eventdriven simulation algorithm imposes a time scale on the simulation. Tracedriven simulation derives the model input from a sequence of observations made on a real system mr09. In a trace driven simulation whenever a value for a random variable is needed by the simulation, it is read from a data file.
Types trace driven vs event driven trace driven process. In this paper, we describe a new executiondrivensimulation tool to evaluateinterconnection networks for distributed memory multiprocessors using real application. To find issues in the execution a limited trace buffer might be sufficient, but streaming trace allows a complete analysis of the system to be used for code coverage and profiling analysis. In case of simulations, before it was ready to be installed, many test runs are done to check its robustness. Data driven programming is a programming model where the data itself controls the flow of the program not the program logic where in case of event driven programming, it is the event not the data itself controls the. Trace driven simulation has been used to evaluate memory systems for decades. Thus, executiondriven simulation allows feedback fromthe hardware simulator to the software. When program is run, dynamic trace execution is created.
It also details the conditions required for the development of a discovery driven team and an. Executiondrivensimulatorsforparallelsystemsdesign anandsivasubramaniam departmentofcomputerscienceandengineering thepennsylvaniastateuniversity. In computer science, tracebased simulation refers to system simulation performed by looking at traces of program execution or system component access with the purpose of performance prediction tracebased simulation may be used in a variety of applications, from the analysis of solid state disks to the message passing performance on very large computer clusters. The jtrace pro streaming trace capability technically enables instruction tracing of the whole system execution from the startup to its current point. However, trace driven simulators are not good in modelling multithreaded workloads as they cannot model the interaction between multiple threads. Jul 30, 20 as an example, analyticsdriven can be demonstrated as the difference between using the collected data of a consumer sale type of products, transaction amount, etc. A real machine is used to execute a benchmark programsoftware in the native isa.
Simplescalar austin, larsen, ernst 2002 similar to tracedriven simulation except program under study and simulation are interleaved produce and consume event stream in interleaved fashion key advantages over tracedriven simulation avoids specialized hardware for collecting. The traces of the user reads and writes over time periods of a month or more are ingested by the simulator and used as the workload for the simulated system. Microarchitecture simulation is an important technique in computer architecture research and. Trace driven simulation is getting the actual data from a real experiment and feeding it to the simulation. Intermediate outputs can be output after each execution of this routine.
Modeldriven development mdd has emerged as one of the leading approaches for enabling rapid, collaborative application development. Trace driven simulation is also used in the design of network routers and packet switches. Executiondrivensimulation can yield moreaccurate results than tracedriven simulation. Specifically, the input can be a trace collected from an execution of program on. A trace driven simulator takes program instructions and address traces and supplies. It reduces the software engineering effort for building and debugging new tools for trace analysis. When a new request arrives in the simulator, it checks the contents of the cache to see whether the corresponding. Instruction set architecture isa emulators such as armulator 2 and simplescalar 3 can perform execution driven cache simulation with a high. Tracedriven simulation is a popular technique that enables fast design evaluation by considering system models where inputs are derived from a reference system execution, referred to as traces.
Replays of production load can be an alternative to explicit modeling of job. Trace sampling for reducing the cost of simulation trace sampling has been used in the last two decades to reduce the cost of storage and execution time of the trace driven simulation. Each execution of the event processor subroutine defines one unit of simulated time. Simcad pro simulation software, modeling, optimization, and predictive analytics with lean and six sigma metrics, create a digital twin of your operation. Eventdriven tracedriven process pregenerated traces to determine cycle count for trace trace generation software instrumentation special instructions inserted into program. Business process simulation software simcad simulation. Executiondriven simulation can be performed at various levels of abstraction, from the algorithmic level to the bitaccurate and cycleaccurate rtl 1. Application of the trace driven process on a software radio. Time driven simulation is synchronous in the sense that all the system activities occur at discrete time intervals which are processor cycles. For a good overview of simulation modeling, see 2 and its references. The twophase structure of the event driven simulation algorithm imposes a time scale on the simulation.
Time driven simulation in a time driven simulation we have a variable recording the current time, which is incremented in fixed steps. Trace driven simulation is a popular technique that enables fast design evaluation by considering system models where inputs are derived from a reference system execution, referred to as traces. Trace driven modeling proceedings of the 1st symposium. Hardware instrumentation monitor system bus via hardware. Mass storage system performance prediction using a trace. The disadvantage is every time the experiment has to be done which is a tedious. The software application model is defined on a higher abstraction level and then converted into a working application using automated transformation or interpretations. Simulators and such outline what defines a simulator. An execution driven interconnection network simulator. They require the user to store the trace files which can grow really large. While a tracedriven simulation is known to be comparatively fast and its. Execution drivensimulatorsforparallelsystemsdesign anandsivasubramaniam departmentofcomputerscienceandengineering thepennsylvaniastateuniversity. Demand driven material requirements planning ddmrp is not a silver bullet. A simulator is a software performance model of a processor architecture which.
Computer architectural simulation techniques nitish. Microarchitecture simulation can be classified into multiple categories according to input types and level of details. In our carwash example, the trace might be a file of the intervals between successive car arrivals recorded while watching the system. We then present three case studies that illustrate how midas can be used to study architectural design tradeoffs in active. Much smaller instruction traces can be generated to represent the full continuous trace with much lower costs 6. Software test integration on functional behaviours platform modeling software components. Tracesevents are prerecorded streams of instructions with some fixed input. Simulation seeks to emulate the execution of a particular workload,v, in a particular environment, 7, the fargef environment. Although trace driven simulators are simpler and faster than execution driven simulators because they do not model data transformations, trace driven simulators must be fed from a trace that comes from an execution driven simulator or an. Since all tools share a common infrastructure for trace gathering and retrieving, tool writers can focus on their analysis engines instead. As an example, analyticsdriven can be demonstrated as the difference between using the collected data of a consumer sale type of products, transaction amount, etc. Application of the trace driven process on a software radio casestudy. A comparison of three computer system simulators diva portal.
Fast and accurate microarchitectural simulation of. Other systems requiring resimulation of a trace must do it on the same machine e. We have developed a simulator which models the behavior of a cache manager for a web server. Consequently, we focus on software based simulation. Trace driven simulation derives the model input from a sequence of observations made on a real system mr09. In an executiondriven simulation, the execution of a software is interleaved with the simulation of the underlying hardware. By studying available literature in the area of lean and simulation driven product development the consistence of the two product development philosophies are rather high. Tracedriven vs executiondriven simulators traces are prerecorded streams of instructions, which allows for a deterministic simulation each time executiondriven simulations allows exploration of speculative execution and also sideeffects of the operating system 10 simplescalar a microarchitectural simulator suite t. A tracedriven approach for fast and accurate simulation of. A variety of softwarebased tools have been made available for obtaining traces on. A gem5 tracedriven simulator for fast architecture. Traceability in emerging forms of software engineering. Trace driven simulation simulator reads a trace of instructions captured during a previous execution both functional and timing simulator can be built trace simulator cs2410.
Computer architectural simulation techniques nitish srivastava. Automatic generation of trace links in modeldriven. Tracedriven simulation simulator reads a trace of instructions captured during a previous execution both functional and timing simulator can be built trace simulator cs2410. However, when the nal design choices must be done a more precise evaluation study should be performed. November 6 event driven simulation if events arent guaranteed to occur at regular intervals, and we dont have a good bound on the time step it shouldnt be so small as to make the simulation run too long, nor so large as to make the number of events unmanageable, then its more appropriate to use an event driven simulation. School of engineering, department of systems and software engineering. Framework for instructionlevel tracing and analysis of. Instruction traces contain the actual instructions executed during a snapshot.
Timedriven simulation is synchronous in the sense that all the system activities occur at discrete time intervals which are processor cycles. We focus on executiondriven, timing simulators, which are the preeminent tool for evaluation of future. Computer architecture university of pittsburgh executiondriven simulation simulator runs the program, generating. Software components modeling software allocation on hardware, nf constraintsand hwcapabilities parametersannotation test trace functional verification nonfunctional verification formal modeling of properties platform design hardware specification integrationfromreal platformexecution timing comparison execution vs simulation business code. Because modeldriven development uses visual modeling techniques to define data relationships, process logic, and build user interfaces, modeldriven software development empowers both developers and business users to rapidly deliver. Tracedriven modeling is a technique whereby a recorded trace of system activities is directly used to define the environment and workload for a model of a computer system. We focus on execution driven, timing simulators, which are the preeminent tool for evaluation of future. Explosive destruction system munitions destruction. Motivation, tools, challenges and prospects javad zarrina, rui l. We describe the design of midas, providing details about the various simulation models and how they interact. After each increment we check to see which events may happen at the current time point, and handle those that do. Free 3d simulation software download, free trial, free demo.
Consequently, we focus on softwarebased simulation. Trace generation methodologies many approaches have been proposed to obtain traces on computer systems. Trace driven simulator separates functionality from timing. Execution mechanism of discreteevent driven simulation. When it is practical, this input file contains actual historical records.
Tracedriven simulation is also used in the design of network routers and packet switches. Computer architecture university of pittsburgh executiondriven simulation simulator runs the program, generating a trace onthefly. Pdf tracedriven simulation for energy consumption in. Specifically, the input can be a trace collected from an execution of program on a real microprocessor so called trace driven simulation or a program itself so called execution driven simulation. Timedriven simulation in a timedriven simulation we have a variable recording the current time, which is incremented in fixed steps. Difference between trace drive and execution driven simulator trace driven. Applications in manufacturing, warehouse, supply chain, logistics, automation manufacturing and healthcare. November 6 eventdriven simulation if events arent guaranteed to occur at regular intervals, and we dont have a good bound on the time step it shouldnt be so small as to make the simulation run too long, nor so large as to make the number of events unmanageable, then its more appropriate to use an eventdriven simulation. Trace driven simulation is getting the actual data from a real experiment and feeding. Ddmrp is based on sound flowbased principles to provide planning and execution performance improvements in variable environments where customer tolerance times are dramatically shorter than cumulative lead times a situation that is very common today. Tracedriven simulation has been used to evaluate memory systems for decades. Computer architecture university of pittsburgh execution driven simulation simulator runs the program, generating a trace onthefly. Instruction set architecture isa emulators such as armulator 2 and simplescalar 3 can perform executiondriven cache simulation with a high. Although tracedriven simulators are simpler and faster than executiondriven simulators because they do not model data transformations, tracedriven simulators must be fed from a trace that comes from an execution drivensimulator or an.
With the basic concepts discussed, how is a typical discreteevent driven simulation executed. I heard the terms data driven and event driven model from different folks in past. Tracedriven simulation is a popular technique used to evaluate future computer designs. Considering multicore architectures, a typical tracedriven simulation relies on collecting reference traces in a tracecollection phase based on an. Application of the trace driven process on a software. Data driven programming is a programming model where the data itself controls the flow of the program not the program logic where in case of event driven programming, it is the event not the data itself controls the flow of the program. Executiondriven simulator how is executiondriven simulator abbreviated. In this paper, we describe a new execution drivensimulation tool to evaluateinterconnection networks for distributed memory multiprocessors using real application.
Execution driven simulators combine timing and functionality together. Much smaller instruction traces can be generated to represent the. Individual sample is a signal type that allows the users to simulate timedriven systems in the electrical and optical domain. Twophase tracedriven simulation computer architecture. Simcad process modeling and simulation software is a powerful, easytouse, and visual process simulation tool to build, design, analyze, optimize, and communicate using the latest interactive 3d and 2d animated simulation technology in a no. A tracedriven approach for fast and accurate simulation. Smith gives examples of tracedriven memorysystem studies that date as far back as 1966 smith82, and several surveys of tracedriven techniques have been written since then holliday91. For example, suppose we want to simulate the trajectory of a projectile. Considering multicore architectures, a typical trace driven simulation relies on collecting reference traces in a trace collection phase based on an. Trace based simulation may be used in a variety of applications, from the analysis of solid state disks to the message passing performance on very large computer clusters. Execution driven simulation can be performed at various levels of abstraction, from the algorithmic level to the bitaccurate and cycleaccurate rtl 1. Smith gives examples of tracedriven memorysystem studies that date as far back as 1966 smith82, and several surveys of trace driven techniques have been written since then holliday91. Executiondriven simulators for parallel systems design 1. Tracedriven cosimulation of highperformance computing.
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