The twophase structure of the eventdriven simulation algorithm imposes a time scale on the simulation. When it is practical, this input file contains actual historical records. Since all tools share a common infrastructure for trace gathering and retrieving, tool writers can focus on their analysis engines instead. A gem5 tracedriven simulator for fast architecture. 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. Types trace driven vs event driven trace driven process. School of engineering, department of systems and software engineering. Executiondriven simulators for parallel systems design 1. In this paper, we describe a new execution drivensimulation tool to evaluateinterconnection networks for distributed memory multiprocessors using real application. Simcad pro simulation software, modeling, optimization, and predictive analytics with lean and six sigma metrics, create a digital twin of your operation. 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.
The twophase structure of the event driven simulation algorithm imposes a time scale on the simulation. A variety of softwarebased tools have been made available for obtaining traces on. Core concepts within modeldriven development mdd there are two core concepts associated with modeldriven development. We have developed a simulator which models the behavior of a cache manager for a web server. Simulators and such outline what defines a simulator. 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. Considering multicore architectures, a typical tracedriven simulation relies on collecting reference traces in a tracecollection phase based on an. A tracedriven approach for fast and accurate simulation. Trace driven simulation has been used to evaluate memory systems for decades.
Traceability data in modeldriven software development mdsd sv06 can be understood as the runtime footprint of model transformation execution ch06. In a tracedriven simulation whenever a value for a random variable is needed by the simulation, it is read from a data file. A real machine is used to execute a benchmark programsoftware in the native isa. Computer architecture university of pittsburgh executiondriven simulation simulator runs the program, generating. Trace driven simulation derives the model input from a sequence of observations made on a real system mr09. It also details the conditions required for the development of a discovery driven team and an. Computer architecture university of pittsburgh executiondriven simulation simulator runs the program, generating a trace onthefly. 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.
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 this paper, we describe a new executiondrivensimulation tool to evaluateinterconnection networks for distributed memory multiprocessors using real application. When a new request arrives in the simulator, it checks the contents of the cache to see whether the corresponding. After each increment we check to see which events may happen at the current time point, and handle those that do. An execution driven interconnection network simulator. However, trace driven simulators are not good in modelling multithreaded workloads as they cannot model the interaction between multiple threads. Executiondriven simulator how is executiondriven simulator abbreviated. 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. 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. Executiondrivensimulatorsforparallelsystemsdesign anandsivasubramaniam departmentofcomputerscienceandengineering thepennsylvaniastateuniversity. 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.
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. Tracedriven simulation is also used in the design of network routers and packet switches. Consequently, we focus on softwarebased simulation. Trace driven simulator separates functionality from timing. Fast and accurate microarchitectural simulation of. It also details the conditions required for the development of a discovery driven team and an execution driven team. In an executiondriven simulation, the execution of a software is interleaved with the simulation of the underlying hardware. Considering multicore architectures, a typical trace driven simulation relies on collecting reference traces in a trace collection phase based on an. Timedriven simulation working with individual samples one of the main features of optisystem is the mixed signal representation. Timedriven simulation in a timedriven simulation we have a variable recording the current time, which is incremented in fixed steps. Consequently, we focus on software based simulation.
Microarchitecture simulation is an important technique in computer architecture research and. Specifically, the input can be a trace collected from an execution of program on. Instruction traces contain the actual instructions executed during a snapshot. Pdf tracedriven simulation for energy consumption in. This solution of 234 words discusses the difference between a discovery driven team and an execution driven team using examples and case scenarios. 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. 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. Much smaller instruction traces can be generated to represent the. Automatic generation of trace links in modeldriven. 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. 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.
Executiondrivensimulation can yield moreaccurate results than tracedriven simulation. Trace driven simulation is getting the actual data from a real experiment and feeding it to the simulation. They require the user to store the trace files which can grow really large. Tracedriven simulation is a popular technique used to evaluate future computer designs.
Each execution of the event processor subroutine defines one unit of simulated time. Executiondriven simulation can be performed at various levels of abstraction, from the algorithmic level to the bitaccurate and cycleaccurate rtl 1. 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. Individual sample is a signal type that allows the users to simulate timedriven systems in the electrical and optical domain. Much smaller instruction traces can be generated to represent the full continuous trace with much lower costs 6. 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. 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. Difference between trace drive and execution driven simulator trace driven. 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. Tracesevents are prerecorded streams of instructions with some fixed input. With the basic concepts discussed, how is a typical discreteevent driven simulation executed. Traceability in emerging forms of software engineering. Eventdriven tracedriven process pregenerated traces to determine cycle count for trace trace generation software instrumentation special instructions inserted into program.
While a tracedriven simulation is known to be comparatively fast and its. The software application model is defined on a higher abstraction level and then converted into a working application using automated transformation or interpretations. 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. Execution driven 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. Intermediate outputs can be output after each execution of this routine. Trace generation methodologies many approaches have been proposed to obtain traces on computer systems. Instruction set architecture isa emulators such as armulator 2 and simplescalar 3 can perform executiondriven cache simulation with a high. 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. Trace driven simulation is also used in the design of network routers and packet switches. Framework for instructionlevel tracing and analysis of. Tracedriven simulation derives the model input from a sequence of observations made on a real system mr09. When program is run, dynamic trace execution is created. Application of the trace driven process on a software.
Trace driven modeling proceedings of the 1st symposium. Explosive destruction system munitions destruction. Timedriven simulation is synchronous in the sense that all the system activities occur at discrete time intervals which are processor cycles. 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. Time driven simulation is synchronous in the sense that all the system activities occur at discrete time intervals which are processor cycles. 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. The disadvantage is every time the experiment has to be done which is a tedious. I heard the terms data driven and event driven model from different folks in past. Execution driven simulators combine timing and functionality together.
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. The jtrace pro streaming trace capability technically enables instruction tracing of the whole system execution from the startup to its current point. For a good overview of simulation modeling, see 2 and its references. Computer architecture university of pittsburgh execution driven simulation simulator runs the program, generating a trace onthefly. Computer architectural simulation techniques nitish srivastava. Modeldriven development mdd has emerged as one of the leading approaches for enabling rapid, collaborative application development.
In our carwash example, the trace might be a file of the intervals between successive car arrivals recorded while watching the system. Trace driven simulation is getting the actual data from a real experiment and feeding. In case of simulations, before it was ready to be installed, many test runs are done to check its robustness. Application of the trace driven process on a software radio casestudy. Simulation seeks to emulate the execution of a particular workload,v, in a particular environment, 7, the fargef environment. 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. 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. For example, suppose we want to simulate the trajectory of a projectile. Other systems requiring resimulation of a trace must do it on the same machine e. We then present three case studies that illustrate how midas can be used to study architectural design tradeoffs in active. In a trace driven simulation whenever a value for a random variable is needed by the simulation, it is read from a data file. Twophase tracedriven simulation computer architecture. 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.
Tracedriven simulation simulator reads a trace of instructions captured during a previous execution both functional and timing simulator can be built trace simulator cs2410. Hardware instrumentation monitor system bus via hardware. Thus, executiondriven simulation allows feedback fromthe hardware simulator to the software. Execution drivensimulatorsforparallelsystemsdesign anandsivasubramaniam departmentofcomputerscienceandengineering thepennsylvaniastateuniversity.
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. Replays of production load can be an alternative to explicit modeling of job. We focus on execution driven, timing simulators, which are the preeminent tool for evaluation of future. We describe the design of midas, providing details about the various simulation models and how they interact.
A simulator is a software performance model of a processor architecture which. Time driven simulation in a time driven simulation we have a variable recording the current time, which is incremented in fixed steps. It reduces the software engineering effort for building and debugging new tools for trace analysis. Motivation, tools, challenges and prospects javad zarrina, rui l. We focus on executiondriven, timing simulators, which are the preeminent tool for evaluation of future.
Microarchitecture simulation can be classified into multiple categories according to input types and level of details. Mass storage system performance prediction using a trace. Applications in manufacturing, warehouse, supply chain, logistics, automation manufacturing and healthcare. However, when the nal design choices must be done a more precise evaluation study should be performed. Execution mechanism of discreteevent driven simulation. Tracedriven simulation has been used to evaluate memory systems for decades. Tracedriven cosimulation of highperformance computing. 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. Business process simulation software simcad simulation. 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. Instruction set architecture isa emulators such as armulator 2 and simplescalar 3 can perform execution driven cache simulation with a 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 trace driven simulator takes program instructions and address traces and supplies. 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.
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