As a result, we can maintain good performance of virtual synchronization while overcoming the limitations of the previous execution driven simulation in terms of application. 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. A tracedriven simulation study of dynamic songnian zhou. Kleijnen 36 presents work about validation on trace driven simulation models using bootstrap test on simulation subruns. Introduction to simulation rice computer science rice university. The delay and packet loss statistics are directly coupled to the aggregated traffic. Dec 15, 2018 join us for kubernetes forums seoul, sydney, bengaluru and delhi learn more at kubecon. We use information about job cpu and io demands collected from a production system as input to a. Kleijnen 36 presents work about validation on tracedriven simulation models using bootstrap test on simulation subruns. The simulation framework is composed of a trace driven simulation engine and a dynamicbehavior component that implements the parallelismmanagement operations for the application. One class of approaches to bridge this gap employs trace driven simulation. Considerable effort has been devoted to the development of accurate tracedriven simulation models of todays computer systems.
Kale 1 1 university of illinois at urbanachampaign, 2. One such method, tracedriven memory simulation, has been the subject of intense interest among researchers and has, as a result, enjoyed rapid development and substantial improvements during the past decade. A tracedriven approach for fast and accurate simulation. Tracedriven simulation of multithreaded applications. In contemporary computers, cache memories are interposed between processors and primary memories in order to decrease access time and bus traffic. A tracedriven simulation study of dynamic load balancing in homogeneous distributed systems supporting broadcasting is presented. Because the design of the cache is critical and the factors affecting its performance are complex, tracedriven simulation is widely used and studied. Scalable trace driven parallel network simulation bilge acun 1,2, nikhil jain 1,2, abhinav bhatele 2, laxmikant v. As a result, we can maintain good performance of virtual synchronization while overcoming the limitations of the previous executiondriven simulation in terms of application. Join us for kubernetes forums seoul, sydney, bengaluru and delhi learn more at kubecon. The true measure of the performance of an interconnection network is how well it performs under real communication patterns generated by actual applications.
Using machine learning in tracedriven energyaware simulations of highthroughput computing systems a. This gap needs to be bridged to enable true endtoend fullsystem simulation. Collecting a complete and detailed address trace may be hard, especially if it is to represent a complex workload consisting of multiple processes, the operating system, and dy. Requirements traceability in simulation driven n development the different results of an engineering project tend to be scattered to separate data repositories that store results from a single phase of the project such as requirements acquisition, system modelling or simulation. However, over the last few years, multicore research has moved towards executiondriven simulation. Timedriven simulation is synchronous in the sense that all the system activities occur at discrete time intervals which are processor cycles.
The proposed trace driven simulator models both the communication architecture and the os behavior. Because the design of the cache is critical and the factors affecting its performance are complex, trace driven simulation is widely used and studied. Blocking behavior can also be considered in trace driven simulation. Tracedriven simulation of multithreaded applications yoav etsion. It is an important tool in many simulation applications in which the models inputs are derived from a sequence of observations made on a real system.
Time driven simulation is synchronous in the sense that all the system activities occur at discrete time intervals which are processor cycles. Trace driven simulation is a popular technique used to evaluate future computer designs i1, 2. A tracedriven approach for fast and accurate simulation of manycore architectures anastasiia butko, luciano ost, abdoulaye gamatie, vianney lapotre, rafael garibotti and gilles sassatelli. View the article pdf and any associated supplements and figures for a period of 48 hours. Driving a simulation with an artificial data trace rather than historical data is a useful technique for debugging the logic of a model. Blocking behavior can also be considered in tracedriven simulation. Event driven simulation 3 complex, particularly considering the fanout of b, c, and x1. Specifically, the input can be a trace collected from an execution of program on a real microprocessor so called tracedriven simulation or a program itself so. Due to the increasing deployment of conversational realtime applications like voip and videoconferencing, the internet is today facing new challenges. A tracedriven approach for fast and accurate simulation of. A trace driven simulation study of dynamic load balancing in homogeneous distributed systems supporting broadcasting is presented. For the validation of tracedriven simulation models this paper recommends a simple statistical test that uses elementary regression analysis in a novel way. The result is a tool for trace driven cache simulation that is practical to use for memory performance studies of full sized scienti. Many of the disadvantages of trace driven simulations are more or less obvious.
When a new request arrives in the simulator, it checks the contents of the cache to see whether the corresponding. Project cache organization and performance evaluation 1. One class of approaches to bridge this gap employs tracedriven simulation. Tracedriven simulation for energy consumption in high throughput computing systems. Once acquired, it can be used to drive simulation studies. The trace is a time ordered sequence of events message generation events in our case that happened during the execution of the application. Tracedriven cosimulation of highperformance computing. The impact on the network design cycle will be quite large because of the cumulative speedup in successive refinements of the router design. In this assignment, the memory reference events speci.
Pdf tracedriven simulation for energy consumption in. However, it seems that there are no outliers existing in the sampling. Techniques for the tracedriven simulation of cache. Introduction trace driven simulation is a popular technique used to evaluate future computer designs i1, 2. Low endtoend delay is a vital qos requirement for these applications, and the best effort internet architecture does not support this natively. In practice, however, replicating a simulation generally requires much more computer time than bootstrapping a simulation. The proposed tracedriven simulator models both the communication architecture and the os behavior. Thus, the gain in term of simulation time using the proposed td approach depends on the number of events collected and. Pdf tracedriven simulation is commonly used by the computer architecture research community to pursue answers to a wide variety of. It is an important tool in many simulation applications in which the models inputs are derived.
Trace driven modeling proceedings of the 1st symposium. Instead of by an exact model of their behavior, computing nodes are represented by a trace that. Running such a largescale workload on a large topology and a broad range of scenarios raises signi. Trace driven or correlated inspection simulation means that the simulated and the real systems have some common inputs say, historical arrival times so that the two systems outputs are crosscorrelated. Tracedriven simulation can be an attractive way of exploring multilevel cache designs and. Trace driven simulation using sampled traces ieee conference. Tracedriven simulators such dineroiii 4 accept a chronological stream of memory references and evaluate miss statistics based on the selected configuration. Tracedriven simulation is a faster and increasingly common way of evaluating memory systems. Stephen mcgough, noura al moubayed school of engineering and computing sciences. A tracedriven simulation study of dynamic load balancing. The workload traces for the simulations come from web server access logs, from six different internet web sewers. When performing a trace driven simulation of a high throughput computing system we are limited to the knowledge which should be available to the system at the current point within the simulation. School of computing science, newcastle university, newcastle upon tyne, ne1 7ru england.
Trace driven simulator separates functionality from timing. To validate such a simulation, this paper focuses on the. In this paper, we use trace driven simulation to evaluate the effects of various replacement, threshold, and partitioning policies on the performance of a web sewer. Our solution advances stateof theart in tracedriven simulation through its ability to accu rately simulate a computer architecture made of m cores based on. This article surveys and analyzes these developments by establishing criteria for evaluating trace driven methods, and then applies these criteria to describe, categorize, and compare over 50 trace driven simulation tools. Computer architectural simulation techniques nitish srivastava. Trace driven modeling proceedings of the 1st symposium on. Specific sequences of otherwise random events can be forced to reoccur in a model that is being tested or enriched. Simulation seeks to emulate the execution of a particular workload,v, in a particular environment, 7, the fargef environment. Pdf this paper argues that it is wrong to require that regressing the outputs of a tracedriven simulation on the observed real outcomes should give a. Microarchitecture simulation can be classified into multiple categories according to input types and level of details. Tracedriven analysis of icn caching algorithms on video. They require the user to store the trace files which can grow really large.
Trace driven simulation for energy consumption in high throughput computing systems. Then, at simulation time, these operations are reproduced by invoking their implementation in the dynamicbehavior component. The tracedriven simulation is 3 to 4 times faster than the executiondriven one with an. Tracedriven or correlated inspection simulation means that the simulated and the real systems have some common inputs say, historical arrival times so that the two systems outputs are crosscorrelated. We develop a custom requestlevel simulator called icache for our analysis that provides. Note that instead of generating responses through bootstrapping we may generate more simulation responses. Pdf operating system impact on tracedriven simulation. 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.
Simulation types in computer architecture conferences. We use information about job cpu and io demands collected from a production system as input to a simulation model that includes a representative cpu scheduling policy and. Trace driven simulation approaches allow to abstract selected components of the system under analysis by creating traces during the execution time of an application. The network is considered to have failed if the program is prevented from completing due to undeliverable messages. Many times the modeler is so focused on the problem being studied that the content of the input trace used in the evaluation is overlooked. 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. Low cost tracedriven memory simulation using simpoint. Computer architectural simulation techniques nitish. However, the trace log contains information we would not be privy to during the simulation. Tracedriven simulation of document caching strategies for.
Tracedriven analysis of icn caching algorithms on videoon. Although tracedriven methods have been successfully applied to other domains of computer architecture, such as the simulation of superscalar processor. Although conceptually simple, a number of factors make tracedriven simulation difficult in practice. Pdf tracedriven simulation for energy consumption in high. Trace driven simulation we have developed a simulator which models the behavior of a cache manager for a web server. Requirements traceability in simulation driven development. We use information about job cpu and 10 demands collected from a production system as input to a simulation model that includes a. The problem lies with the static gate scheduling which is implicit in the code of figure 31. Project cache organization and performance evaluation.
No simulation execution driven dynamic binary instr. We have developed a simulator which models the behavior of a cache manager for a web server. Smith gives examples of tracedriven memorysystem studies that. Twophase tracedriven simulation computer architecture. 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. Although conceptually simple, a number of factors make trace driven simulation difficult in practice. Tracedriven hwsw cosimulation using virtual synchronization. However, tracedriven simulation has many advantages over executiondriven that are being missed in multithreaded application simulations.
To validate such a simulation, this paper focuses on the difference between the average simulated and real responses. A trace driven simulator takes program instructions and address traces and supplies them to microarchitectural simulator. The trace, which we will provide for you, was acquired on another machine. Smith gives examples of trace driven memorysystem studies that. A gem5 tracedriven simulator for fast architecture. Tracedriven simulation approaches allow to abstract selected components of the system under analysis by creating traces during the execution time of an application. The simulation framework is composed of a tracedriven simulation engine and a dynamicbehavior component that implements the parallelismmanagement operations for the application. Figure 1 shows the simulation type used in the papers from four of the. 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.
A case study of tracedriven simulation for analyzing. Tracedriven simulation is a third approach with a level of complexity in between the above two. The main drawback of current simulation approaches is the long simulation times in order to extract performance metrics while varying a system parameter. Trace driven 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. In this paper, we use tracedriven simulation to evaluate the effects of various replacement, threshold, and partitioning policies on the performance of a web sewer.
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