Once acquired, it can be used to drive simulation studies. Introduction trace driven simulation is a popular technique used to evaluate future computer designs i1, 2. This methodology has been tested on two direct networks, with 16 and 64 nodes respectively, running the fft and radix applications of the splash2 suite. 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. After creating or importing the geometry, you can merge in existing source models or create your own. Csece 757 parallel computer architecture spring 2016. Trace driven simulation has been used to evaluate memory systems for decades. In a trace driven simulation whenever a value for a random variable is needed by the simulation, it is read from a data file.
In the first part, the simulation engine executes tasks on component simulators, captures execution traces, and provides them to the task representatives of the second part of the cosimulator. As fullsystem simulation becomes more popular and workloads become longer, methodologies such as statistical simulation and phase detection have been proposed to produce reliable performance analysis in a small amount of time 12, 21, 22, 30. First, we present a detailed microarchitectural characterization of production search services using. 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. Figure 1 shows the simulation type used in the papers from four of the. Give traces, in the style of the trace given in this section, showing how the keys e a s y q u e s t i o n are sorted with topdown mergesort and with bottomup mergesort. Obviously, tracedriven simulation implies that the two members of the pair, are crosscorrelated. An event is defined to be a change in the value of a net. It includes the all important trace mapping step, which allows simulations to capture the behavior of the pcb much. Trace driven simulation can be an attractive way of exploring multilevel cache designs and. Timedriven simulation discretize time in quanta of size dt. A viable alternative is to separate the system component of interest, e. Data driven verification and compositional reasoning for automotive systems chuchufan, bolunqi, sayan mitra, mahesh viswannathan university of illinois at urbanachampaign cav 2017, heidelberg, germany. A tracedriven approach for fast and accurate simulation of.
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. Trace driven simulation of rate adaptive mpeg4 vbr video arne lieand jirka klaue sintef ict, dept. Such simulators should combine efficient modeling, debugging and simulation capabilities for verifying the software development, while meeting the expected. Arpacidusseau university of wisconsinmadison facebook inc. In order to implement a simulation driven product development a number of preconditions were identified. The addresses are generated by recording all memory referenced during. Initial simulations can be driven from the sigrity systemsi tool using extracted spice models created by sigrity. Does the abstract inplace merge produce proper output if and only if the two input subarrays are in sorted. We summarize the important terminology and basic concepts here. A tracedriven simulation reads a fixed sequence of trace records from a file as an input. Regardless of whether the interpreted or the compiled technique is used, when the simulation of a vector. Begin by studying trace driven single server queue follow that with a trace driven machine shop model. We develop a custom requestlevel simulator called icache for our analysis that provides. Pdf this paper focuses on the difference between the average simulated and real responses.
Computer architectural simulation techniques nitish srivastava. The trace, which we will provide for you, was acquired on another machine. Constrainedrandom, coverage driven approach using uvm testing at ip block and soc level testplan requirements tracking coverage metrics functional coverage with sv covergroups assertion coverage with sva covers code coverage statement, branch, expression, condition, fsm signoff requirements. Performance analysis through synthetic trace generation. General concept the proposed tracedriven td simulation approach is com posed of three phases as shown in fig. Uhlig intel microcomputer research lab, hillsboro, or trevor n. Trace driven memory simulation tools such as metasim tracer 1 capturetheaddress stream of anapplicationduring an instrumented program run. Such simulators should combine efficient modeling, debugging and. Internally, an event is represented as a data structure similiar to that of.
Add multiple source if needed and then monte carlo ray trace from the source. The tracedriven simulation is 3 to 4 times faster than the executiondriven one with an average error of 4% in total execution time. The trace relationship is a specialization of an abstraction, connecting model elements or sets of elements that represent the same concept across models. Simulation methodology this methodology is based on trace driven simulation which is the process of running a simulation model of cache that is fed program address traces as input.
Trace driven simulators such dineroiii 4 accept a chronological stream of memory references and evaluate miss statistics based on the selected configuration. Tracedriven analysis of icn caching algorithms on video. A first course steve park and larry leemis college of william and mary. It shows about 44% enhanced performance for the workload of ms of. Techniques for the tracedriven simulation of cache performance. A framework of dynamic data driven simulation based on smc methods is presented in section 2. Because the design of the cache is critical and the factors affecting its performance are complex, trace driven simulation. However, over the last few years, multicore research has moved towards execution driven simulation. Modeling of a busbased disruption tolerant network trace. Then we give board statements on system analysis approaches.
These simulations can include various spicesparameter interconnect models and component models. This part covers the meshing and preprocessing for a pcb warpage simulation. Techniques for the tracedriven simulation of cache. 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. Low cost tracedriven memory simulation using simpoint. They require the user to store the trace files which can grow really large. The network model includes models of the adapter and switch modules. Trace driven memory simulation how is trace driven memory simulation abbreviated. Trace driven modeling proceedings of the 1st symposium. Event driven simulation is designed to eliminate unnecessary gate simulations without introducing an unacceptable amount of additional testing. If overlap, roll back the clock to the time of the collision, update the velocities of the colliding particles, and continue the simulation. When a new request arrives in the simulator, it checks the contents of the cache to see whether the corresponding. 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. 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.
On the simulation of largescale architectures using multiple. Background in this section, we present an overview of dns and survey related work. The remainder of this report is structured as follows. No simulation execution driven dynamic binary instr. Mudge university of michigan, ann arbor, mi as the gap between processor and memory speeds continues to widen, methods for evaluating memory system designs before they are implemented in hardware are becoming increasingly important. Datadriven verification and compositional reasoning. Trace driven simulation is a faster and increasingly common way of evaluating memory systems. Analysis of hdfs under hbase a facebook messages case study tyler harter, dhruba borthakur, siying dong, amitanand aiyer liyin tang, andrea c. Tracedriven simulation of multithreaded applications.
Traces are often used to track requirements and model changes, typically in a traceability diagram, or in a class, use case, object or composite structure diagram. We develop this work based on the application of wildfire spread simulation using the devsfire model 5, 6. Computer architecture university of pittsburgh execution driven simulation simulator runs the program, generating a trace onthefly. The sigrity speed2000 tool plays an important role in moving from initial reflection simulations to signofflevel poweraware simulations that include the impact of simultaneous switching noise. The accuracy of tracedriven simulation of multiprocessors. A trace driven simulator takes program instructions and address traces and supplies them to microarchitectural simulator. Tracedriven memory simulation how is tracedriven memory. When it is practical, this input file contains actual historical records. The program than absorbs, reflects, transmits, and scatters off each surface to singular or multiple observation planes. Al though tracedriven simulations are fairly accurate, they are both time and spaceconsuming which makes them sometimes impractical.
We present ways of generating execution traces for the simulation engine and report some results obtained by executing both real and syn. Computer architecture university of pittsburgh executiondriven simulation simulator runs the program, generating a trace onthefly. This book starts off with an introduction to network simulation in chap. 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. Next,we present the performance metric s usedtoevaluate the performance of eachreplacemen t policy used in the study. Microarchitecture simulation can be classified into multiple categories according to input types and level of details. Although trace driven simulation allows fast evaluation of design alternatives, the. The concept of an event is central to this simulation technique. To address this limitation, this paper proposes a novel tracedriven simulation approach. For a good overview of simulation modeling, see 2 and its references. Xi yi we suppose that the simulation model has at least one more input variable e. Tracedriven cosimulation of highperformance computing.
Executiondriven simulation of multiprocessors citeseerx. Advanced verification management and coverage closure. Simulation types in computer architecture conferences. Dns overview the design of the internet dns is speci. The term describes an operational solution for a team managing some financial data daily liquidity monitoring for the next 500 days, that i implemented to use sas and other desktop tools. Highlevel timing analysis of concurrent applications on. Extending gem5garnet for efficient and accurate trace. These are mostly in the area of tracedriven program simulation.
In contemporary computers, cache memories are interposed between processors and primary memories in order to decrease access time and bus traffic. A description of the different types of traces is provided, followed by survey and discussion of the following trace issues. We have developed a simulator which models the behavior of a cache manager for a web server. Trace driven cosimulation the proposed trace driven hwsw cosimulation consists of two parts figure 3. Executiondriven simulation of multiprocessors acm digital library. As one of the two main approaches, simulation can be carried out in time driven and event driven modes. View the article pdf and any associated supplements and figures for a period of 48 hours. However, the trace log contains information we would not be privy to during the simulation. Tracedriven simulation for energy consumption in high. Obviously, trace driven simulation implies that the two members of the pair, are crosscorrelated. 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. You will need to implement a tracedriven cache simulator, and use it to evaluate the performance of different cache architecture features. These trace records usually represent memory references, branch outcomes, or. Tracedriven simulation simulator reads a trace of instructions captured during a previous execution both functional and timing simulator can be built trace simulator cs2410.
To evaluate this validation statistic, the paper develops a. Therefore, it was decided that direct simulation comparison between the modeled data source and the trace data source would be meaningless. Simplescalar austin, larsen, ernst 2002 similar to trace driven simulation except program under study and simulation are interleaved produce and consume event stream in interleaved fashion key advantages over trace driven simulation avoids specialized hardware for collecting. A buffer management scheme for improving random writes. School of computing science, newcastle university, newcastle upon tyne, ne1 7ru england. In a tracedriven simulation whenever a value for a random variable is needed by the simulation, it is read from a data file. Computer architectural simulation techniques nitish. Running such a largescale workload on a large topology and a broad range of scenarios raises signi. Considerable effort has been devoted to the development of accurate trace driven simulation models of todays computer systems.
Tracedriven simulation has been used to evaluate memory systems for decades. A tracedriven simulation study of twolevel cache systems. A case study of tracedriven simulation for analyzing. Pdf an interactive graphical tracedriven simulator for. However, trace driven simulators are not good in modelling multithreaded workloads as. For the validation of tracedriven simulation models this paper recommends a simple statistical test that uses elementary regression analysis in a novel way. Third, we develop a prototype system and show using trace driven simulation and realworld. Scalability of trace analysis tools rice university. Tracedriven cosimulation of high performance computing. Project cache organization and performance evaluation 1. 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.
Time driven simulation is synchronous in the sense that all the system activities occur at discrete time intervals which are processor cycles. In our carwash example, the trace might be a file of the intervals between successive car arrivals recorded while watching the system. Using a trace driven simulation of epidemic routing, we show that this ner grained routelevel model of intercontact times predicts performance much more accurately than the coarsergrained aggregated allbuspairs model. Branch trace compression for snapshotbased simulation. At any time the simulation process can be aborted from the gui graphic user interface. Then, future continuation research can target additional features and refinements to. Trace driven simulation for energy consumption in high throughput computing systems.
Unifying testing and observability ted young, lightstep this talk proposes a fundamentally new approach to tracing and monitoring. A tracedriven approach for fast and accurate simulation. It is important to note that the general concept of dynamic data driven simulation and the. Introduction to simulation rice university, computer science. Update the position of each particle after every dt units of time, and check for overlaps. Execution driven simulators combine timing and functionality together. Highly non linear model linear components point to point communication sequential processor performance global cpu speed per blocksubroutine non linear components synchronization semantics blocking receives rendezvous resource contention cpu. Sep 27, 2017 data driven from a control file is also an effective solution beyond simulation problems.
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