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Damn Simics

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introduction the simulator for solaris system

introduction the simulator for solaris system

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  • You may need to type: export VTECH_LICENCE=/home/software/simics-2.0.26/licenses After this, a file with name .flexlmrc should be created in your home directory
  • Transcript

    • 1. What the hell is Simics? September 21, 2007 (Part of the slides are from CSE 532 Tutorial) NOTE: Some of the contents here are outdated. Esp. Simics 2.0 is no longer supported by VirtuTech. You have to install and use Simics 3.0.
    • 2. Overview of Simics
      • Virtutech Simics 3.0.x or 2.2.x
        • Academic licenses available in department
        • Get your own free for one year, renewable
        • http://www.virtutech.com
      • Full system simulator
        • Operating System
        • Libraries, Applications
    • 3. Some keywords
      • Host Machine
        • Where you run the simulation
        • Windows, Linux, Solaris host machines
      • Target Machine
        • What you want to simulate
      • Module
      • Configuration
      • Script
    • 4. Take a look
    • 5. Another look
    • 6. Last look
    • 7. What to simulate? CPU Uniprocessor Credit: GEMS@Wisc Symmetric Multiprocessor Glueless Multiprocessor Multiple-CMP CMP CMP CMP CMP P Chip Multiprocessor (CMP) P P P $ $ $ $
    • 8. System level simulator
      • “ Virtutech Simics is a full system simulation platform that provides a controlled, deterministic, and fully virtualized environment.”
      • Models the entire machine that OS sees
        • it can run anything target system can
      • Vital for tracing OS-intensive workload
      • Simics is a hardware simulator
    • 9. Full System Simulation
      • Microprocessor design
      • Memory studies
      • Device development
      • Operating system emulation
      • OS development
      • Debugging
      • High-availability testing
        • Please see the “ Simics:A Full System Simulation Platform” paper for the details.
    • 10. Simics helps a lot
      • Used in various research areas
        • Access to shared-memory system / message-passing system
        • Run real parallel programs.
        • Inspect what happens in the system. (e.g. examine cache coherent traffic.)
        • Study the system parameter’s impact to the performance.
        • Test out new synchronization atoms/coherent protocol.
    • 11. Fast or slow simulator?
      • Simulate instruction by instruction
      • Fast enough to run real applications
      • 100x slowdown with statistics
      • ~5-10MIPS. Faster than sim-fast, a simulator in the simplescalar suite
      • However, the truth is that simulation is always slow
    • 12. Flexibility with modules
      • User pluggable modules enable detailed simulation of required hardware components
        • Caches, out-of-order Microarchitecture,…
      • A variety of statistics available to use
      • Simics API has more than 200 exported functions, several data types, and more than 50 predefined interfaces. The API is written in C.
    • 13. Simulator Translation Cache
      • STC enables statistical-accuracy as well as efficiency.
        • a mechanism in the simulator to improve simulator performance. Among other things, it filters uninteresting memory accesses from the memory hierarchy.
        • istc-disable
        • dstc-disable
    • 14. How to simulate multiprocessors?
      • Simulate on each processor for certain number of cycles
      • cpu-switch-time
        • default: 1000 cycles
      • Cycles
        • Number of cycles
      • Steps
        • Number of instructions (os and application)
    • 15. Start Simics
      • cd $SIMICS_HOME
      • ./simics
      • ./simics -x firststeps.simics
      • ./simics -c configuration
      • -stall
      • -no-win
      • -help
    • 16. Pause/Stop the simulation
      • ctrl + c
      • Temporal breakpoint
        • cc N (cycles)
        • c N (steps)
      • Memory/Register/IO breakpoint
      • Graphics breakpoint
      • Text output breakpoint
      • magic breakpoint
        • magic instruction
    • 17. Checkpoints
      • Save the states:
        • simics> write-configuration blabla
        • simics> exit
      • Resume
        • ./simics -c blabla
        • simics> read-configuration blabla
    • 18. Access Host Files
      • You can access the host file system by mounting it to the simulated machine.
        • The /host file system is mounted as read-only
        • Do not execute files on host system directly, instead, copy it to simulated machine and run
    • 19. Execution Model
      • In-Order execution: An instruction can not be issued unless the previous instruction completes, no matter how many simulated cycle it takes.
      • Out-of-Order execution (only available for sparc targets). Instruction stalls only if the instruction’s true dependencies are not completed.
    • 20. Default Timing Model
      • Default timing model
        • In-Order execution: An instruction use exact one clock cycle.
        • Out-of-Order execution: Control or data dependency will cost one clock cycle.
    • 21. User Defined Timing Model
      • Memory Hierarchy Interface
        • Instruction fetch visibility
          • cpu0.instruction-fetch-mode instruction-cache-access-trace
        • Timing model
          • User define a timing model function which will be called when memory request occurs.
          • The function should return the number of cycles to stall the instruction.
          • If return nonzero, Simics will stall that number of cycles
    • 22. Setup your own Simics
      • Simics 2.2.12
        • Build on what Chun LIU left years ago
      • Simics 3.0.11
        • Build on the department installation
      • Simics 3.0.29
        • Download it yourself
          • Windows on x86
          • Linux on x86
          • Solaris on SPARC
          • Linux on AMD64
      Note: As Simics is evolving quite rapidly and many bugs are fixed in later versions, users are generally recommend to upgrade. Possible compatibility issues are read in the RELEASENOTES.
    • 23. Setup Simics 2.2.12
      • 1. go to any directory you want to install simics-2.2.12
      • 2. run /home/csl/chliu/simics-2.2.12/scripts/user-install.sh /home/scalp/chliu/simics-2.2.12/
      • 3. run /home/mdl/yding/image/chliu.sh instead of /home/csl/chliu/simics-2.0/simics_install
      • 4. go to simics-2.2.12/v9-sol8-64/lib
      • 5. make v9
      • 6. go to simics-2.2.12/home/sarek
      Successfully tested on eru as of 09/21/2007
    • 24. Setup Simics 2.2.12 (cont’d)
      • You have a version to run!
      • ./simics -c s1p
        • s2p, s4p, s8p as well in the directory
      • Configurations from 2 to 24 processors available in /home/mdl/yding/image/
        • You may not be able to access, though
        • Most research work has results up tp 16 processors
    • 25. Setup Simics 3.0.11
      • Simics 3.0.11 Base Install Directory: /home/software/simics-3.0.11
        • home/ contains configurations of the target machines.
        • src/ contains the framework for developing new Simics modules (including the examples).
        • {host}/ (such as v9-sol8-64/ or amd64-linux/ ) contains the object files and specific modules or libraries developed by the user.
    • 26. Setup Simics 3.0.11
      • Create Personal Workspace
        • setenv SIMICS_HOME ./simics-workspace
        • /home/software/simics-3.0.11/bin/workspace-setup $SIMICS_HOME
        • Change dir to $SIMICS_HOME
          • compiler.mk : compiler configuration
          • config.mk : general configuration (shouldn’t have to edit)
          • GNUmakefile : The Makefile
          • modules /: user-created module source code
          • simics : simics executable
          • targets/: configuration for various targets
          • v9-sol8-64 /: host-specific object and library files
    • 27. Recompiling Simics (with user modules)
      • Change dir to $SIMICS_HOME
      • Edit compiler.mk
        • Change the CC variable in v9-sol8-64 and add a CXX variable:
          • CC=cc –Kpic
          • CXX=cc
      • Type gmake
      • You should have an executable called simics 
    • 28. Variations
      • GEMS
        • Wisconsin
          • http://www.cs.wisc.edu/gems/
        • Version 1.3
      • Flexus
        • CMU
          • http://www.ece.cmu.edu/~simflex/flexus.html
        • Version 2.1.1
    • 29. Resources
      • Some intruduction papers online, such as Simics: A Full System Simulation Platform, IEEE Computer, 2002
      • Simics User Guide
        • Much thinner than you think
        • Read it first
      • Simics Forum
        • http://www.simics.net
      • Quite a few people in CSE department
    • 30.  

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