Berkeley CSUA MOTD:Entry 35380
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2025/07/10 [General] UID:1000 Activity:popular
7/10    

2004/12/21 [Computer/SW/OS/VM] UID:35380 Activity:kinda low
12/21   What are some core differences between a simulator, an emulator, and
        a virtual machine?
        \_ Simulator:  Model the whole thing by itself; collect results.
           Emulator:  Model one part; hook it up to something else.
             Or, run one OS on another OS.
           Virtual machine:  A computer inside a computer.
             Or, a VM like the Java VM.
        \_ Simulator: Models something by mimicry.
           Emulator: Interprets instructions for one architecture to another.
           Virtual machine: A pretty generic term.  There's VM in the sense
             of Java VMs (which represents a virtual hardware architecture)
             or in the VMware sense, in which most instructions aren't
             interpreted).
           \_ so the Crusoe chip (on-demand translation of x86 instruction set
              to another) is... emulation? What about VMWare, is that also
              emulation? What about simulators, what are some well known and
              commonly used simulators out there? Does VirtualPC (for Macs)
              count as simulator because you're not doing emulation?
              \_ VMware is partly emulation (for the virtual devices) but
                 for the most part is virtualization.  VirtualPC for Macs is
                 an emulator; it's interpreting x86 binaries.  Won't comment
                 on the Crusoe.
        \_ What's the context?
        \_ In some contexts, a simulator processes the simulation of an actual
           design, while an emulator accomplishes the same result at a higher
           level. A VM is a software computer environment for a program (a
           computer implemented as a program that runs on another computer).
2025/07/10 [General] UID:1000 Activity:popular
7/10    

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