Berkeley CSUA MOTD:Entry 23885
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2025/05/24 [General] UID:1000 Activity:popular
5/24    

2002/2/16-17 [Computer/Domains] UID:23885 Activity:nil
2/15    More register is better right? What if I have a machine with 100
        registers... wouldn't it take more time when I need to save all the
        registers during a context switch?
        \_ Register files are implemented as special memories. Similar to
           memories, the larger they are, the slower they'll run. It is
           especially true in high frequency microprocessors that have
           heavily multiported register files. Larger register files also
           consume more power and require a larger specifier field in each
           instruction.
        \_ Yeah it'll take more time to save all the registers, but you can
           make your time slice bigger to compensate for that.
           \_ what if you have a machine with a billion registers?
              \_ You won't have enough RAM to save the states anyway.
        \_ Use register windows, like SPARC.
        \_ Or you can use a window of registers that changes as you switch
           context so you're only saving which window but nevermind.
2025/05/24 [General] UID:1000 Activity:popular
5/24    

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