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    SubjectRE: Context switch Tick
    On Wed, 2 Jun 2004, Garboua Nahil Y Contr WRALC/MASFE wrote:

    > Okay, vmstat show me the cs according to current load, what is the Maximum
    > tick rate?
    > A process requests a 1 microseconds sleep, or even 500 nanoseconds, how long
    > does it actually sleep, that is why I need to know max tick rate for context
    > switch for a given CPU.

    Can't you just measure it?

    Script started on Wed Jun 2 16:48:51 2004
    # ./tester
    Testing CPU Speed (once at start of program)
    CPU speed = 2803766848 Hz
    Cycles to make the two function calls = 88
    It took 55625156 cpu cycles or 19839.437091 microseconds.
    # exit
    Script done on Wed Jun 2 16:48:57 2004

    That was for a usleep(1). Source attached.


    Cheers,
    Dick Johnson
    Penguin : Linux version 2.4.26 on an i686 machine (5570.56 BogoMips).
    Note 96.31% of all statistics are fiction.

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