linux system load

hi,all

one or two days per week,sometimes the run queue size is close to 20 , many are close to 1 or 2 but the load-1 is always close to 6
i do not know why, i check the OS net/IO/ram/cpu load ,and make a lot of statspack report all sql do not be slow, the cpu_time/wait_time/Elapsd_time are not changed.

i am vary puzzle.
i want to know what is the formula of load-1 and load-5

i read the sar's source code and find that it read the /proc/LOADAVG i do not read the linux source code

linux redhat as2.1
sar -q 3 2000

    rq size     proc     loda-1     load-5
        1   ,   399   ,   2.69   ,   2.78,
        1   ,   399   ,   2.69   ,   2.78,
        0   ,   399   ,   2.55   ,   2.75,
        4   ,   399   ,   2.35   ,   2.70,
        1   ,   399   ,   2.35   ,   2.70,
        1   ,   399   ,   2.32   ,   2.69,
        2   ,   399   ,   2.32   ,   2.69,
        1   ,   399   ,   2.37   ,   2.70,
        1   ,   399   ,   2.26   ,   2.67,
        0   ,   399   ,   2.26   ,   2.67,
        2   ,   399   ,   2.32   ,   2.67,
        1   ,   398   ,   2.32   ,   2.67,
        1   ,   398   ,   2.14   ,   2.63,
        0   ,   398   ,   2.12   ,   2.62,
        0   ,   398   ,   2.12   ,   2.62,
        0   ,   398   ,   2.27   ,   2.64,
        1   ,   398   ,   2.27   ,   2.64,
        1   ,   398   ,   2.57   ,   2.70,
        2   ,   398   ,   2.45   ,   2.67,
        0   ,   398   ,   2.45   ,   2.67,
        5   ,   398   ,   2.25   ,   2.62,
        0   ,   398   ,   2.25   ,   2.62,
        1   ,   398   ,   2.07   ,   2.58,
        1   ,   398   ,   1.90   ,   2.54,
        1   ,   398   ,   1.90   ,   2.54,
        0   ,   398   ,   1.75   ,   2.50,
        6   ,   398   ,   1.75   ,   2.50,
        0   ,   398   ,   2.01   ,   2.54,
        2   ,   398   ,   2.25   ,   2.58,
        0   ,   398   ,   2.25   ,   2.58,
        3   ,   398   ,   2.31   ,   2.58,
        1   ,   398   ,   2.31   ,   2.58,
        2   ,   398   ,   2.37   ,   2.59,
        1   ,   398   ,   2.26   ,   2.56,
        0   ,   398   ,   2.26   ,   2.56,
        3   ,   398   ,   2.48   ,   2.60,
        1   ,   398   ,   2.48   ,   2.60,
        0   ,   398   ,   2.36   ,   2.58,
        3   ,   398   ,   2.49   ,   2.60,
        0   ,   398   ,   2.49   ,   2.60,
        2   ,   398   ,   2.53   ,   2.61,
        2   ,   398   ,   2.53   ,   2.61,
        2   ,   398   ,   2.33   ,   2.56,
        1   ,   398   ,   2.14   ,   2.52,
        0   ,   398   ,   2.14   ,   2.52,
        2   ,   398   ,   2.05   ,   2.50,
        0   ,   398   ,   2.05   ,   2.50,
        1   ,   398   ,   1.96   ,   2.47,
        1   ,   398   ,   2.05   ,   2.48,
        3   ,   398   ,   2.05   ,   2.48,





 


  

Best regards
msn: biti_rainy_at_hotmail.com
a dba from alibaba(china)

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