On Thursday 10 April 2008 10:48:45 am Marc Fournier wrote:
> Hello,
>
> I have a RH5 machine where load is quiet inequally distributed, as
> reported by sar:
>
>             CPU   %user   %nice  %system  %iowait   %steal  
> %idle Average:       all    3.26    0.00    1.80    0.02  
> 0.00   94.92 Average:        0   20.73    0.00   10.78  
> 0.05    0.00   68.44 Average:        1    0.68    0.00  
> 0.53    0.00    0.00   98.78 Average:        2    1.07  
> 0.00    0.65    0.00    0.00   98.28 Average:        3  
> 0.73    0.00    0.48    0.01    0.00   98.78 Average:      
> 4    0.62    0.00    0.49    0.05    0.00   98.84 Average:  
>     5    0.70    0.00    0.50    0.04    0.00   98.77
> Average:        6    0.69    0.00    0.44    0.00    0.00  
> 98.87 Average:        7    0.75    0.00    0.48    0.00  
> 0.00   98.76
>
> The machine runs apache (prefork-mpm) which serves php pages from an
> NFS mount.
>
> As the machine is not very loaded, it's not really a problem. But I'm
> wondering what will happen when load rises.
>
> Should I worry about weirdness ? Is it possible to alter the way the
> scheduler work ?

Since there's simply no load to distribute, the first core of the first cpu
gets used pretty much all the time. Shouldn't be anything to worry about. But
there are web server performance test suites out there (basically, they open
up a ton of http connections to your server) that you could use to
artificially throw a ton more load at the box and see how it behaves under
load.

--
Jarod Wilson
jwilson@(protected)

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