[rhn-users] CPU usage problem on the Enterprise AS4.0

[Gary Wilson Jr]

I have seen many different types of top outputs.  In your case, it seems
that top is reporting the total %CPU usage.  So...

If a process is using 25% in a 4 processor machine, that means that the
process is using 100% of one processor.  A single process cannot use
more than one processor at a time.  This is also why the process on your
Sun v20z with 2 processors tops out at 50% CPU usage, meaning it is
using 100% of one processor.

LanTu at viatech.com wrote:
> 
> Help!!!
> Has anybody meet problem below on the Enterprise AS4.0?
>  
> I am running Enterprise AS4.0 with Kernel 2.6.9 on the Sun v40z (4 CPUs).
> When I use "top" and "sar" to check CPU usage, only can up reach to
> 25% max.
>  
> Linux 2.6.9-5.ELsmp      05/16/2005
>  
> 11:28:48 AM       CPU     %user     %nice   %system   %iowait     %idle
> 11:28:49 AM       all     24.88      0.00     20.10      0.00     55.02
> 11:28:50 AM       all     25.00      0.00     28.75      0.00     46.25
> 11:28:51 AM       all     25.00      0.00     16.00      0.00     59.00
> 11:28:52 AM       all     25.00      0.00     19.58      0.00     55.38
> 11:28:53 AM       all     25.00      0.00     17.25      0.00     57.75
> Average:          all     24.99      0.00     20.34      0.00     54.67
> I also tried it on the Sun v20z (2 CPUs) and ASUS AP1600R (1 CPUs)
>  
> The CPU usage on the v20z only can reach to 50% max,
> Linux 2.6.9-5.ELsmp       Monday 16,May,2005
>  
> 11:18:36  PDT       CPU     %user     %nice   %system   %iowait     %idle
> 11:18:37  PDT       all     50.00      0.00      0.00      0.00     50.00
> 11:18:38  PDT       all     50.00      0.00      0.00      0.00     50.00
> 11:18:39  PDT       all     50.00      0.00      0.00      0.00     50.00
> 11:18:40  PDT       all     50.00      0.00      0.00      0.00     50.00
> 11:18:41  PDT       all     50.00      0.00      0.00      0.00     50.00
> Average:          all     50.00      0.00      0.00      0.00     50.00
> On the ASUS AP1600R can reach to 100% max.
> Linux 2.6.9-5.ELsmp (pc011.s3g-fr.com)  Monday 16,May,2005
>  
> 11:35:11  PDT       CPU     %user     %nice   %system   %iowait     %idle
> 11:35:12  PDT       all    100.00      0.00      0.00      0.00      0.00
> 11:35:13  PDT       all    100.00      0.00      0.00      0.00      0.00
> 11:35:14  PDT       all    100.00      0.00      0.00      0.00      0.00
> 11:35:15  PDT       all    100.00      0.00      0.00      0.00      0.00
> 11:35:16  PDT       all    100.00      0.00      0.00      0.00      0.00
> Average:          all    100.00      0.00      0.00      0.00      0.00
>  
> 
> 
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> 
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