sparc64/119240 top has WCPU over 100% on UP system

Craig Butler craig001 at
Wed Jan 7 00:33:05 UTC 2009

Hi All

I think its safe to shelve this PR for now, it does not appear to be a
fault and I have seen the same result on other architectures, namely x86
and x64.

I think its due to the way that top works the weighted average out, if
its polling it over a period it could be possible to get above 100%
result for WCPU.  

The -C flag appears to display the raw CPU usage at that point of time
and does not go over 100%


Craig Butler

On Tue, 2009-01-06 at 21:20 +0000, Craig Butler wrote:
> The following reply was made to PR sparc64/119240; it has been noted by GNATS.
> From: Craig Butler <craig001 at>
> To: bug-followup <bug-followup at>
> Cc:  
> Subject: sparc64/119240 top has WCPU over 100% on UP system
> Date: Tue, 06 Jan 2009 21:16:36 +0000
>  Hello
>  I have also seen the same result on sparc64 and amd64 kit,  I have
>  looked into it a bit on google and the general feeling is that the WCPU
>  (or weighted CPU) count is not all that accurate.
>  A more accurate representation can be obtained by passing the -C flag
>  when starting top.  This is for raw CPU rather than a weighted average,
>  on some quick tests on a V120 whilst running buildworld I have not seen
>  a reading above 100%.
>  Kind Regards
>  Craig Butler
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