TOP shows above 100% WCPU usage
Dan Nelson
dnelson at allantgroup.com
Thu Aug 17 19:26:06 UTC 2006
In the last episode (Aug 17), Brent Casavant said:
> Note that IRIX's top does not bias for availabile CPUs -- I've seen
> well-threaded programs using in excess of 2400% CPU.
>
> What it comes down to is that depending on the nature of the
> information you're trying to glean from WCPU, you may want either
> view of the data. Some versions of top on Linux allow you to switch
> between IRIX and Solaris views. From the help screen for top from
> procps 3.2.6 on Linux:
>
> 1,I Toggle SMP view: '1' single/separate states; 'I' Irix/Solaris mode
>
> There's really not a clear cut right and wrong here, particularly if
> your version of top is able to display per-thread instead of
> per-process data. Sometimes you want to break out individual threads
> and see their level of CPU utilization (the IRIX view is most
> useful), sometimes you want to get a handle on which processes are
> loading down a machine (the Solaris view is most useful).
Is this similar to FreeBSD top's 'H' option?
--
Dan Nelson
dnelson at allantgroup.com
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