On Fri, 13 Nov 2009, Bruce Evans wrote:
>>> Just print %CPU in %4.0f format when it is >= 99.5 (or whatever rounds to
>>> 100.0). This works up to 999.5 %CPU.
>>
>> Actually, %4.0f works up to 9999.5 %CPU because there's no '.' in the
>> result. I think this is an excellent solution. And since FreeBSD
>> currently has a hard limit of 64 CPUs, it's unlikely to be exceeded for a
>> while.
>
> Oops.
With 128-thread hardware just around the corner, we should be working to scrub
assumption of 32 or 64 core limits wherever we find them. I don't know what
the next "reasonable" limit is, perhaps 1024, but arrays indexed by MAXCPU are
becoming decreasingly useful in that light. The dynamic per-CPU stuff for the
kernel addresses some but not all of these problems.
Robert N M Watson
Computer Laboratory
University of Cambridge