Re: SMP per-CPU statistics under FreeBSD.

On Mon, Apr 17, 2006 at 10:43:14AM -0500, Bill WIlson wrote:
> On Mon, 17 Apr 2006 14:03:58 +0000
> Marco van Tol <[email protected]> wrote:
> 
> > I asked on the FreeBSD hackers mailing list whether per CPU statistics were
> > available under FreeBSD, with the intention to modify gkrellm 2.2.9 to
> > support it.  I had seen per CPU statistics with gkrellm under linux, and
> > really liked it.  I'm running an AMD Athlon64 dual-core.
> > 
> > John Baldwin has been very helpful and supplied me a patch to get per-CPU
> > statistics under FreeBSD as that's not available in the main trunk yet.
> > http://lists.freebsd.org/pipermail/freebsd-hackers/2006-April/016093.html
> > 
> > I will try to modify gkrellm 2.2.9 to support what this patch does, and mail
> > a patch for gkrellm over here if I succeed.
> > 
> > Is there anything else I should be aware of while making this attempt?
> 
> The cpu interface is fairly simple and is briefly documented in gkrellm-sysdeps.h.
> The things to know are:
> 
> 1) Give the gkrellm_cpu_set_number_of_cpus() the number of real CPUs (ie
> don't include composite even if you report data for a composite CPU).
> 
> 2) You have the choice of reporting composite CPU data yourself or letting gkrellm
> calculate the composite data.  Just never call gkrellm_cpu_assign_composite_data()
> and gkrellm will do it for you.
> 
> 3) You probably don't need to use the gkrellm_cpu_add_instance() call as it
> is meant for architectures where non-contiguous CPU numbers will be reported.
> This can happen on Solaris where for example the reporting can be for CPU
> numbers 0,1 and 3 with 2 missing.
> 
> 3) You should probably test that your implementation works in client/server mode.
> You can do this on a single machine.  Just start gkrellmd and then run
> gkrellm -s localhost or whatever is needed on FreeBSD.

Thank you very much for these pointers.  Much appreciated! :)
I hope to have something to play with soon.

Marco

-- 
Cool town, evening in the city. Dressing so fine and looking so pretty.
Cool cat, looking for a kitty. Gonna look in every corner of the city.
- Joe Jackson - Summer in the city

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