On Thu, Mar 24, 2011 at 01:45:34PM +0100, Jan Engelhardt wrote:
> On a 24-thread/6-core SPARC T1, lscpu would wrongly output "5 threads
> per core".
Jan, it would be nice to have a dump of /sys and /proc from the
machine. Please, use tests/ts/lscpu/mk-input.sh from git tree -- it
will create a tarball with necessary files.
I'd like to add the dump to our tests.
> It seems that the 6c T1 is simply an 8c T1 where 2c are disabled
> (offering a lesser model for a lower price, and all that marketing
> fluff). So the machine description header of the 6c T1 reports 32
> threads, but only goes on to provide 24 elements thereafter, which is
> why Linux will report threads 24-31 as "offline". So far so good.
>
> But lscpu would take the number of all (online and offline) threads
> (32) and divides it by the number of online cores (6), which yields an
> odd 5.33 threads/core.
>
> Simply pick the number of online threads.
Thanks.
Fixed with as small change, if I good remember the
/sys/devices/system/cpu/online file is not available on all kernels,
so it seems better to keep "nthreads = nsockets * ncores * nthreads"
as a fallback solution.
On Wed, Mar 30, 2011 at 07:09:51PM +0200, Karel Zak wrote:
> Unfortunately, we don't have
>
> lscpu --get=<valuename>
>
> so grep/awk is probably the right way how to parse the output. I think
> this way is pretty unusual in scripts.
s/unusual/usual/ sorry...
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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