Vincent Torri wrote:
> I want to retrieve the number of active processors. I have found that
> using sysconf(_SC_NPROCESSORS_ONLN) could do the trick, but i have
> read somewhere
> (http://forum.soft32.com/linux2/CPUs-machine-ftopict13343.html) that
> it might not return the correct number of processors.
>
> My question is, on Solaris, is it safe to use sysconf() ? Or is there
> a better solution ?
AFAIK the only "easy" way (e.g. without poking in the kernel data) is to
use the |sysconf()| interface.
Examples (I'm using ksh93 since it has a "getconf" builtin which has
functionality which is a superset of { /usr/bin/getconf,
/usr/bin/xpg4/getconf, /usr/bin/xpg6/getconf } and exposes the
|sysconf()| interface for scripts):
-- snip --
# list the number of "configured" CPUs
# (this is the maximum number available to the current OS
# instance, but note that this may change after a reboot)
$ ksh93 -c 'getconf NPROCESSORS_CONF'
16
-- snip --
-- snip --
# list the number of "online" CPUs:
# (this value is dynamic and may be changed by the admins,
# system events (e.g. CPU/memory failure) and other things)
$ ksh93 -c 'getconf NPROCESSORS_ONLN'
14
-- snip --
----
Bye,
Roland
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