On Wed, Aug 6, 2008 at 3:07 PM, Piotr Jaroszyński
wrote:>>> I want to be able to convert starttime from /proc/#/stat to absolute>>> time and it seems that I need HZ to do that as it is measured in>>> jiffies. How can I get HZ? I have seen some discussion about this but>>> haven't found a definite answer. procps is using some hacks do it and>>> I would prefer to avoid them.>>> I only need a solution for modern kernels, say 2.6.20+ if that matters.>>>> `man sysconf`, in particular you want sysconf(_SC_CLK_TCK).>> manpage says it's obsolete and i read in some discussion that it only> returns the default and not the real HZ used.
I believe the claim that it's out of date is out of date. manpages3.0.1 has an update to this, according to a message I saw on this lista month or so ago.
Regardless, the fields you're reading should all be showing USER_HZwhich is fixed at 100 per second regardless of the underlying kernelHZ parameter.
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