[Gllug] hourly/daily rate for linux systems admins?

[Nix]

On 23 Nov 2010, Karanbir Singh told this:
> As another example, when asked to find per-process blockdev i/o rate, 
> only 1 out of 8 people actually looked in /proc/<id>/; a couple 

I'm sorry, where is this? I just hunted for it and can't see anything
relating to per-process blockdev I/O there. I had no idea Linux tracked
such things on a per-process basis (in fact I can remember patches to do
such things being rejected in the past).

Of course what I do now is dig into the source tree, and find that the
third-from-last /proc/{pid}/stat entry is the per-task I/O delay figure,
which may be what you referred to. This is seriously obscure stuff: it
was added in 2006, but the only distro which appears to have packaged
the userspace side of this is OpenSUSE. I can't find any sign of an
upstream source tree at all.

Anyone who correctly answers this question is a kernel deity, or
Shailabh Nagar :)

> dismissed it as only available in >= 2.6.2X; the rest just went faffing 
> about with iostat / vmstat / <randomtool>.

That's what I'd have expected, and I've been using and learning about
Linux obsessively for fifteen years now.
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