Tim Small wrote on 16/05/11 17:59:
On 14/05/11 09:27, [email protected] wrote:
As far as I understand in order to determine HN CPU load produced by
certain CT it is enough to extract 'user', 'system' and 'uptime'
values from /proc/vz/vestat twicely. Then the formula is
ct_cpu_usage=100%*[(user_time_2 + system_time_2) - (user_time_1 +
system_time_1)] / (uptime_2 - uptime_1)
Can't really remember I'm afraid, but that sounds plausible, I think the
figures collected from /proc are a total amount of CPU time used for
each container, so to determine usage, you have to take two readings and
divide by elapsed time. The figure you get is the total across all CPU
cores.
that's exactly what I need for now.
The second question is if there are any plans to implement HN CPU load
produced by particular CT in some of vz* tools (e.g. in vzcpucheck
providing some additional option and print one more column required
info about HN CPU utilization by each container)?
Dunno. Email the developers and see if they'd be willing to accept a
patch in principle?
I guess (and hope) OpenVZ developers are also reading that list. So it
would be interesting and useful to know their opinions on that.
If not (or in any case) - I wonder if a "dstat" plugin might be a good
solution?
Actually I just looked at the dstat man page, and there seems to be a
--vz-cpu option already....
Thanks for pointing that out! I guess dstat is also can be used. But the
implementation of HN CPU utilization by each CT in vz-native tools is
much more preferable way for me since there wouldn't be a need to
install additional third-party software and it would be simpler to
configure sudoers file.
Regards,
Nikolay.
Tim.
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