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let it be
The '''/proc/vz/vestat''' file contains statistics for VE CPU usage.
The ''guessed'' content (may the Gods - blessed thy fingers - acknowledge or reject my humble info here):
* '''VEID''': The VE ID, obviously.
* '''user, nice, system, uptime''': usage in [[jiffy|jiffies]]. These are the equivalents of <code>/proc/stat</code>, but there is no ''idle'' because it cannot be measured this way.
* '''idle, strv, uptime, used''': usage in [[cycle|cycles]]. idle and uptime are obvious, strv isn't used, and used is the used cycles by VE on all CPUs.
* '''maxlat, totlat, numsched''': latency statistics in ''cycles''. maxlat is max latency in cycles meaning how long VE process has to wait before it actually got CPU time; totlat/numsched gives average scheduling latency. '''These do not seem work in OpenVZ, only in Virtuozzo.'''
== Measure conversions ==
Using jiffies:
*seconds = ''measurement'' / jiffies_per_seconds
Using cycles:
*seconds = ''measurement'' / cycles_per_jiffy / jiffies_per_seconds.
Variables:
* ''jiffies_per_second'' = 1000 '''(unless you have changed that in kernel config?)'''
* ''cycles_per_jiffy'' = ''frequency_of_your_cpu'' / ''jiffies_per_second''
* ''frequency_of_your_cpu'' (in Hz) can be read from /proc/meminfo, as:
** <code>cpu MHz : ''frequency_of_your_cpu''</code>
The ''guessed'' content (may the Gods - blessed thy fingers - acknowledge or reject my humble info here):
* '''VEID''': The VE ID, obviously.
* '''user, nice, system, uptime''': usage in [[jiffy|jiffies]]. These are the equivalents of <code>/proc/stat</code>, but there is no ''idle'' because it cannot be measured this way.
* '''idle, strv, uptime, used''': usage in [[cycle|cycles]]. idle and uptime are obvious, strv isn't used, and used is the used cycles by VE on all CPUs.
* '''maxlat, totlat, numsched''': latency statistics in ''cycles''. maxlat is max latency in cycles meaning how long VE process has to wait before it actually got CPU time; totlat/numsched gives average scheduling latency. '''These do not seem work in OpenVZ, only in Virtuozzo.'''
== Measure conversions ==
Using jiffies:
*seconds = ''measurement'' / jiffies_per_seconds
Using cycles:
*seconds = ''measurement'' / cycles_per_jiffy / jiffies_per_seconds.
Variables:
* ''jiffies_per_second'' = 1000 '''(unless you have changed that in kernel config?)'''
* ''cycles_per_jiffy'' = ''frequency_of_your_cpu'' / ''jiffies_per_second''
* ''frequency_of_your_cpu'' (in Hz) can be read from /proc/meminfo, as:
** <code>cpu MHz : ''frequency_of_your_cpu''</code>
