Difference between revisions of "Vestat"
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* '''VEID''': The VE ID, obviously. | * '''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. | * '''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. | + | * '''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 '' | + | * '''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 == | == Measure conversions == | ||
Revision as of 12:39, 23 March 2009
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 jiffies. These are the equivalents of
/proc/stat, but there is no idle because it cannot be measured this way. - idle, strv, uptime, used: usage in 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/cpuinfo, as:
cpu MHz : frequency_of_your_cpu
