Difference between revisions of "Vestat"
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* ''jiffies_per_second'' = 1000 '''(unless you have changed that in kernel config?)''' | * ''jiffies_per_second'' = 1000 '''(unless you have changed that in kernel config?)''' | ||
* ''cycles_per_jiffy'' = ''frequency_of_your_cpu'' / ''jiffies_per_second'' | * ''cycles_per_jiffy'' = ''frequency_of_your_cpu'' / ''jiffies_per_second'' | ||
| − | * ''frequency_of_your_cpu'' (in Hz) can be read from /proc/ | + | * ''frequency_of_your_cpu'' (in Hz) can be read from /proc/cpuinfo, as: |
** <code>cpu MHz : ''frequency_of_your_cpu''</code> | ** <code>cpu MHz : ''frequency_of_your_cpu''</code> | ||
Revision as of 15:10, 18 November 2008
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
