Difference between revisions of "Nova Compute Load Averages"
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== Proposal == | == Proposal == | ||
| − | The proposal is to have the drivers returns a tuple of the 1, 5 and 15 minutes based system load averages normalized by the number of CPUs in the system. So a load average of 1 means the system is loaded all the time even if there is 1 or n CPUs . | + | The proposal is to have the drivers returns the following information in a dictionary. The load average will be in a tuple of the 1, 5 and 15 minutes based system load averages normalized by the number of CPUs in the system. So a load average of 1 means the system is loaded all the time even if there is 1 or n CPUs . |
| + | { | ||
| + | "up": 5.22, | ||
| + | "users": 3, | ||
| + | "loadavg": (0.2, 0.55, 0.01) | ||
| + | } | ||
=== Implementation Details === | === Implementation Details === | ||
An additional method `get_host_loadavg` will be added to `virt.driver.ComputeDriver`. This method will returns a tuple of the last 1, 5, and 15minutes of the system load average normalized by the number of CPUs by invoking the standard command `uptime` | An additional method `get_host_loadavg` will be added to `virt.driver.ComputeDriver`. This method will returns a tuple of the last 1, 5, and 15minutes of the system load average normalized by the number of CPUs by invoking the standard command `uptime` | ||
Revision as of 13:59, 17 February 2014
Contents
Introduction
The system load averages for the past 1, 5 and 15 minutes are returns by the command "uptime" on linux based system. The load averages are not normalized for the number of CPUs in a system, so a load average of 1 means a single CPU system is loaded all the time while on a 4 CPU system it means it was idle 75% of the time.
Overview
Currently the base classe `virt.driver.ComputeDriver` defines a method "get_host_uptime". This method ask the driver to call the command uptime but does not define a correct output format.
libvirt
get_host_uptime: 13:37:30 up 7 days, 4:29, 19 users, load average: 0.04, 0.04, 0.0
vmware
get_host_uptime: Please refer to {HOST_IP} for the uptime
xenapi
get_host_uptime: 13:37:30 up 7 days, 4:29, 19 users, load average: 0.04, 0.04, 0.0
Proposal
The proposal is to have the drivers returns the following information in a dictionary. The load average will be in a tuple of the 1, 5 and 15 minutes based system load averages normalized by the number of CPUs in the system. So a load average of 1 means the system is loaded all the time even if there is 1 or n CPUs .
{
"up": 5.22,
"users": 3,
"loadavg": (0.2, 0.55, 0.01)
}
Implementation Details
An additional method `get_host_loadavg` will be added to `virt.driver.ComputeDriver`. This method will returns a tuple of the last 1, 5, and 15minutes of the system load average normalized by the number of CPUs by invoking the standard command `uptime`
