[Engine-devel] Updates in VdsUpdateRuntimeInfo

[Itamar Heim]

On 06/11/2013 03:26 PM, Liran Zelkha wrote:
> Hi all,
>
> I'm checking performance for VdsUpdateRunTimeInfo.
> Naturally, much of the performance surrounds database activity (getVmsRunningOnVds queries, updateDeviceRuntimeInfo, updateVmDynamic)
>
> Few questions:
> 1. I have implemented batch updates for procedure UpdateVmDeviceRuntimeInfo for improved performance.
> 2. Seems like the only parameters UpdateVmDeviceRuntimeInfo is getting are vm_id,vm_device_id,address and alias. Are those rapidly changing, or will it be beneficial to implement caching on those updates (to ensure not-required updates do not travel to the database).

slowly changing, but how will you cover all flows changing these devices 
to invalidate the cache (iiuc, this table is modified by engine when 
adding devices to a VM as well?)

> 3. Any additional known performance problems you know of in regards to this class?
>
> Thanks...
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