[vbox-dev] Setting IPerformance interval using webservice

Aleksey Ilyushin Aleksey.Ilyushin at Sun.COM
Mon Feb 15 00:58:05 PST 2010

Hi Joe,

Could you post the code fragment that does it? It would be much easier  
to understand what is wrong. Btw do you ever let go of the  
IPerformance handle? Because if you do the process on the server end  
will die shortly and all the settings will be lost. The settings are  
not persistent.


On Feb 9, 2010, at 5:12 PM, Joseph Smith wrote:

> Hi,
> I've been trying to set the IPerformance collector interval via the  
> webservice API and somehow have not been able to do so.  No  
> exceptions are thrown and in fact, the responses are all as  
> documented ... but still unable to set the interval.
> As so often recommended, I looked closely at the way VBoxManage does  
> it ... and I'm doing the same thing (well ... it sure seems like I  
> am).
> By setting the interval and samples using VBoxManage, I can retrieve  
> all the expected performance data using the webservice and they  
> report exactly the same values VBoxManage does.
> The steps I am taking are:
> 1) Get the IPerformance handle from IVirtualBox::performanceCollector
> 2) Determine the statistics I want to collect (actually, I use the  
> metricNames method on the IPerformance Handle object which retreives  
> all the supported names)
> 3) Set the metrics using the IPerformance handle from step 1:   
> Handle->setupMetrics.  I set the same period and count I use when  
> doing this via VBoxManage.  I also pass the objects for the host and  
> various selected VMs
> 4) I call enable metrics with the list of metrics I want to collect  
> and the same list of objects for the host and selected VMs.
> 5) I then periodically call the queryMetricsData method of the  
> performance handle  with the same list of metrics and objects for  
> the selected VMs.
> Unfortunately ... because it appears the period and count are not  
> being set ... No data is ever returned.
> NOTE: Leaving this running (meaning not restarting) .. and then  
> going to the comand-line and using VBoxManage to set the period and  
> count for the host and VMs of choice ... I am immediately able to  
> get data and the data matches exactly the same reported by VBoxManage.
> So ... I'm sure I must be missing something somewhere ... but I sure  
> can't see it ...
> Any suggestions or ideas?
> Thanks,
> Joe
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