VMware vSphere SDKs and Tools 6.7

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PerformanceManager Objects and Methods

PerformanceManager
 provides methods for obtaining statistical data about various aspects of system performance, as generated and maintained by the performance providers. It also defines historical performance intervals and it identifies the set of performance counters that you can use to obtain performance data. The following table shows the
PerformanceManager
 properties.
Property
Description
description
Composite object that includes information about the types of counters (
counterType
) and statistics (
statsType
) available on the system.
historicalInterval
Array of system-defined performance intervals (
PerfInterval
 data objects). Each object defines the interval between rollup events, the collection level, and the time period that the data is stored on the system.
  • For an ESXi system, the array contains a single performance interval. You cannot modify the ESXi performance interval.
  • For vCenter Server systems, the
    PerfInterval
     objects control how ESXi performance data are rolled up and stored in the database. You can modify some of the
    PerfInterval
     properties on a vCenter Server.
perfCounter
Array of
PerfCounterInfo
 data objects. The array identifies all of the performance counters known to the vCenter Server at the time a client accesses the array. The set of counters may change as ESXi hosts are added or removed from vCenter management. Each
PerfCounterInfo
 object contains metadata associated with a performance counter.
The
PerformanceManager
 methods allow you to retrieve performance statistics and to retrieve metadata that defines the statistics. The following table classifies the methods and describes their purposes.
Method Type
Method
Purpose
Performance data availability
QueryAvailablePerfMetric
Returns
PerfMetricId
 objects which identify the counter data available on the specified entity. For example, a virtual machine provides the memory counter
granted
, which indicates the amount of physical memory that is mapped for the virtual machine. The
PerfMetricId
 object for the
mem.granted.average
 counter specifies the system-defined counter ID. Since this is a memory counter, the
PerfMetricId.instance
 property is empty.
Performance data retrieval
QueryPerf
Returns statistics for a specific list of managed entities that provide performance data.
QueryPerfComposite
Returns statistics for a host and its virtual machines. This method accepts the
refreshRate
 for current statistics or the
intervalId
 of one of the historical intervals as a parameter. Supported for the
HostSystem
 managed entity only.
Performance counter metadata retrieval
QueryPerfCounter
Returns
PerfCounterInfo
 data objects for the specified list of counter IDs.
QueryPerfCounterByLevel
Returns
PerfCounterInfo
 data objects for the specified collection level.
Performance provider information
QueryPerfProviderSummary
Returns the
PerfProviderSummary
 data object for the specified managed object.
Collection parameters
ResetCounterLevelMapping
Restores a set of performance counters to their default collection levels.
UpdateCounterLevelMapping
Changes the collection level for a set of performance counters.
UpdatePerfInterval
Modifies the system-defined performance intervals.

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