PerformanceCounterConfiguration.SampleRate Property

Gets or sets the rate at which to sample the performance counter, rounded up to the nearest second.

Namespace:   Microsoft.WindowsAzure.Diagnostics
Assembly:  Microsoft.WindowsAzure.Diagnostics (in Microsoft.WindowsAzure.Diagnostics.dll)

Syntax

public TimeSpan SampleRate { get; set; }

public:
property TimeSpan SampleRate {
    TimeSpan get();
    void set(TimeSpan value);
}

member SampleRate : TimeSpan with get, set

Public Property SampleRate As TimeSpan

Property Value

Type: System.TimeSpan

Type: System.TimeSpan

Returns TimeSpan.

Remarks

The SampleRate property specifies the frequency for sampling performance counter data. Note that more frequent sampling may incur additional storage costs when the data is transferred to persistent storage at the specified interval.

Performance counters will be transferred to the WADPerformanceCounters table in persistent storage at the specified interval.

Example

The following code snippet demonstrates how to use PerformanceCounterConfiguration in the context of remotely changing the diagnostic monitor configuration for each instance of a specific role. This example creates two new PerformanceCounterConfiguration objects, specifies the performance counter and sample rate, gets a RoleInstanceDiagnosticManager object for each instance, and changes the configuration of each role instance using a DiagnosticMonitorConfiguration object.

// Get the connection string. It's recommended that you store the connection string in your web.config or app.config file.
// Use the ConfigurationManager type to retrieve your storage connection string.  You can find the account name and key in
// the Windows Azure Management Portal (https://manage.windowsazure.com).
//string connectionString = "DefaultEndpointsProtocol=https;AccountName=<AccountName>;AccountKey=<AccountKey>";
string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["StorageConnectionString"].ConnectionString;

// The deployment ID and role name for your application can be obtained from the 
// Windows Azure Management Portal (https://manage.windowsazure.com).  
// See your appliation dashboard under Cloud Services.
string deploymentID = "e2ab8b6667644666ba627bdf6f5e4daa";
string roleName = "WebRole1";

// Get the DeploymentDiagnosticManager object for your deployment.
DeploymentDiagnosticManager diagManager = new DeploymentDiagnosticManager(connectionString, deploymentID);

// Get the RoleInstanceDiagnosticManager objects for each instance of your role.
IEnumerable<RoleInstanceDiagnosticManager> instanceManagers = diagManager.GetRoleInstanceDiagnosticManagersForRole(roleName);

// Use 45 seconds for the performance counter sample rate.
TimeSpan perfSampleRate = TimeSpan.FromSeconds(45.0);

// Add a performance counter for processor time.
PerformanceCounterConfiguration pccCPU = new PerformanceCounterConfiguration();
pccCPU.CounterSpecifier = @"\Processor(_Total)\% Processor Time";
pccCPU.SampleRate = perfSampleRate;

// Add a performance counter for available memory.
PerformanceCounterConfiguration pccMemory = new PerformanceCounterConfiguration();
pccMemory.CounterSpecifier = @"\Memory\Available Mbytes";
pccMemory.SampleRate = perfSampleRate;

// Iterate through the role instances and update the configuration.
foreach (RoleInstanceDiagnosticManager roleInstance in instanceManagers)
{
   DiagnosticMonitorConfiguration currentConfiguration = roleInstance.GetCurrentConfiguration();

   currentConfiguration.PerformanceCounters.DataSources.Add(pccCPU);
   currentConfiguration.PerformanceCounters.DataSources.Add(pccMemory);

   roleInstance.SetCurrentConfiguration(currentConfiguration);
}

See Also

PerformanceCounterConfiguration Class
Microsoft.WindowsAzure.Diagnostics Namespace

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