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Monday, 14 May 2012

Performance Counter Setup on Windows Azure

Posted on 07:03 by Unknown
Cand avem o aplicatie in cloud avem nevoie de a monitoriza diferiti parametrii. Acest lucru il facem asa cum il facem si pe un server normal folosindune de performance counter.
Intrebarea ar putea sa fie usor diferita: Ce facem cu aceste valori odata ce le avem?
Daca intram remote pe masina, puten sa ne folosim perfmon.exe pentru a monitoriza toti acest parametrii. Dar daca vrem mai mult de atata, daca vrem ca aceste valori sa le putem accesa remote sau sa le persistam in Azure Storage.
In ajutor ne-a venit in ajutor Microsoft si ne-a oferit DiagnosticMonitor pentru Azure. Acesta poate sa fie configurat destul de usor in momentul in care aplicatia porneste si ne va permite sa scriem orice valoare in Azure Tables. In exemplul de mai jos o sa prezint cum se configureaza pentru a putea vedea load-ul la procesor:
var config = DiagnosticMonitor.GetDefaultInitialConfiguration();
config.PerformanceCounters.ScheduledTransferPeriod = TimeSpan.FromMinutes(30);
config.PerformanceCounters.DataSources.Add
new PerformanceCounterConfiguration() {
CounterSpecifier = @"\Processor(_Total)\% Processor Time",
SampleRate = TimeSpan.FromSeconds(30)
};
Deoarece fiecare tranzactie se contorizeaza la sfarsit de luna, am setat ca flush-ul la date sa se faca odata la 30 de minute. Odata ce am facut aceasta configurare ajunge sa pornim diagnosticarea pentru noua configuratie:
DiagnosticMonitor.Start("Microsoft.WindowsAzure.Plugins.Diagnostics.ConnectionString", config);
Am vazut ca la unele persoane nu este foarte clar ce valoare reprezinta "\Processor(_Total)\% Processor Time". Aceasta reprezinta CPU usage in momentul in care s-a facut requestul. Valoare este media la CPU usage pentru toate procesoarele masinii noastre.
Aceasta setare este nevoie sa o adaugati in entry point-ul aplicatiei voastre din cloud. Clasa care reprezinta entry-point-ul pentru o aplicatie in cloud are ca si clasa de baza RoleEntryPoint.
Mai jos gasiti o implementare cap coada a unui performance counter.
public class WebRole : RoleEntryPoint
{
public override bool OnStart()
{
var config = DiagnosticMonitor.GetDefaultInitialConfiguration();
config.OverallQuotaInMB = 4080;
config.ConfigurationChangePollInterval = TimeSpan.FromHours(1);
config.PerformanceCounters.BufferQuotaInMB = 128;
config.PerformanceCounters.ScheduledTransferPeriod = TimeSpan.FromSeconds(60);

config.PerformanceCounters.DataSources.
Add(new PerformanceCounterConfiguration
{
CounterSpecifier = @"\Processor(_Total)\% Processor Time",
SampleRate = TimeSpan.FromSeconds(30)
});

DiagnosticMonitor.Start("Microsoft.WindowsAzure.Plugins.Diagnostics.ConnectionString", config);

return true;
}
}
Odata ce am facut aceste configurari si am facut un deploy (sau am rulat aplicatia local) o sa puteti observa ca apare o noua table in Windows Azure Tables. Aceasta poata numele de "WADPerformanceCountersTable" si o sa contina toate valorile de la toti performance counters pe care ii monitorizati. In acest tabel o sa gasiti toate datele despre performance counters pe care voi ii monitorizati.
Pentru a putea vizualiza aceste valori mai usor, va recomand sa folositi Cloud Monitoring Studio. Este un tool gratis de pe codeplex care iti permite sa vizualizezi toate datele sub forma unui grafic.
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