In ASP.NET:
- How can I tell when the ASP.NET worker process last restarted?
- In ASP.NET, how can I tell when the app domain last recycled?
Answers:
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Method 1
For the worker process, you can programmatically read Process -> Elapsed Time from the corresponding perf. counter (1) or directly from the System.Diagnostics.Process namespace; for the AppDomain, you can set an application-level variable at start-up to serve as your baseline and measure against that manually.
Scott Mitchell actually has a couple of good posts on this that are still relevant 8 years later, believe it or not (2). Running on Cassini (Vista, VS 2008), I’m seeing an accurate system up-time with:
TimeSpan.FromMilliseconds(Environment.TickCount)
…and accurate Process/AppDomain up-times with these:
foreach (Process p in Process.GetProcessesByName("WebDev.WebServer"))
{
Response.Write(DateTime.Now.Subtract(p.StartTime).ToString() + "<br/>");
}
Response.Write(DateTime.Now.Subtract((DateTime)Application["StartTime"]).ToString());
I’m also able to obtain the correct PerfomanceCounter, but can’t seem to read the correct value (always zero, under my setup):
Response.Write(new PerformanceCounter("Process", "Elapsed Time", "WebDev.WebServer").NextValue() + "<br/>");
Scott’s articles are definitely worth a read – there’s a wealth of info in ProcessInfo and ProcessModelInfo (eg. ProcessModelInfo.GetHistory), but unfortunately it’s not available on Cassini:
Process metrics are available only
when the ASP.NET process model is
enabled. When running on versions of
IIS 6 or newer in worker process
isolation mode, this feature is not
supported.
UPDATE:
great explanation of how to read the counter correctly to avoid the zero on NextValue(): Link
HTH
(1) https://serverfault.com/questions/90927/lifetime-of-iis-worker-process-or-appdomai
(2) http://www.4guysfromrolla.com/articles/041002-1.aspx
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