[Mono-aspnet-list] CPU usage of mod-mono

[Poiros]

I have been using Apache with mod-mono to support ASP.NET applications on an
embedded device for a while now and I have noticed that the mod_mono process
still uses some CPU time after a request has been completed. To show this, I
have created this simple WebService:


[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class Service1 : System.Web.Services.WebService
{
	[WebMethod]
	public bool Sleep()
	{
		System.Threading.Thread.Sleep(60000);
		return true;
	}
}

Then, I created a simple console application on windows that calls the Sleep
method of the WebService. While the console application makes the call, I
get this output from the top command on the device:

PID    PPID  USER   STAT   VSZ   %MEM %CPU COMMAND
20308     1 daemon   S    45584  22%   6% /usr/bin/mono
/usr/lib/mono/4.0/mod-mono-server4.exe --filename /tmp/mod_mono_server_qqq
--applications /qqq:/usr/htdocs/qqq --nonstop 

When the request has returned successfully, I can still see some CPU being
used by the mod-mono process:

PID    PPID  USER   STAT   VSZ   %MEM %CPU COMMAND
20308     1 daemon   S    46908  23%   6% /usr/bin/mono
/usr/lib/mono/4.0/mod-mono-server4.exe --filename /tmp/mod_mono_server_qqq
--applications /qqq:/usr/htdocs/qqq --nonstop 


I was wondering if it was xsp or mod-mono that was the cause of the CPU
usage. So I extented this test by using xsp4:

While running:    

PID    PPID  USER   STAT   VSZ   %MEM %CPU COMMAND
19074  5596  root     S    45624  22%   2% /usr/bin/mono
/usr/lib/mono/4.0/xsp4.exe

After the request has returned: 

PID    PPID  USER   STAT   VSZ   %MEM %CPU COMMAND
19074  5596  root     S    45956  23%   2% /usr/bin/mono
/usr/lib/mono/4.0/xsp4.exe 

I am wondering why the mod-mono process and xsp4 are using the CPU when the
request has been completed. Also, I have noticed that the mod-mono process
is doing some extra processing compared to xsp4. why??

Any help would be greatly appreciated! 

Erik Poirier, sw dev


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