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Application Pool recycling hangs

P: n/a
Hi,

We are having a few problems with ASP.Net pages hanging during load when an
Application Pool is recycled. To test this we have setup the following
ASP.net page which refreshes every 2 seconds:

<%@ Page language="c#" %>
<%@ Import Namespace="System" %>
<%@ Import Namespace="System.IO" %>

<script runat="server">
void Page_Load(Object sender, System.EventArgs e)
{
Label1.Text = DateTime.Now.ToString();
StreamWriter SW;
SW=File.AppendText("c:/inetpub/wwwroot/log1.txt");
SW.WriteLine(DateTime.Now);
SW.Close();
}
</script>

<html>
<head>
<title>Cache Test</title>
<meta http-equiv="refresh" content="2">
</head>
<body>

<form runat="server">
<asp:label id="Label1" runat="server" />
</form>
</body>
</html>

I've also set the Application Pool that the site runs under in IIS 6.0 to
Recycle every 1 minute (and set the Idle Timeout on the Performance tab to 1
minute).

The page seems to refresh ok for a while in the browser each 2 seconds but
sometimes when the Application Pool recycles the page load hangs for over
one minute and will eventually start going again. On another machine however
it runs continuously without hanging.

Does anyone have an idea as to what the hanging might be caused by?

Thanks - Wayne.
Apr 5 '06 #1
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6 Replies


P: n/a
Application Pool recycling is overlapping by default.

If your app shares resources, make sure it works with this potential
"concurrency".

--
//David
IIS
http://blogs.msdn.com/David.Wang
This posting is provided "AS IS" with no warranties, and confers no rights.
//

"Wayne Smith" <wa**********@hotmail.com> wrote in message
news:eZ*************@TK2MSFTNGP05.phx.gbl...
Hi,

We are having a few problems with ASP.Net pages hanging during load when
an Application Pool is recycled. To test this we have setup the following
ASP.net page which refreshes every 2 seconds:

<%@ Page language="c#" %>
<%@ Import Namespace="System" %>
<%@ Import Namespace="System.IO" %>

<script runat="server">
void Page_Load(Object sender, System.EventArgs e)
{
Label1.Text = DateTime.Now.ToString();
StreamWriter SW;
SW=File.AppendText("c:/inetpub/wwwroot/log1.txt");
SW.WriteLine(DateTime.Now);
SW.Close();
}
</script>

<html>
<head>
<title>Cache Test</title>
<meta http-equiv="refresh" content="2">
</head>
<body>

<form runat="server">
<asp:label id="Label1" runat="server" />
</form>
</body>
</html>

I've also set the Application Pool that the site runs under in IIS 6.0 to
Recycle every 1 minute (and set the Idle Timeout on the Performance tab to
1 minute).

The page seems to refresh ok for a while in the browser each 2 seconds but
sometimes when the Application Pool recycles the page load hangs for over
one minute and will eventually start going again. On another machine
however it runs continuously without hanging.

Does anyone have an idea as to what the hanging might be caused by?

Thanks - Wayne.

Apr 5 '06 #2

P: n/a
Even with the application pool set to recycle every 1900 minutes we were
getting this issue of the page load hanging....
"David Wang [Msft]" <so*****@online.microsoft.com> wrote in message
news:uM**************@TK2MSFTNGP05.phx.gbl...
Application Pool recycling is overlapping by default.

If your app shares resources, make sure it works with this potential
"concurrency".

--
//David
IIS
http://blogs.msdn.com/David.Wang
This posting is provided "AS IS" with no warranties, and confers no
rights.
//

"Wayne Smith" <wa**********@hotmail.com> wrote in message
news:eZ*************@TK2MSFTNGP05.phx.gbl...
Hi,

We are having a few problems with ASP.Net pages hanging during load when
an Application Pool is recycled. To test this we have setup the following
ASP.net page which refreshes every 2 seconds:

<%@ Page language="c#" %>
<%@ Import Namespace="System" %>
<%@ Import Namespace="System.IO" %>

<script runat="server">
void Page_Load(Object sender, System.EventArgs e)
{
Label1.Text = DateTime.Now.ToString();
StreamWriter SW;
SW=File.AppendText("c:/inetpub/wwwroot/log1.txt");
SW.WriteLine(DateTime.Now);
SW.Close();
}
</script>

<html>
<head>
<title>Cache Test</title>
<meta http-equiv="refresh" content="2">
</head>
<body>

<form runat="server">
<asp:label id="Label1" runat="server" />
</form>
</body>
</html>

I've also set the Application Pool that the site runs under in IIS 6.0 to
Recycle every 1 minute (and set the Idle Timeout on the Performance tab
to 1 minute).

The page seems to refresh ok for a while in the browser each 2 seconds
but sometimes when the Application Pool recycles the page load hangs for
over one minute and will eventually start going again. On another machine
however it runs continuously without hanging.

Does anyone have an idea as to what the hanging might be caused by?

Thanks - Wayne.


Apr 5 '06 #3

P: n/a
Can you explain why changing recycling period will have any effect in your
scenario?
Remove the StreamWriter and File.AppendText() calls and see if it still
hangs.

If it stops hanging, you have a concurrency issue with the code you wrote.
One way to address this is to turn off overlapping recycle, where IIS waits
for the old process to terminate (and release its shared resource) before
starting the new process to execute (and re-use the shared resource).

--
//David
IIS
http://blogs.msdn.com/David.Wang
This posting is provided "AS IS" with no warranties, and confers no rights.
//

"Wayne Smith" <wa**********@hotmail.com> wrote in message
news:OF**************@TK2MSFTNGP03.phx.gbl...
Even with the application pool set to recycle every 1900 minutes we were
getting this issue of the page load hanging....
"David Wang [Msft]" <so*****@online.microsoft.com> wrote in message
news:uM**************@TK2MSFTNGP05.phx.gbl...
Application Pool recycling is overlapping by default.

If your app shares resources, make sure it works with this potential
"concurrency".

--
//David
IIS
http://blogs.msdn.com/David.Wang
This posting is provided "AS IS" with no warranties, and confers no
rights.
//

"Wayne Smith" <wa**********@hotmail.com> wrote in message
news:eZ*************@TK2MSFTNGP05.phx.gbl...
Hi,

We are having a few problems with ASP.Net pages hanging during load when
an Application Pool is recycled. To test this we have setup the
following ASP.net page which refreshes every 2 seconds:

<%@ Page language="c#" %>
<%@ Import Namespace="System" %>
<%@ Import Namespace="System.IO" %>

<script runat="server">
void Page_Load(Object sender, System.EventArgs e)
{
Label1.Text = DateTime.Now.ToString();
StreamWriter SW;
SW=File.AppendText("c:/inetpub/wwwroot/log1.txt");
SW.WriteLine(DateTime.Now);
SW.Close();
}
</script>

<html>
<head>
<title>Cache Test</title>
<meta http-equiv="refresh" content="2">
</head>
<body>

<form runat="server">
<asp:label id="Label1" runat="server" />
</form>
</body>
</html>

I've also set the Application Pool that the site runs under in IIS 6.0
to Recycle every 1 minute (and set the Idle Timeout on the Performance
tab to 1 minute).

The page seems to refresh ok for a while in the browser each 2 seconds
but sometimes when the Application Pool recycles the page load hangs for
over one minute and will eventually start going again. On another
machine however it runs continuously without hanging.

Does anyone have an idea as to what the hanging might be caused by?

Thanks - Wayne.




Apr 5 '06 #4

P: n/a
Hi David,

How do I turn off the overlapping recycle?

Thanks.
"David Wang [Msft]" <so*****@online.microsoft.com> wrote in message
news:%2****************@TK2MSFTNGP05.phx.gbl...
Can you explain why changing recycling period will have any effect in your
scenario?
Remove the StreamWriter and File.AppendText() calls and see if it still
hangs.

If it stops hanging, you have a concurrency issue with the code you wrote.
One way to address this is to turn off overlapping recycle, where IIS
waits
for the old process to terminate (and release its shared resource) before
starting the new process to execute (and re-use the shared resource).

--
//David
IIS
http://blogs.msdn.com/David.Wang
This posting is provided "AS IS" with no warranties, and confers no
rights.
//

"Wayne Smith" <wa**********@hotmail.com> wrote in message
news:OF**************@TK2MSFTNGP03.phx.gbl...
Even with the application pool set to recycle every 1900 minutes we were
getting this issue of the page load hanging....
"David Wang [Msft]" <so*****@online.microsoft.com> wrote in message
news:uM**************@TK2MSFTNGP05.phx.gbl...
Application Pool recycling is overlapping by default.

If your app shares resources, make sure it works with this potential
"concurrency".

--
//David
IIS
http://blogs.msdn.com/David.Wang
This posting is provided "AS IS" with no warranties, and confers no
rights.
//

"Wayne Smith" <wa**********@hotmail.com> wrote in message
news:eZ*************@TK2MSFTNGP05.phx.gbl...
Hi,

We are having a few problems with ASP.Net pages hanging during load
when
an Application Pool is recycled. To test this we have setup the
following ASP.net page which refreshes every 2 seconds:

<%@ Page language="c#" %>
<%@ Import Namespace="System" %>
<%@ Import Namespace="System.IO" %>

<script runat="server">
void Page_Load(Object sender, System.EventArgs e)
{
Label1.Text = DateTime.Now.ToString();
StreamWriter SW;
SW=File.AppendText("c:/inetpub/wwwroot/log1.txt");
SW.WriteLine(DateTime.Now);
SW.Close();
}
</script>

<html>
<head>
<title>Cache Test</title>
<meta http-equiv="refresh" content="2">
</head>
<body>

<form runat="server">
<asp:label id="Label1" runat="server" />
</form>
</body>
</html>

I've also set the Application Pool that the site runs under in IIS 6.0
to Recycle every 1 minute (and set the Idle Timeout on the Performance
tab to 1 minute).

The page seems to refresh ok for a while in the browser each 2 seconds
but sometimes when the Application Pool recycles the page load hangs
for
over one minute and will eventually start going again. On another
machine however it runs continuously without hanging.

Does anyone have an idea as to what the hanging might be caused by?

Thanks - Wayne.



Apr 6 '06 #5

P: n/a
Ok - i've found how to disable the overlapping recycle which I've done but
it still seems to hang. It didn't stop either when I removed the
StreamWriter and File.AppendText() calls.
"Wayne Smith" <wa**********@hotmail.com> wrote in message
news:e$**************@TK2MSFTNGP04.phx.gbl...
Hi David,

How do I turn off the overlapping recycle?

Thanks.
"David Wang [Msft]" <so*****@online.microsoft.com> wrote in message
news:%2****************@TK2MSFTNGP05.phx.gbl...
Can you explain why changing recycling period will have any effect in
your scenario?
Remove the StreamWriter and File.AppendText() calls and see if it still
hangs.

If it stops hanging, you have a concurrency issue with the code you
wrote.
One way to address this is to turn off overlapping recycle, where IIS
waits
for the old process to terminate (and release its shared resource) before
starting the new process to execute (and re-use the shared resource).

--
//David
IIS
http://blogs.msdn.com/David.Wang
This posting is provided "AS IS" with no warranties, and confers no
rights.
//

"Wayne Smith" <wa**********@hotmail.com> wrote in message
news:OF**************@TK2MSFTNGP03.phx.gbl...
Even with the application pool set to recycle every 1900 minutes we were
getting this issue of the page load hanging....
"David Wang [Msft]" <so*****@online.microsoft.com> wrote in message
news:uM**************@TK2MSFTNGP05.phx.gbl...
Application Pool recycling is overlapping by default.

If your app shares resources, make sure it works with this potential
"concurrency".

--
//David
IIS
http://blogs.msdn.com/David.Wang
This posting is provided "AS IS" with no warranties, and confers no
rights.
//

"Wayne Smith" <wa**********@hotmail.com> wrote in message
news:eZ*************@TK2MSFTNGP05.phx.gbl...
> Hi,
>
> We are having a few problems with ASP.Net pages hanging during load
> when
> an Application Pool is recycled. To test this we have setup the
> following ASP.net page which refreshes every 2 seconds:
>
> <%@ Page language="c#" %>
> <%@ Import Namespace="System" %>
> <%@ Import Namespace="System.IO" %>
>
> <script runat="server">
> void Page_Load(Object sender, System.EventArgs e)
> {
> Label1.Text = DateTime.Now.ToString();
> StreamWriter SW;
> SW=File.AppendText("c:/inetpub/wwwroot/log1.txt");
> SW.WriteLine(DateTime.Now);
> SW.Close();
> }
> </script>
>
> <html>
> <head>
> <title>Cache Test</title>
> <meta http-equiv="refresh" content="2">
> </head>
> <body>
>
> <form runat="server">
> <asp:label id="Label1" runat="server" />
> </form>
> </body>
> </html>
>
> I've also set the Application Pool that the site runs under in IIS 6.0
> to Recycle every 1 minute (and set the Idle Timeout on the Performance
> tab to 1 minute).
>
> The page seems to refresh ok for a while in the browser each 2 seconds
> but sometimes when the Application Pool recycles the page load hangs
> for
> over one minute and will eventually start going again. On another
> machine however it runs continuously without hanging.
>
> Does anyone have an idea as to what the hanging might be caused by?
>
> Thanks - Wayne.
>



Apr 6 '06 #6

P: n/a
To turn off overlapped recycling,
set the DisallowOverlappingRotation metabase property to true.

You will need to use the Metabase Explorer to do that.
It's in the IIS 6.0 Resource Kit.

Details :
http://support.microsoft.com/default...en-us;840671#8

Download:
http://www.microsoft.com/downloads/d...displaylang=en


Juan T. Llibre, asp.net MVP
aspnetfaq.com : http://www.aspnetfaq.com/
asp.net faq : http://asp.net.do/faq/
foros de asp.net, en español : http://asp.net.do/foros/
===================================
"Wayne Smith" <wa**********@hotmail.com> wrote in message
news:e$**************@TK2MSFTNGP04.phx.gbl...
Hi David,

How do I turn off the overlapping recycle?

Thanks.
"David Wang [Msft]" <so*****@online.microsoft.com> wrote in message
news:%2****************@TK2MSFTNGP05.phx.gbl...
Can you explain why changing recycling period will have any effect in your scenario?
Remove the StreamWriter and File.AppendText() calls and see if it still
hangs.

If it stops hanging, you have a concurrency issue with the code you wrote.
One way to address this is to turn off overlapping recycle, where IIS waits
for the old process to terminate (and release its shared resource) before
starting the new process to execute (and re-use the shared resource).

--
//David
IIS
http://blogs.msdn.com/David.Wang
This posting is provided "AS IS" with no warranties, and confers no rights.
//

"Wayne Smith" <wa**********@hotmail.com> wrote in message
news:OF**************@TK2MSFTNGP03.phx.gbl...
Even with the application pool set to recycle every 1900 minutes we were
getting this issue of the page load hanging....
"David Wang [Msft]" <so*****@online.microsoft.com> wrote in message
news:uM**************@TK2MSFTNGP05.phx.gbl...
Application Pool recycling is overlapping by default.

If your app shares resources, make sure it works with this potential
"concurrency".

--
//David
IIS
http://blogs.msdn.com/David.Wang
This posting is provided "AS IS" with no warranties, and confers no
rights.
//

"Wayne Smith" <wa**********@hotmail.com> wrote in message
news:eZ*************@TK2MSFTNGP05.phx.gbl...
> Hi,
>
> We are having a few problems with ASP.Net pages hanging during load when
> an Application Pool is recycled. To test this we have setup the
> following ASP.net page which refreshes every 2 seconds:
>
> <%@ Page language="c#" %>
> <%@ Import Namespace="System" %>
> <%@ Import Namespace="System.IO" %>
>
> <script runat="server">
> void Page_Load(Object sender, System.EventArgs e)
> {
> Label1.Text = DateTime.Now.ToString();
> StreamWriter SW;
> SW=File.AppendText("c:/inetpub/wwwroot/log1.txt");
> SW.WriteLine(DateTime.Now);
> SW.Close();
> }
> </script>
>
> <html>
> <head>
> <title>Cache Test</title>
> <meta http-equiv="refresh" content="2">
> </head>
> <body>
>
> <form runat="server">
> <asp:label id="Label1" runat="server" />
> </form>
> </body>
> </html>
>
> I've also set the Application Pool that the site runs under in IIS 6.0
> to Recycle every 1 minute (and set the Idle Timeout on the Performance
> tab to 1 minute).
>
> The page seems to refresh ok for a while in the browser each 2 seconds
> but sometimes when the Application Pool recycles the page load hangs for
> over one minute and will eventually start going again. On another
> machine however it runs continuously without hanging.
>
> Does anyone have an idea as to what the hanging might be caused by?
>
> Thanks - Wayne.
>



Apr 6 '06 #7

This discussion thread is closed

Replies have been disabled for this discussion.