Re: troubleshooting tools - IIS Crash/Hang agent

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From: WenJun Zhang[MSFT] (v-wzhang_at_online.microsoft.com)
Date: 03/02/04 

Date: Tue, 02 Mar 2004 06:53:47 GMT

1. Will is leave IIS running in the case of a hang situation?
(Experiments on my test box look like this is true -- IIS continues
after the log information is created -- which is what I need.)

Yes, the agent self doesn't perform any actions except write a log,
it will not kill any hang instances.

2. Will activating this ISAPI filter would have a
noticable/significant impact on performance? (This is for a shared
hosting situation with many virtual servers on a box.)

As I know, it only occupies little resource and will not affect
performance(without writting logs). I perfromed a very simple test:
compare the time-taken column of IIS log records for a single ASP
page, in the cases of with IISCHAgent filter loaded and without
IISCHAgent filter loaded, the results:

Crash Agent enabled:
4467
4567
4436

No Agent:
4767
4446
4527

Hang Agent enabled:
5008
4927
4557

At least, there isn't any obvious difference, all of the records are
in the reasonable range. So I think the filter's cost can be ignored
when the server is working normally.

Please update here if you have further issues. You are always welcome.
Best regards,

WenJun Zhang
Microsoft Online Support
This posting is provided "AS IS" with no warranties, and confers no
rights.
Get Secure! - www.microsoft.com/security

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