Internet Information Services
Microsoft web server software.
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my maximum worker processes always set to 1
About the IIS site request queue length?
aspx
6
Reputation points
OS: Windows Server 2016 Standard
IIS: Version 10.0.14393.0
Web Sites: WebIISQueueTest .NetFramework4.5 Asp.net mvc
Question 1: By which performance counter does the site's request queue length be monitored?
Question 2: The request queue length is set but can be exceeded, why not return 503.
Performance counters HTTP Service Request Queues (CurrentQueueSize): The request count in the IIS queue on windows server 2016
The CurrentQueueSize property always has a zero value , why ?
application pool img: https://i.stack.imgur.com/k8tsS.png
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aspx 6 Reputation points
2021-12-28T04:05:24.897+00:00 -
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(80, 82%, 17%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EBZ%3C/text%3E%3C/svg%3E)
Bruce Zhang-MSFT 3,751 Reputation points2021-12-28T07:33:23.637+00:00 Hi @aspx ,
Yes, it is set to 1 by default. But even one work process also has multiple threads to handle requests at same time.
ArrivalRate indicates the rate at which requests are arriving in the request queue of this application pool. If the value is too large, maybe there's a request overload on an application pool. But according to your screenshoot, requests can be handled immediately when arrivalRate increase. The value is not always large.
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aspx 6 Reputation points
2021-12-29T03:35:56.69+00:00 UP........
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Bruce Zhang-MSFT 3,751 Reputation points
2021-12-29T06:44:54.593+00:00 Hi @aspx ,
I can't understand what you mean. I have explained ArrivalRate in the comment.
If the value is too large, maybe there's a request overload on an application pool. But according to your screenshoot, requests can be handled immediately when arrivalRate increase. The value is not always large.
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aspx 6 Reputation points
2021-12-29T07:04:03.2+00:00 Back to the original question
The site's request queue length which performance counter monitors? ?
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Bruce Zhang-MSFT 3,751 Reputation points
2021-12-29T08:24:16.19+00:00 Hi @aspx ,
Microsoft has performance counter to monitor queue and the screenshoots indicate that you have used it.
There is no line of CurrentQueueSize in the chart indicates that no request that needs to be queued. It does not mean that it cannot monitor queue.
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aspx 6 Reputation points
2021-12-29T10:14:52.543+00:00 The same number of concurrent client requests and same IIS configuration
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Config\machine.config , <processModel autoConfig="true"/>
C:\Windows\System32\inetsrv\config\applicationHost.config , <serverRuntime appConcurrentRequestLimit="5000" />win10-iis ver: 10.0.19041.1415 , CurrentQueueSize works. RejectedRequest works
win2016-is ver: 10.0.14393.0 , CurrentQueueSize doesn't work. RejectedRequest works
win2008-is ver: 7.5.7600.16385 , CurrentQueueSize doesn't work . RejectedRequest worksBUG??
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aspx 6 Reputation points
2021-12-29T10:26:42.857+00:00 The same number of concurrent client requests and same IIS configuration
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Config\machine.config , <processModel autoConfig="true"/>
C:\Windows\System32\inetsrv\config\applicationHost.config , <serverRuntime appConcurrentRequestLimit="5000" />win10-iis ver: 10.0.19041.1415 , CurrentQueueSize works. RejectedRequest works
win2016-iis ver: 10.0.14393.0 , CurrentQueueSize doesn't work. RejectedRequest works
win2008-iis ver: 7.5.7600.16385 , CurrentQueueSize doesn't work . RejectedRequest worksBUG??
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Bruce Zhang-MSFT 3,751 Reputation points
2021-12-30T02:08:42.957+00:00 Hi @aspx ,
What do you mean CurrentQueueSize doesn't work? No value or any other thing? No value means there's no requests in the queue.
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aspx 6 Reputation points
2021-12-30T02:46:39.693+00:00 RejectedRequest has value, client receive http status 503 or 200 from server,netstat can see that the many connection has been established
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Bruce Zhang-MSFT 3,751 Reputation points
2021-12-30T06:23:21.297+00:00 Hi @aspx ,
Those 503 requests are RejectedRequest. CurrentQueueSize doesn't mean the request that has been connected, but requests are still waiting for connect in the queue.
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aspx 6 Reputation points
2021-12-30T06:48:15.08+00:00 The key question is : "still waiting for connect in the queue" ,the queue was full, so rejected, How do I monitor it by performance counter????
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aspx 6 Reputation points
2021-12-30T07:29:09.613+00:00 The key question is : "still waiting for connect in the queue" ,the queue was full, so rejected, How do I monitor it by performance counter????
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Bruce Zhang-MSFT 3,751 Reputation points
2022-01-04T06:04:08.157+00:00 Hi @aspx ,
The question is how you know there are requests still waiting in the queue? I cannot see any line of rejected requests in the image.
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aspx 6 Reputation points
2022-01-04T02:36:25.46+00:00 please help answer, up......
