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Performance Metrics for IIS Servers

Analyze the resource usage of sites, apps, and application pools in IIS servers and avoid server problems proactively with detailed, custom reports. The IIS monitor uses the Site24x7 Windows agent for monitoring. Install the Windows agent and get your IIS servers auto-discovered.

Once the IIS server monitor is successfully added to your Site24x7 account:

Interpret IIS performance metrics

Microsoft IIS Server Details: Gives basic details on the IIS server configured along with the top five pools based on traffic, network usage, Common Language Runtime (CLR) exception, and memory.

Sites: Tells the status of a site with the bindings enabled.

Applications: Lists the active applications as well as their cache and session details.

Application Pools: Shows information on the active application pools, CLR memory, and thread data.

Microsoft IIS Server Details

Parameters Description
Microsoft IIS Server Details Gives the host name, IP address, version, and platform of the IIS server
Network Statistics The total bytes of all requests received and sent to the client
Requests Stats A graphical view of the current and queued requests 
Top App Pools by Exceptions The top app pools based on the number of CLR exceptions thrown per second. The higher this rate, the lower the performance.
Top App Pools by Memory Usage (Working Set) The top app pools based on shared and physical memory 
Top Apps by Traffic The top app pools based on the traffic 
Top Apps by Network usage The top app pools based on the network usage 
Connection Statistics
Total Connection Attempts The total number of connection attempts
Total Logon Attempts The total number of login attempts
Current Connections The total number of active connections
User Statistics
Current Anonymous Users The total number of active anonymous users
Current NonAnonymous Users The total number of active non-anonymous users
Cache Memory Usage
Current File Cache Memory Usage The memory space occupied by the web service cache
Output Cache Current Memory Usage The memory space currently used by the output cache
Cache Hits
File Cache Hits % The percentage of successful requests handled by the cache from the total number of requests handled by the server
Kernel: URI Cache Hits % The percentage of Kernel-mode URI cache hits from the total number of requests handled by the server
Metadata Cache Hits % The percentage of metadata cache hits from the total number of requests handled by the server
Output Cache Current Hits % The percentage of output cache hits from the total number of requests handled by the server
URI Cache Hits % The percentage of user-mode URI cache hits from the total number of requests handled by the server
ASP.NET Requests
Request Execution Time The average time taken to successfully process a request
Request Wait Time The average time taken to start processing a request
Requests Rejected The total number of rejected requests

Sites 

Parameters Description 
Site Name  The name of the site
Binding  The bindings enabled in the site
Status The status of the site (Up or Down) 
Action Choose to be notified when a particular site is Down, set thresholds for Binding Address and associate automations to be executed when the threshold is breached
Current Connections The number of active connections accessing the site

Applications

Click Discover Applications to automatically add the applications in your IIS server for monitoring.

Parameters Description
Name The name of the application
Pool Name The name of the application pool corresponding to that application 
Site Name The name of the site 
Protocol Enabled transfer protocols (HTTP, HTTPS, etc)
Path The path of the application
Status The status of the application (Up, Idle, or Down)
Enable APM Insight Get deeper visibility into your application code by enabling our APM Insight monitoring capabilities 
Active Application Details: 
Name The name of the application 
Requests/sec Requests per second
Total Failed Requests The total number of failed requests which includes Request Timed Out (#500), Request Not Found (#404/#414), Request Not Authorized (#401) and Request Rejects (#503)
Queued Requests The number of requests waiting to be processed
Total Bytes Received (KB) The total bytes of all requests received
Total Bytes Sent (KB) The total bytes of response sent to the client
Concurrent Requests The maximum number of concurrent requests that are being processed by the application. A low number signifies effective usage of CPU.
Application Request Details:
Name The name of the application 
Total No of Requests  The total number of requests in the application 
Request Success  The number of requests that succeeded during the sample period 
Request Timed Out (500)   The number of requests that timed out
Request Not Found (404)  The number of requests for resources that were not found 
Request Not Authorized (401) The number of requests failed due to unauthorized access
Request Rejected (503) The number of rejected requests due to the request queue being full
Requests Disconnected The number of disconnected requests due to communication failure
Anonymous Request The number of requests that use anonymous authentication
Session Details:
Name The name of the application
Active Session The number of active (in-process) sessions
SQL Connection The total number of (out-of-proc) sessions, that uses SQL Server for storing sessions
State Connection The total number of (out-of-proc) sessions, that uses ASP.NET State Service for storing sessions
Connection Timeout The number of time out (in-proc) sessions
Cache Details:
Name The name of the application
Total Entries The total number of entries in the cache
API Hit Ratio (%) The cache hit-to-miss ratio when accessed through the external cache APIs 
Output Hits Ratio (%) The percentage of total requests serviced from the output cache
Memory Limit (%) Whenever the memory percentage limit hits 100, the cache is trimmed
Turnover Rate/sec The number of additions to and removals from the cache per second. Higher turnover rate can indicate inefficient usage of cache.

Application Pools

Parameters Description
Thread Statistics The thread count for each active application pool running on that server
Pool Name The name of the application pool
Runtime The .NET runtime version of the app pool
Max Processes The maximum number of worker processes for this app pool. The higher this value, the higher the reliability, but the poorer the memory and CPU usage
Status Indicates us if the app pool has started or stopped 
Active Application Pools Details:
Pool Name The name of the application pool
Processor Time The percentage of time all threads in the current process spend using the processors
IO Operations/sec I/O operations per second
Thread Count The number of threads during sampling
Private/Virtual Memory (MB) The size of the working set, in MB, that is used for that worker process only and not shareable by other processes
Private Bytes (MB) The current size, in MB, of the committed memory owned by this process. Memory leaks are identified by a consistent and prolonged increase in Private Bytes. This is the best performance counter for detecting memory leaks
Shared/Physical Memory (MB) The current size, in MB, of the working set of this process
Common Language Runtime (CLR) Data: 
Pool Name The name of the application pool
Loader Heap The number of bytes committed by the class loader across all AppDomains. If the counter doesn't reach a steady state, it may point to a memory leak
Assemblies The total number of assemblies loaded since the application started
App Domains The peak number of application domains loaded since the application started
Exceptions/sec The number of CLR exceptions thrown per second. The higher this rate, the lower the performance
Common Language Runtime (CLR) Memory Data: 
Pool Name The name of the application pool
Garbage Collection Time (%) The percentage of time spent performing the last garbage collection
Total Heap (MB) The sum of the large object heap and the generation 1 and 2 heaps
Gen 0 Heap (MB) The size (in megabytes) of the Gen 0 heap
Gen 1 Heap (MB) The size (in megabytes) of the Gen 1 heap
Gen 2 Heap (MB) The size (in megabytes) of the Gen 2 heap
Large Object Heap (MB) The size (in megabytes) of the large object heap
Common Language Runtime (CLR) Thread Data: 
Pool Name The name of the application pool
Physical Threads The number of native operating system threads created and owned by CLR
Logical Threads The current managed thread objects in the application
Queued Threads The total number of threads that are currently waiting to acquire a managed lock

Performance reports for IIS

Log in to Site24x7 and go to Reports > Microsoft IIS Server. The following reports are available for IIS monitoring:

  • Availability Summary Report
  • Busy Hours Report
  • Health Trend Report
  • Performance Report
  • IIS Sites Report
  • IIS App Report
  • IIS App Pools Report
  • Top N Microsoft IIS servers by network traffic

Learn more

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