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:

View performance metrics for IIS monitors. Log in to Site24x7 and go to Server > Microsoft IIS Server > click the monitor.
Add a Threshold and Availability profile to declare a specific resource as Critical, Down, or Trouble.
Analyze trends and identify performance issues with exclusive performance reports.
View key metrics in a single glance with the inventory and health dashboards, or create your own.
Automate the start and stop of application pools and sites using IT Automation. Learn more.

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.

Note

Learn more about how to customize the way you monitor applications in an IIS server

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 allowed to service requests for the application pool. If the value is greater than 1: The application pool is a "Web Garden." In a Web Garden, the requests are distributed across multiple worker processes. If one worker process fails, another worker process will continue to process the request. If the value is 0: In a NUMA-aware system, IIS will automatically start as many worker processes as there are NUMA nodes for optimal performance.
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