Request Statistics
The Request Statistics section contains the following reports:
- Active Requests
- Active ColdFusion Threads
- Slowest Requests
- Slowest ColdFusion Threads
- Active Sessions
- Cumulative Server Usage
- Highest Hit Counts
- Template Cache Status
- Request Throttle Data
The Active Requests report lists all currently active requests that take longer to load than the request interval for reports specified in the Refresh Interval setting. Requests include browser requests, CFC HTTP requests, web services, gateways, and Flash remoting. You can view a list, a detailed view, or a graph of active requests. The detailed view includes the CFML stack trace, which you can use to find deadlocked requests and where a long running request is blocked. To see all request graphs in one view, click Chart. The graph indicates the number of requests that the server is currently processing and the number of requests that are awaiting allocation of an application server thread to begin execution. If the graph indicates that a large number of requests are queued, you might want to increase the size of the thread pool. Alternatively, if ColdFusion is deployed in a cluster, you may want to add a server instance for more efficient load balancing.
The Active ColdFusion Threads report lists all currently active threads. You can view a list, a detailed view, or a graph of active threads.
The Slowest Requests report lists the slowest requests. You can specify the threshold that determines whether a request appears on this page. The lower the threshold, the more requests appear on the list. Use the Report Size option to limit the number of items in the list. You can view a list or a detailed view of the slowest requests. The detailed view includes the CFML stack trace. For more information, see Request handling.
The Slowest ColdFusion Threads report lists the slowest ColdFusion threads. You can specify the threshold that determines whether a ColdFusion thread appears in this report. As the threshold decreases, the number of requests in the report increases.
The Active Sessions report lists all active sessions. You can view a list, a detailed view, or a graph of active sessions. The graph displays the active sessions and the number of users logged in to the server.
The Cumulative Server Usage report lists the requests that have cumulatively used the most CPU time on the server. Even if a request runs rapidly, if it runs frequently, it can consume a large proportion of CPU time. Tuning requests with high cumulative server time can provide server-wide performance benefits. You can view a list, a detailed view, or a graph of cumulative server usage. Use the Report Size option to limit the number of items in the list.
The Highest Hit Counts report lists the requests that have the highest hit count. You can view a list or a graph of requests with the highest hit count. Use the Report Size option to limit the number of items in the list.
The Template Cache status report shows information about the template cache to indicate how it is performing. The template cache is where ColdFusion stores compiled CFM and CFC templates in memory. When a template is executed for the first time, it is compiled to Java bytecode, and then stored in the template cache. As long as the template is unchanged, ColdFusion uses the compiled form of the template stored in the template cache. The Template Cache status page lets you monitor the cache-hit ratio, which indicates the number of cache hits in relation to the number of cache misses. Cache hits are the templates retrieved from the cache. Cache misses are the templates that must be compiled before being placed in the cache. A server that is performing well should have more cache hits than misses, which is a high cache-hit ratio. If the cache-hit ratio is too low, you might want to increase the cache size by selecting Server Settings > Caching in the ColdFusion Administrator. For more information, see Caching. The Template Cache page also lets you monitor the number of templates in the cache, and the estimated memory that the cache occupies.
The Request Throttle Data report lists all requests that the ColdFusion server throttles. Requests are throttled when ColdFusion queues them, because not enough total memory is available to handle them. Requests smaller than the specified limit are neither queued nor counted as part of the total memory. Requests larger than the specified limit are counted as part of total memory and are queued if the request throttle-memory size of the request is exceeded. The default value is 4 MB. To change the throttle threshold and memory, select Server Settings > Settings in the ColdFusion Administrator.