WebSphere® Application Server provides plug-ins for several web server brands and versions. Each web server operating system combination has specific tuning parameters that affect the application performance.
Following is a list of tuning parameters specific to web servers. The listed parameters may not apply to all of the supported web servers. Check your web server documentation before using any of these parameters.
You can also configure the IBM HTTP Server to show a status page:
#LoadModule status_module, modules/ApacheModuleStatus.dll, #<Location/server-status> #SetHandler server-status #</Location>
All of these web servers allocate a thread to handle each client connection. Ensuring that enough threads are available for the maximum number of concurrent client connections helps prevent this tier from being a bottleneck. The settings for these web servers can be tuned by making changes to the httpd.conf file on the web server system.
You can check the IBM HTTP Server error_log file to see if there are any warnings about having reached the maximum number of clients (MaxClients). There are several parameters, depending on the specific operating system platform, that determine the maximum number of clients the web server supports. See http://httpd.apache.org/docs-2.0/mod/mpm_common.html#maxclients for a description of the MaxClients parameters.
The goal of the default load balance option, Round Robin, is to provide an even distribution of work across cluster members. Round Robin works best with web servers that have a single process sending requests to the Application Server. If the web server is using multiple processes to send requests to the Application Server, the Random option can sometimes yield a more even distribution of work across the cluster.
How can lowering the retry interval affect throughput ? If the plug-in attempts to connect to a particular application server and that application server is offline or in the process of restarting, the requests must wait for a timeout period. This process causes delayed responses for those requests. If you set the retry interval value too high, then an available application server is not utilized.
Making these changes can help the IBM HTTP Server to support more product users. To modify these properties, in the administrative console, click Servers > Server Types > Web Servers > web_server_name > Plug-in properties > Request routing .
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