Web Server Tuning
We used IBM HTTP Server 6.1 in our measurement environment. The cluster configuration and the Solaris configuration has a remote web server, find the tuning in Web Server Tuning in Cluster Tuning section. All other configurations have the web server running on the same system as the WebSphere Portal application server. If, during your monitoring, you notice insufficient processor capacity on the system when running the web server and the portal application server on a single system, consider separating the servers onto different systems. We used the following tuning on our web servers:
Table 10: Web Server Tuning
Parameter | AIX | Linux | Windows | z/Linux | Additional Information |
| POWER5 | 2003 | |||
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KeepAliveTimeout | 5 | 5 | 5 | 5 | This value is less than the think |
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| time defined in our scripts to |
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| ensure that testing is |
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| conservative. Each user is |
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| assumed to open a new TCP |
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| connection for each page view. |
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| However, in a live environment, it |
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| can be helpful to increase the |
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| KeepAlive Timeout. A higher |
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| timeout value can increase |
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| contention for HTTP server |
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| processes, if you are running out |
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| of HTTP processes, decrease |
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| this value. |
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ThreadsPerChild | 25 | 25 | 2000 | 25 | The higher number of threads per |
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| child on Windows is due to a |
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| different process model for IHS |
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| on Windows. |
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MaxKeepAliveRequests | 0 | 0 | 0 | 0 | Selecting 0 lets an unlimited |
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| number of requests on a single |
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| TCP connection. |
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MaxRequestsPerChild | 0 | 0 | 0 | 0 |
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StartServers | 2 | 2 | N/A | 2 |
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Access logging | off | off | off | off | This was turned off by |
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| commenting out the following |
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| configuration line: |
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| CustomLog |
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| /usr/HTTPServer/logs/access_log |
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| common |
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ThreadLimit | 25 | 25 | 2000 | 25 |
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ServerLimit | 150 | 120 | N/A | 180 | Set it |
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| 2 3 |
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W E BS P HE R E P O R T AL V 6 . 1 T U N I N G G U I D E
