Download PDF (1.3 MB) - IBM Redbooks
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Use the following procedure to enable cache clearing:<br />
1. Click Tools Options.<br />
2. Click the Privacy tab and make sure that it reads Firefox will: Remember History. Click<br />
OK. This setting enables caching.<br />
If you click Never remember history, caching is disabled and you must change the<br />
setting.<br />
If you click Use custom settings for history, you have additional options that still allow<br />
caching:<br />
– If you select Automatically start Firefox in a private browsing session, caching is<br />
enabled. However, after the browser is closed, everything is erased (not only cache,<br />
but also browsing history) as though you were never using the browser.<br />
– If private browsing is not selected, make sure the Clear history when Firefox closes<br />
check box is cleared.<br />
3. Restart the browser to apply the changes.<br />
4.12 Tuning the HTTP server<br />
The Process Server and Process Center in production scenarios are generally deployed by<br />
using a topology that includes an HTTP server or an HTTP server plug-in. The Process Portal<br />
and Process Designer send multiple requests to their respective server, which are then<br />
handled by this HTTP server. To minimize the number of requests and the size of the<br />
response data to obtain good user response times, tune your HTTP server to efficiently<br />
handle the expected load.<br />
In particular, ensure that caching is effectively enabled in the HTTP server. Much of the<br />
content that is requested by the Process Portal and Process Designer is static (for example<br />
images and JavaScript files), and can be cached in the browser. Of course, ensure that<br />
browser caching is enabled first, but also tune the HTTP server to support caching at that<br />
level. Specifically in the httpd.conf file, use the following caching and compression settings:<br />
► nExpiresActive on<br />
► ExpiresByType image/gif A86400<br />
► ExpiresByType image/jpeg A86400<br />
► ExpiresByType image/bmp A86400<br />
► ExpiresByType image/png A86400<br />
► ExpiresByType application/x-javascript A86400<br />
► ExpiresByType text/css A86400<br />
Tip: 86400 seconds = 1 day<br />
For more information about tuning the <strong>IBM</strong> HTTP Server, which is included as part of<br />
Business Process Manager V8.0, see the <strong>IBM</strong> HTTP Server Performance Tuning page:<br />
http://publib.boulder.ibm.com/httpserv/ihsdiag/ihs_performance.html<br />
For more information about tuning Business Space, see Scalability and Performance of<br />
Business Space and Human Task Management Widgets in WebSphere Process Server v7<br />
white paper:<br />
http://www.ibm.com/support/docview.wss?uid=swg27020684&wv=1<br />
Chapter 4. Performance tuning and configuration 79
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