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The status of how the various XperienCentral subsystems are performing is then shown using an easily identifiable color-coded system:
| Performance Indicator | Description |
| The functionality/configuration setting is functioning within optimally expected parameters. |
| The functionality/configuration setting is functioning below its optimal level. |
| The functionality/configuration setting is having a pronounced, negative impact on XperienCentral's performance and should be immediately examined and addressed. |
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To open the Performance Dashboard, navigate to Configuration > Performance Dashboard.
In This Topic
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System Performance Indicators
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| Indicator | Description |
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| Debugging options | Specifies the status of the XperienCentral debug options. If any debug option is enabled, the status is red. |
| Log level | Specifies the level of logging that is currently set for XperienCentral. Logging can be enabled for the following system functionality:
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When a page is requested and caching is enabled, XperienCentral determines whether the page can be returned from the cache (see 1 in the figure below) and returns it; if the page cannot be returned from the cache, it is generated by the Page Generator and returned (see 2 in the figure below):
To enable monitoring for web pages and/or pages generated by the Page Generator pages, select "Monitoring enabled".
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When these monitoring settings are enabled, the pages returned by the Page Generator that took the longest to generate as well as the pages that took the longest time to load are listed. The pages that appear in the list are those that have been read since monitoring was enabled or since the last time that the list was cleared using the [Clear list] button.
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To view the contents of a page in the list in a separate window, click its URL in the list. This makes it easy for you to quickly view the contents of the slowest pages. The page will display in a separate window.
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Not all pages in the list are viewable due to context-related factors. If the page cannot be displayed, a JavaScript error will be returned. |
To refresh the list, click [Refresh this page]. To clear the list, click [Clear list]. For information about steps you can take to improve the performance of slow pages, See Lowering Page Response Times.
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Page Cache Ratio Indicators
The Page cache ratio tab shows the pages with the smallest cache ratio, that is pages that are more often being regenerated instead of being returned from the cache. The higher the number, the better this is for performance. The page cache ratio is always a number between 0 and 1 (between 0% and 100%).
To enable page cache ratio monitoring, select '"Monitoring enabled". The average cache ratio for the pages with the lowest cache ratio are listed. Ideally this number should always be 1 (100% of requests could be returned from the cache). The pages that appear in the list are those that have been read since monitoring was enabled or since the last time that the list was cleared using the [Clear list] button.
To view the contents of a the pages with the smallest cache ratios, click its URL in the list. This makes it easy for you to quickly view the contents of the pages. The page will display in a separate window.
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Not all pages in the list are viewable due to context-related factors. If the page cannot be displayed, a JavaScript error will be returned. |
To refresh the list, click [Refresh this page]. To clear the list, click [Clear list]. For information on improving cache ratio, see Lowering the Cache Ratio.
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Use the Queries tab to monitor and examine the queries that have taken the most time (the slowest). To enable query monitoring, select "Monitoring enabled":
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After query monitoring is enabled, the speed of all queries performed by XperienCentral will be monitored. In the "Slowest Queries" list, the slowest query monitored appears at the top of the list. The queries that appear in the list are those that have run since monitoring was enabled or since the last time that the list was cleared using the [Clear list] button.
To see the full query, click it in the list. In the "Details" box the full query appears. From here you can also copy the query and paste it in another application:
To refresh the list to see the latest queries, click [Refresh this page]. To clear the list, click [Clear list].
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Improving System Performance
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If caching is enabled in XperienCentral, a green indicator is shown and if it is disabled, a red indicator is shown. Caching allows XperienCentral to handle the load created by many page requests by using an intelligent mechanism that returns pages without having to regenerate them completely every time they are requested. In all cases, caching improves website performance and it is highly recommended that you enable it for your website.
To enable/disable caching, navigate to the Setup Tool. On the General tab, navigate to the "frontend_system_settings" section and select allow_cache:
For more information on caching in XperienCentral, see Caching.
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The caching module of XperienCentral stores a timestamp in the timestamp database for each cached web page. This timestamp is needed in order to determine whether the web page needs to be regenerated or whether it can be retrieved from the cache. For high volume websites, the number of web page requests per second can be so high that even the relatively simple task of performing one SQL query to retrieve this timestamp from the database can cause a bottleneck. If this exceeds 500 milliseconds, it may indicate a performance issue.
To prevent timestamp retrieval from becoming a bottleneck, timestamps can be cached in memory for <n> milliseconds. Note that this also causes a delay of <n> milliseconds; during the <n> milliseconds, modified web pages will not be regenerated. It is recommended that you set timestamp caching to at least 5000 milliseconds (5 seconds). If you set timestamp caching to fewer than 5000 milliseconds, this can cause database bottlenecks especially for websites that experience a large number of page requests.
Timestamp caching is configured in the XperienCentral Setup Tool. Navigate to the "frontend_system_settings" section of the General tab:
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To enable/disable the XperienCentral debug options that affect performance, navigate to the Setup Tool. On the General tab, navigate to "development_settings". Clear the checkbox for enable_debug_messages. In a production environment, the setting enable_view_resolve_cache should be selected.
Setting the Log Level
The level at which you log messages has a direct effect on system performance. Each time a system event is logged, a small performance hit occurs. Logging messages of type SEVERE affects the system the least whereas logging at the INFO level can cause the system to slow down due to the sheer volume of messages that are written to the log. The effect that the logging level has on XperienCentral performance is indicated as follows.
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For more information on logging events in XperienCentral, see the Log administrative page.
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Creating Custom Performance Indicator Tabs
In addition to the four default tabs, you can develop and extend the XperienCentral Performance Dashboard using custom plugins. See Adding Custom Indicators to the Performance Dashboard.