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APPENDIX C generate, create barcode 128 none with .net projects USS Code 93 obtain a better hit Code 128 Code Set A for .NET ratio. However, the heap size should not be so large that the operating system starts paging cached les.

The CacheInfo section of the perfdump data provides information on how your le cache has been con gured and statistics on how effectively your le cache is being utilized. File caching is enabled by default; this can be seen in Example 7.1 in the File Cache Enabled value.

If you decide to disable the le cache, the remaining elds in this section are not displayed. For sites with scheduled updates to content, consider shutting down the cache while the content is being updated and starting it again after the update is complete. Although performance slows down, the server operates normally when the cache is off.

The File Cache Entries value provides information on the current number of cached entries as well as the maximum number of cache entries possible. Keep in mind that these values are based on the entries, not on how much le cache has been consumed by the le. The amount of le cache (or RAM) consumed by entries can vary based on the size of the entry being cached.

The Web Server attempts to keep this as manageable as possible by caching small les in their entirety in memory but caching only open le descriptors for larger les. You can increase the maximum number of cached entries up to a value of 1,048,576. However, if you set the value to be too large, the server could potentially cache les that are not referenced all that often (this might actually waste memory).

If the value is too small, the bene t of using the le cache is lost. You should monitor the File Cache Hit Ratio to nd the optimal solution for your environment. The File Cache Hit Ratio value provides you with the number of les served out of cache (Total Cache Hits) compared to the number of cache lookups (Total Cache Hits + Total Cache Misses).

A ratio that approaches 100% indicates that the le cache is operating effectively, while numbers approaching 0% could indicate that the le cache is not serving many requests. The Maximum Age eld displays the maximum age (in seconds) of a valid cache entry. This parameter controls how long a le remains cached after it has been placed in the le cache.

An entry older than the Maximum Age setting will be replaced by a new entry for the same le. Set the Maximum Age setting based on whether your static content is updated on a regular schedule. For example, if content is updated four times a day at regular intervals, you could set the maximum age to 21600 seconds (6 hours).

Otherwise, consider setting the maximum age to the longest time you are willing to serve the previous version of a le after it has been modi ed. If your web site s content changes infrequently, you might want to increase this value for improved performance. Web Server 7.

0 provides a new accelerator cache technology that speeds the delivery of small les. The Accelerator Entries eld in the perfdump data speci es the number of les that have been cached in the accelerator cache, as well as the maximum number of les that can be cached. The accelerator cache is automatically.

SAMPLE PLAIN TEXT REPORT DATA enabled and is tigh ANSI/AIM Code 128 for .NET tly coupled with the File Cache Entries setting. It does not have any particular settings of its own, but it can be affected when you modify the File Cache Entries setting.

For example, the maximum number of accelerator cache entries is increased when you increase the number of File Cache Entries. The actual les served from the accelerator cache will typically be smaller than the File Cache Entries number, however, because the accelerator cache caches information about only les and not directories. The Acceleratable Requests setting speci es the number of client requests that were eligible for processing by the accelerator cache.

This includes simple GET requests but does not include requests that explicitly disable caching (such as a forced reload of a web page) or requests that include query strings included in the URI. To maximize the number of requests served out of the accelerator cache, you should structure your web sites to use static les if/when possible and avoid using query strings in requests for static les. When the server serves a static le from the le cache, the accelerator cache might be able to cache the response for faster processing on subsequent requests.

The Acceleratable Responses value speci es the number of times the response to an acceleratable request was eligible for addition to the accelerator cache. To effectively utilize the accelerator cache, you should maximize the number of responses that are acceleratable. In the default con guration, all responses to requests for static les can be cached in the accelerator cache.

The following con guration changes might prevent a response from being acceleratable: ACLs that deny read access Additional directives in the default object of the obj.conf le, including thirdparty plug-ins Using <Client> or <If> containers in an object con guration le s default object Custom access log formats Java servlet lters To maximize the number of responses that are acceleratable, you should avoid such con gurations. The Accelerator Hit Ratio contains the number of times the response for an acceleratable request was found in the accelerator cache.

The Web Server can serve requests from the accelerator cache asynchronously directly from the keep-alive threads, thereby bypassing the Connection Queue altogether. This leads to improved performance for these requests and at the same time reduces contention on the Connection Queue. Higher hit ratios result in better performance, but this can be achieved only if your site is serving content that is relatively static in nature and follows the guidelines speci ed for Acceleratable Requests or Acceleratable Responses.

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