File Cache Dynamic Control and Monitoring

File Cache stores file contents in the memory. You can add an object to obj.conf to dynamically monitor and control the file cache while the server is running.

To Control and Monitor the File Cache

1. Add a NameTrans directive to the default object:

   NameTrans fn="assign-name" from="/nsfc" name="nsfc"

2. Add an nsfc object definition:

   <Object name="nsfc">
   Service fn="service-nsfc-dump"
   </Object>

   This configuration enables the file cache control and monitoring function (nsfc-dump) to be accessed through the URI /nfsc. To use a different URI, change the from parameter in the NameTrans directive.

   The following is an example of the information you receive when you access the URI:

   Sun Java System File Cache Status (pid 3602) The file cache is enabled. Cache resource utilization Number of cached file entries = 174968 (152 bytes each, 26595136 total bytes) Heap space used for cache = 1882632616/1882632760 bytes Mapped memory used for medium file contents = 0/1 bytes Number of cache lookup hits = 47615653/48089040 ( 99.02 %) Number of hits/misses on cached file info = 23720344/324195 Number of hits/misses on cached file content = 16247503/174985 Number of outdated cache entries deleted = 0 Number of cache entry replacements = 0 Total number of cache entries deleted = 0 Parameter settings ReplaceFiles: false ReplaceInterval: 1 milliseconds HitOrder: false CacheFileContent: true TransmitFile: false MaxAge: 3600 seconds MaxFiles: 600000 files SmallFileSizeLimit: 500000 bytes MediumFileSizeLimit: 1000001 bytes BufferSize: 8192 bytes CopyFiles: false Directory for temporary files: /tmp Hash table size: 1200007 buckets

   You can include a query string when you access the URI. The following values are recognized:

   • ?list: Lists the files in the cache.

   • ?refresh=n: Causes the client to reload the page every n seconds.

   • ?restart: Causes the cache to be shut down and then restarted.

   • ?start: Starts the cache.

   • ?stop: Shuts down the cache.

   If you choose the ?list option, the file listing includes the file name, a set of flags, the current number of references to the cache entry, the size of the file, and an internal file ID value. The flags are as follows:

   • C: File contents are cached.

   • D: Cache entry is marked for delete.

   • E: PR_GetFileInfo() returned an error for this file.

   • I: File information including size and modification date is cached.

   • M: File contents are mapped into virtual memory.

   • O: File descriptor is cached (when TransmitFile is set to true).

   • P: File has associated private data and appears on shtml files.

   • T: Cache entry has a temporary file.

   • W: Cache entry is locked for write access.