eG Monitoring
 

Measures reported by SWSFileCacheTest

The SWSFileCacheTest provides file cache statistics for the process of the instance. The cache information section provides statistics on how your file cache is being used. The file cache caches static content so that the server handles requests for static content quickly. The file cache contains information about files and static file content. The file cache also caches information that is used to speed up processing of server-parsed HTML. For servlets and JSPs, other kinds of caching are used.

 The measures made by this test are as follows:

Measurement Description Measurement Unit Interpretation
No_of_Cache_Hits Indicates the number of cache lookup hits during last measurement period. Number  
No_of_Cache_Misses Indicates the number of cache lookup misses during last measurement period. Number  
No_of_Cache_Content_Hits Indicates the number of hits on cached file content during last measurement period. Percent  
Cache_Content_Misses Indicates the number of misses on cached file content during last measurement period. boolean  
No_of_File_Info_Lookups Indicates the number of hits on cached file information during last measurement period. Number  
No_of_FI_Lookup_Failures Indicates the number of misses on cached file information during last measurement period. Number  
No_of_Entries Indicates the number of current cache entries. Number  
Maximum_Cache_Size Indicates the maximum number of cache entries. Number The optimal file cache size is dependent on whether you are running a 32-bit or a 64-bit server. The available address space for a 32-bit server is limited to 4GB. The max-entries for file cache is based on the amount of Java heap, the number of threads (as specified by thread-pool/max-threads), and the connection queue size. It is recommended to cache small, frequently accessed static files in the file cache and use perfdump to ensure that the file cache hit ratio is close to 100%. To achieve this, you may increase file cache size and fine tune the max-entries for optimal performance. In a 64-bit server, due to the increased availability of address space, you can cache more static content in the file cache.
No_of_Open_File_Entries Indicates the number of current open file entries. Number  
Max_Open_Files_Allowed Indicates the maximum number of open files allowed. Number  
Heap_Size Indicates the current heap size. MB  
Maximum_Heap_Cache_Size Indicates the maximum heap cache size. MB The optimal cache heap size depends upon how much system memory is free. A larger heap size means that the Web Server can cache more content and therefore obtain a better hit ratio. However, the heap size should not be so large that the operating system starts paging cached files.
Size_of_Mem_Mapped_File Indicates the size of memory mapped file content. KB  
Max_Mem_Mapped_File_Size Indicates the maximum size of memory mapped file. KB  
Maximum_Age_of_Entries Indicates the maximum age of a valid cache entry. Secs The parameter controls how long cached information is used after a file has been cached. An entry older than the maximum age is replaced by a new entry for the same file.
File_Cache_Enabled Indicates the file cache is enabled or disabled. Boolean