NCSA Mosaic for MS Windows User Guide: Customizing

Cache

The Cache window contains options for changing memory and disk cache information.

Memory Cache

Number of documents kept in memory:
shows the number of documents maintained in cache during a Mosaic session. The memory cache is volatile, and its contents are deleted when your Mosaic session is closed.
Clear Memory Cache
clears the current memory cache

Disk Cache

Location:
defines the drive and directory (\directory\path\) used to maintain the non-volatile disk cache (e.g., c:\Mosaic\Cache\)
Size (KB):
displays the maximum number of kilobytes (KB) that Mosaic can allocate to the disk cache (1 megabyte = 1024 kilobytes)
Enabled
Cache is turned on, meaning that Mosaic stores the file in the disk cache for use later. See "Advanced Cache Manager" on page 4-7 for more information.
Fast Image Caching
converts inlined images into bitmapped format (.bmp file extension) when caching the image. Mosaic paginates bitmapped files faster than it does GIF or JPEF files (see Appendix A, "Glossary"). If unchecked, images are saved in their original format and must be decoded before pagination.
Never purge home page
keeps your home page permanently in the disk cache. If unchecked, your home page is purged as is any other file in your cache.
Clear Cache on Exiting Mosaic
clears your disk cache when you quit from NCSA Mosaic
Check Modification Date From Server
checks a file's modification date at the rate defined below:
Once Per Session--checks the modification date only once during your Mosaic session

Always--checks the modification date each time you view a file during your Mosaic session

The Advanced Cache Manager button opens another dialog box with more cache features. See "Advanced Cache Manager" on page 4-7.

Advanced Cache Manager

The advanced cache manager helps manage and view the contents of your disk cache.

Hits, Size, File, URL

Hits
number of times the file has been accessed from the cache
Size
size of the file in bytes
File
name of the file
URL
original location of the file
Below this box is statistical information for the contents of the cache (e.g., total number of files, the actual size of the disk cache). The Cache Hit Percentage shows the percentage of times you accessed the cache during the life of the cache and during the present Mosaic session.

Cache the following mime types? is a list of the current MIME types listed in your viewers section and the cache status for each MIME type.

Select a MIME type from the Cache the following mime types? field and click Yes to add this type of file to your disk cache. Select a MIME type from the Cache the following mime types? field and click No to remove the file type from the disk cache. You can also double click on the MIME type to toggle between yes and no.

Load URL button
select a URL from the cache management window and click Load URL to load the file
Delete button
deletes the selected item from the cache
Never Purge button
Highlight an item in the cache and click Never Purge to save the cashed item permanently. Permanently saved items are marked by an asterisk (*) next to the Hits number.
Can Purge button
Highlight an item marked with an asterisk and click Can Purge to removed the asterisk. If Check Modification Date From Server is checked, Mosaic updates the file the next time you visit the Web site.
Clear All button
removes the contents of the disk cache
Mosaic does not clear Never Purge items by default. Confirm your deletion (Delete item marked as "Never Purge"? Y/N).

Sort By

Select one sort option for your cached files by clicking the appropriate radio button:

File radio button
sorts by file type
Server radio button
sorts by WWW server name
Size radio button
sorts by file size
Hits radio button
sorts by the number of times the file is hit from the cache (i.e., frequency of use). The list is sorted from the highest hit percentage (top) to the lowest (bottom).
MIME radio button
sorts by MIME (Multipurpose Internet Mail Extension) type