Jie Gao wrote:
 > I wish some of these modules would be able to "touch" cached data so that
 > it would expire cache entries on "last-accessed" rather than on the time
 > the entries were created.

Why?  People used to do that with cached because they had limited space
and wanted to purge the cache with an LRU algorithm to keep size down,
but disk space is too cheap to worry about now.

If an item in the cache is okay to stay there as long as people are
accessing it, you are essentially saying that cached items never become
invalid.  In that case, why bother ever deleting any of them?

- Perrin


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