CFCACHE in CF8

I just started using cfcache on my site and its really helped my site's performance.

But now I have a cache directory with 8000+  .tmp (cached pages) files and using  1 GB of server space.

I would like to manually delete some of these files from the cache directory but I don't want to delete pages that might be popular.

I'd like to delete rarely accessed pages from the cache directory to reduce the size of the cache directory.

I thought there was  mapping file ....maybe ...cfcache.map that listed the page name being cached and the corresponding tmp file.

Where could I find the mapping file that lists the page name being cached and the corresponding tmp file?

I am using CF8.

thanks