For the test of the nntpcache we only had a DEC Alpha computer running Linux available and the nntpcache crashed soon after it was started. However, this may be related to a type problem (32/64Bit integers). Nntpcache works on Intel Pentium machines running Linux.
Unfortunately we could not find any work published along with the nntpcache or dealing with it in any form. Hence we cannot provide comparisons to the nntpcacheīs design decisions.