- From: Luigi Rizzo <luigi@labinfo.iet.unipi.it>
- Date: Tue, 20 Aug 1996 20:16:52 +0200 (MET DST)
- To: Hull Chris <Chris.Hull@fmr.com>
- Cc: tai@hplb.hpl.hp.com, http-wg%cuckoo.hpl.hp.com@hplb.hpl.hp.com, ircache@nlanr.net, l.vicisano@iet.unipi.it, Luigi Rizzo <luigi@labinfo.iet.unipi.it>
> Well, actually the current hit rate is zero. Due to sizing > problems we have had to turn off caching a few weeks ago. That's > why I found out about this list, and also why I wrote some code to > analyze 600MB of log files. I'm looking to implement a multi-level > cache, distributed over three sites, but today I am just collecting > data to model the sizing issues. We have a techreport: http://www.iet.unipi.it/~luigi/caching.ps.gz which discusses some issues in the relation between cache size and hit rate. Actually, we have also done some simulations on the performance of hierarchical and/or cooperating caches; a report on that is not available yet, but the bottom line is the following: N cooperating caches (a la Harvest) with disk capacity D each work almost as a single cache with N*D disk space (for N not too large, let's say N < 10). The communication between caches is a small fraction of the overall traffic (because it only affects documents which are accessed more than once). Luigi ==================================================================== Luigi Rizzo Dip. di Ingegneria dell'Informazione email: luigi@iet.unipi.it Universita' di Pisa tel: +39-50-568533 via Diotisalvi 2, 56126 PISA (Italy) fax: +39-50-568522 http://www.iet.unipi.it/~luigi/ ====================================================================
Received on Tuesday, 20 August 1996 11:07:14 UTC