NANOG 08 feb 98 1400 kc presentatin
NLANR cache hierarchy statistics,
visualization, and roi
8 feb 98
nlanr cache pi: Duane Wessels
data analysis: Alex Rousskov
-- World Conservation Strategy, Grand Canyon newspaper, july 90
we have not inherited the Earth from our parents;
we have borrowed it from our children
daily traffic per NLANR caches (bytes and documents)
daily traffic NLANR supercache
11 NLANR caches, off and on:
cumulative traffic ( 1 webit = O(10TB) )
savings (doc, byte hit ratios) over course of project
supercache daily savings
absolute daily savings
cumulative supercache savings (almost 1 webit)
note superlinear growth of saving rate.
(more recently collected) hierarchy analysis
direct fetch, remote miss
local hits, remote hits
Note SJ cache has no remote hits and misses.
absolute traffic (BO, (
PB's stats similar)
doc types of 5% or more of intensity or volume
images largest category
but which documents most cache-valuable?
relative contribution per traffic category
per-type savings (images well ahead)
cumulative per-type savings
executables in 2nd place,
but low hit ratio reduces their caching efficacy
9 feb 98, alex/kc, firstname.lastname@example.org.