Sort based inversion: example
<a,1,2>
<b,1,2>
<c,1,1>
<a,2,2>
<d,2,1>
<b,2,1>
<b,3,1>
<d,3,1>
<a,1,1>
<a,2,2>
<b,1,2>
<c,1,1>
<b,2,1>
<b,3,1>
<d,2,1>
<d,3,1>
<a,1,1>
<a,2,2>
<b,1,2>
<b,2,1>
<b,3,1>
<c,1,1>
<d,2,1>
<d,3,1>
Initial dump
from corpus
Sorted Runs
Merged Runs
(fully sorted)
 What’s the performance of this algorithm?
 Saves memory but very disk intensive!