From: Michael Vrable <mvrable@cs.ucsd.edu>
Date: Thu, 21 Jun 2007 18:02:09 +0000 (-0700)
Subject: Try an alternate segment cleaning ordering.
X-Git-Url: https://git.vrable.net/?a=commitdiff_plain;h=09781648e4b608f546a0e9eca3c73b5ac9281a54;p=cumulus.git

Try an alternate segment cleaning ordering.

This one gives more weight to expiring nearly-empty segments.
---

diff --git a/schema.sql b/schema.sql
index 5017d9b..1a7e5ee 100644
--- a/schema.sql
+++ b/schema.sql
@@ -49,7 +49,7 @@ natural join
 
 -- Ranking of segments to be cleaned, using a benefit function of
 -- (fraction free space)*(age of youngest object).
-create view cleaning_order as select *, (1-u)*age as benefit from
+create view cleaning_order as select *, (1-u)*age/(u+0.1) as benefit from
     (select segmentid,
             cast(used as real) / size as u, julianday('now') - mtime as age
         from segment_info)