Rev 4: Setting the set_optimize flag had a huge impact on btree indexes. in http://bzr.arbash-meinel.com/plugins/per_file_graph

[John Arbash Meinel]

At http://bzr.arbash-meinel.com/plugins/per_file_graph

------------------------------------------------------------
revno: 4
revision-id: john at arbash-meinel.com-20091029154811-cnsasss0shnr6r3p
parent: john at arbash-meinel.com-20091029154207-ytmk9o5cc8z7k5c2
committer: John Arbash Meinel <john at arbash-meinel.com>
branch nick: per_file_graph
timestamp: Thu 2009-10-29 10:48:11 -0500
message:
  Setting the set_optimize flag had a huge impact on btree indexes.
-------------- next part --------------
=== modified file 'simple_btree.py'
--- a/simple_btree.py	2009-10-29 15:42:07 +0000
+++ b/simple_btree.py	2009-10-29 15:48:11 +0000
@@ -32,6 +32,9 @@
         # spilled
         btbuilder = btree_index.BTreeBuilder(reference_lists=1, key_elements=2,
                                              spill_at=1*1000*1000)
+        # Note: in testing, setting this has a significant impact. Writing is
+        #       measurably slower, but it shrinks the 4k page index from
+        #       4.7MB => 3.5MB.
         btbuilder.set_optimize(for_size=True)
         total = len(parent_map)
         count = 0