Rev 3727: Doc update. in http://bzr.arbash-meinel.com/branches/bzr/1.8-dev/lighter_log_file

[John Arbash Meinel]

At http://bzr.arbash-meinel.com/branches/bzr/1.8-dev/lighter_log_file

------------------------------------------------------------
revno: 3727
revision-id: john at arbash-meinel.com-20080919035029-aibb9jq5waxjjs7c
parent: john at arbash-meinel.com-20080919034224-laq19nw522j3c6ge
committer: John Arbash Meinel <john at arbash-meinel.com>
branch nick: lighter_log_file
timestamp: Thu 2008-09-18 22:50:29 -0500
message:
  Doc update.
-------------- next part --------------
=== modified file 'bzrlib/log.py'
--- a/bzrlib/log.py	2008-09-19 03:42:24 +0000
+++ b/bzrlib/log.py	2008-09-19 03:50:29 +0000
@@ -562,8 +562,9 @@
     # Do a direct lookup of all possible text keys, and figure out which ones
     # are actually present, and then convert it back to revision_ids, since the
     # file_id prefix is shared by everything.
-    # Using a set of revisions instead of a set of keys saves about 1MB (out of
-    # say 400). Not a huge deal, but still "better".
+    # Looking up keys in batches of 1000 can cut the time in half, as well as
+    # memory consumption. GraphIndex *does* like to look for a few keys in
+    # parallel, it just doesn't like looking for *lots* of keys in parallel.
     get_parent_map = branch.repository.texts.get_parent_map
     modified_text_revisions = set()
     chunk_size = 1000