Commit Graph

3 Commits

Author SHA1 Message Date
Shawn O. Pearce
0f3dd233ec Avoid unnecessary git symbolic-ref calls during repo sync
If the m/BRANCH ref is already pointing at the value set in the
manifest there is no reason to set it again.  Leave it alone,
thus saving a full fork+exec call.

Signed-off-by: Shawn O. Pearce <sop@google.com>
2009-04-17 21:03:45 -07:00
Shawn O. Pearce
fbcde472ca Improve repo sync performance by avoid git forks
By resolving the current HEAD and the manifest revision using pure
Python, we can in the common case of "no changes" avoid a lot of
git operations and directly jump out of the local sync method.

This reduces the no-op `repo sync -l` time for Android's 114 projects
from more than 6s to under 0.8s.

Signed-off-by: Shawn O. Pearce <sop@google.com>
2009-04-17 21:03:45 -07:00
Shawn O. Pearce
d237b69865 Implement git ref reading purely in Python
Its much faster to read the refs from 114 projects when the reader
is pure Python and just doing file IO than forking 114 git commands
and parsing their output.

The reader caches refs based upon file mtimes.  If any single ref
file has been modified since the last read, we re-read the entire
repository's ref namespace.  This simplifies the code as we don't
need to worry about shooting down symbolic-refs, but it may cause
more IO than is necessary if only one ref gets updated.

This change drops `repo branches` in Android from 1.658s to 0.206s.
Likewise, `repo sync` improves dramatically as well.

Signed-off-by: Shawn O. Pearce <sop@google.com>
2009-04-17 21:03:41 -07:00