1. Mining Workspace
Updates in CVS
Tom Zimmermann

2. RCS file: /home/eclipse/org.eclipse.jdt.core/model/org/eclipse/jdt/core/IBuffer.java,v
Working file: ./org.eclipse.jdt.core/model/org/eclipse/jdt/core/IBuffer.java
head: 1.17
Change Data
branch:
locks: strict
access list:
symbolic names:
v_397: 1.16
v_396a: 1.16
...
Information in cvs logs in all about commits:
v_382: 1.15
JDK_1_5: 1.15.0.2
Root_JDK_1_5: 1.15
Who? What? Why? When? How?
v_381: 1.15
...
keyword substitution: o
total revisions: 24; selected revisions: 24
description:
----------------------------
revision 1.17
But what about updates?
date: 2004/01/13 15:48:42; author: jlanneluc; state: Exp; lines: +1 -1
Updated copyrights to 2004
----------------------------
revision 1.16
date: 2003/12/15 16:25:37; author: jlanneluc; state: Exp; lines: +15 -26
46040
----------------------------
revision 1.15
date: 2003/05/26 16:13:24; author: pmulet; state: Exp; lines: +5 -1
branches: 1.15.2;
*** empty log message ***
----------------------------
...
----------------------------

3. Activity Data
update update commit
checkout
1.14 1.15 1.16
Mary time
smooth integration
update 1.16
Kate
integration with conflicts
update 1.16
John
O 2004-06-13 05:45 +0000 mary foo =foo= <remote>/*
U 2004-06-15 06:56 +0000 mary 1.14 Bar.java foo == <remote>
P 2004-06-17 07:22 +0000 mary 1.15 Bar.java foo == <remote>
M 2004-06-19 07:50 +0000 mary 1.16 Bar.java foo == <remote>
C 2004-06-21 07:48 +0000 john 1.16 Bar.java foo == <remote>
G 2004-06-22 08:48 +0000 kate 1.16 Bar.java foo == /home/kate/foo

4. Parallel Development
How many updates
integrate changes?
JEdit Python
0.26% 0.15% 0.54% 0.43%

5. Parallel Development
How many commits
lead to integrations?
JEdit Python
9.06% 3.89% 9.03% 20.20%

6. Parallel Development
How many integrations
have conflicts?
JEdit Python
22.8% 46.6% 24.3% 38.3%

7. Parallel Development
How many conflicting
changes were discarded?
JEdit Python
38.4% 68.5% 57.8% 57.5%

8. Parallel Development
How many conflicts
are self-conflicts?
JEdit Python
11.2% 42.5% 35.3% 5.2%

9. Parallel
Development
Little impact on
other developers
CVS can integrate
many changes, but
not all.
Developers have
several workspaces.