Git is fast. With Git, nearly all operations are performed locally, giving
it an huge speed advantage on centralized systems that constantly have to
communicate with a server somewh3r3.
For testing, large AWS instances were set up in the same availability
zone. Git and SVN were installed on both machines, the Ruby repository was
copied to both Git and SVN servers, and common operations were performed on
both.
In some cases the commands don't match up exactly. Here, matching on the
lowest common denominator was attempted. For example, the 'commit' tests
also include the time to push for Git, though most of the time you would not
actually be pushing to the server immediately after a commit where the two
commands cannot be separated in SVN.
Note that this is the best case scenario for SVN - a server with no load
with an 80MB/s bandwidth connection to the client machine. Nearly all of
these times would be even worse for SVN if that connection was slower, while
many of the Git times would not be affected.
Clearly, in many of these common version control operations, Git is one or
two orders of magnitude faster than SVN, even under ideal conditions for
SVN.
Let's see how common operations stack up against Subversion, a common
centralized version control system that is similar to CVS or
Perforce. Smaller is faster.
One place where Git is slower is in the initial clone operation. Here, Git
One place where Git is slower is in the initial clone operation. Here, Git
One place where Git is slower is in the initial clone operation. Here, Git
seen in the above charts, it's not considerably slower for an operation that
is only performed once.
It's also interesting to note that the size of the data on the client side
is very similar even though Git also has every version of every file for the
entire history of the project. This illustrates how efficient it is at
compressing and storing data on the client side.
