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Git Compression of Blobs and Packfiles.

Many users of Git are curious about the lack of delta compression at the object (blob) level when commits are first written. This efficiency is saved until the pack file is written. Loose objects are written in compressed, but non-delta format at the time of each commit.

A simple run though of a commit sequence with only the smallest change to the image (in uncompressed TIFF format to amplify the observable behavior) aids the understanding of this deferred and different approach efficiency.

The command sequence:

Create the repo:

MsysGit

Add to your user .gitconfig file (use tabs for indents). Paths are for MsysGit, and may not work in Cygwin:

# Default tools
[merge]
    tool = bc3
[diff]
	tool = bc3
# Beyond Compare
[difftool "bc3"]

	using System;
	using System.Collections.Specialized;
	using System.Web;
	using System.Web.Mvc;
	using System.Web.Routing;
	using Moq;

	/// <summary>
	/// This helper class can be used to set up Moq mocks of MVC3 controllers.
	/// Slightly modified from the original version from Scott Hanselman's blog:

	#!bash.exe
	export SSH_AUTH_SOCK=/tmp/.ssh-socket
	echo ;
	echo Starting connection with ssh-agent...
	ssh-add -l 2>&1 >/dev/null
	if [ $? = 2 ]; then
	rm -f /tmp/.ssh-script /tmp/.ssh-agent-pid /tmp/.ssh-socket
	# Exit status 2 means couldn't connect to ssh-agent; start one now
	echo Creating new ssh-agent...
	ssh-agent -a $SSH_AUTH_SOCK > /tmp/.ssh-script