Using Systemtap to profile Sugar
In my system (Fedora 18) I found a bug  and needed install systemtap from git. Newer systems can have it solved.
Installing systemtap from git
The installation is very standard, requieres set a destination directory:
$ git clone git://sourceware.org/git/systemtap.git $ cd systemtap/ $ ./configure --prefix=/home/gonzalo/systemtap-2.5-27886 $ make $ make install
Installing from repositories
You can try install from repositories too.
# yum install -y systemtap-devel systemtap-runtime systemtap-client
If you install from git and from the repositories, in the same system, can have conflicts trying to run the probes.
Analyzing memory use with SystemTap