I am not sure about how well DTrace works on Fedora. What Oracle is shipping with Oracle Linux is not compatible with GPL licensing (read CDDL) and hence can't

I am not sure about how well DTrace works on Fedora. What Oracle is shipping with Oracle Linux is not compatible with GPL licensing (read CDDL) and hence can't be included as it is by other Linux distributions. Having said, I will try the fedora 18 package when I get a chance and reply back here. But in the meanwhile, for best results - please try it on one of the OSes I mentioned in blog post. Also, just to double check you are running those commands with sudo right? dtrace won't work without root access. Also forgot to mention, I am using DTrace that ships with Mountain Lion and DTrace api version is - Sun D 1.6.2.