So, I had the pleasure of meeting Brian Cantrill on Tuesday. dtrace rocks.
One of the things we need to constantly be aware of writing high-performance apps is the number of system call induced by a specific C routine. This is often achieved by using strace/ktrace/truss and guessing the boundaries or by simply looking at the function and enumerating the syscalls. However, as the function you are investigating scopes higher, the more complicated it is to ascertain the number of syscalls you expect.
