Last time we counted CPU instructions, let’s look at syscalls now! I’ll show you a little tiny tool I added to Cirron that lets you see exactly what syscalls a piece of Python code is calling and how to analyze the trace more effectively. Let’s start with print("Hello") as before: from cirron import Tracer t = Tracer() t.start() print("Hello") trace = t.end() print(trace) # write(1, "Hello\n", 6) = 6 <0.000150s> You can see1 print uses only a single write to write the string "Hello\n" to stdout ...