Why Trace in Production

Injecting syscall faults in Python and Ruby

Counting bytes faster than you'd think possible

Summing ASCII encoded integers on Haswell at almost the speed of memcpy

Syscall Showdown: Python vs. Ruby

This sneaky 1-line change sped up subprocess#communicate 1000x+

Counting CPU Instructions in Python

Recording and visualising the 20k system calls it takes to "import seaborn"