Notes

Cpu sampling every 10ms
49hz - Doesn’t want lockstep sampling (Thread wakes up every 50ms, 100ms to do something normally sometimes which skews sampled data. Put in a little jitter. 49hz, 51hz, 99hz, etc)
Really good description of flame graphs
X axis is not time! :)
Widths are proportional to presence in stack traces
Height is related to frame ancestry. functions above are called by functions below.
“Which performance issues matter? it’s about finding the big things”
Stack walking isn’t always present in linux distributions or programming environments (eg java)