SpeedShop Experiments

histogram

instructions

0x000

0x100

0x1f0

0xcf0

0xdf0

0xe00

0xf30

PC Sampling Experiment:

Record current instruction address

in a histogram (Overhead ə%)

16 bit wide bins (e.g. -pcsamp)

32 bit wide bins (e.g. -pcsampx)

Usertime Sampling Experiment:

Record all addresses on call stack

(Overhead ɝ%)