One Level Up Top Level

test/benchmark/cmp_profile.sh - ktap

  1. #!/bin/sh

  3. # This script compare stack profiling performance between ktap and stap.
  4. #
  5. # 1. ktap -e 'profile-1000us { s[stack(-1, 12)] += 1 }'
  6. # 2. stap -e 'probe timer.profile { s[backtrace()] += 1 }'
  7. # 3. stap -e 'probe timer.profile { s[backtrace()] <<< 1 }'

  9. #Result:
  10. #Currently the stack profiling overhead is nearly same between ktap and stap.
  11. #
  12. #ktap reslove kernel stack to string in runtime, which is very time consuming,
  13. #optimize it in future.


  16. gcc -o sembench sembench.c -O2 -lpthread

  18. COMMAND="./sembench -t 200 -w 20 -r 30 -o 2"

  20. #------------------------------------------------------------#

  22. echo -e "without tracing:"
  23. $COMMAND; $COMMAND; $COMMAND

  25. #------------------------------------------------------------#

  27. ../../ktap -q -e 'var s = table.new(0, 20000) profile-1000us { s[stack(-1, 12)] += 1 }' &

  29. echo -e "\nktap tracing: profile-1000us { s[stack(-1, 12)] += 1 }"
  30. $COMMAND; $COMMAND; $COMMAND
  31. pid=`pidof ktap`
  32. disown $pid; kill -9 $pid; sleep 1

  34. #------------------------------------------------------------#

  36. stap -o /dev/null -e 'global s[20000]; probe timer.profile { s[backtrace()] += 1 }' &

  38. echo -e "\nstap tracing: probe timer.profile { s[backtrace()] += 1 }"
  39. $COMMAND; $COMMAND; $COMMAND
  40. pkill stap

  42. #------------------------------------------------------------#

  44. stap -o /dev/null -e 'global s[20000]; probe timer.profile { s[backtrace()] <<< 1 }' &

  46. echo -e "\nstap tracing: probe timer.profile { s[backtrace()] <<< 1 }"
  47. $COMMAND; $COMMAND; $COMMAND
  48. pkill stap

  50. #------------------------------------------------------------#


  53. rm -rf ./sembench

One Level Up Top Level