Measuring directly from cpu hardware performance counters

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CPUs embed a performance monitoring unit (PMU) which we can use to collect data on cache usage (hit/miss) branch predictions, instructions, cycles, etc. those counters can be accessed in Java thanks to the overseer library.

Logiciels

Measuring directly from CPU :
Hardware performance
counters
Jean-Philippe BEMPEL
Performance Architect
@jpbempel
http://jpbempel.blogspot.com

●Measuring time
○ System.CurrentTimeMillis()
○ System.nanoTime()
●Timestamps in logs
●Profiling
Measuring

● System.currentTimeMillis()
1ms -> 10-15ms depending on the OS
● System.nanoTime()
500ns -> 1us
Précision

● CPUs embeds PMU (Processing Monitoring Unit)
● Hardware counters on CPU behavior:
○ Cycles
○ Instructions
○ Caches
○ Memory accesses
● predefined or customizable
Compteurs de performance

●available on most linux distros
●Allow to access perf counters but allow other things
(profiling, OS counters, …)
●list perf counters: perf list
●Profiler with default counters
perf stat java…
●Customize a perf counter
perf stat -e LLC-load-misses java ...
Perf

● Overseer library:
○ http://www.peternier.com/projects/overseer/overseer.php
● libpfm4:
○ http://perfmon2.sourceforge.net/
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Measuring directly from cpu hardware performance counters

1. Measuring directly from CPU : Hardware performance counters Jean-Philippe BEMPEL Performance Architect @jpbempel http://jpbempel.blogspot.com

2. ●Measuring time ○ System.CurrentTimeMillis() ○ System.nanoTime() ●Timestamps in logs ●Profiling Measuring

3. ● System.currentTimeMillis() 1ms -> 10-15ms depending on the OS ● System.nanoTime() 500ns -> 1us Précision

4. ● CPUs embeds PMU (Processing Monitoring Unit) ● Hardware counters on CPU behavior: ○ Cycles ○ Instructions ○ Caches ○ Memory accesses ● predefined or customizable Compteurs de performance

5. Hiérarchie mémoire

6. échelle de latence

7. ●available on most linux distros ●Allow to access perf counters but allow other things (profiling, OS counters, …) ●list perf counters: perf list ●Profiler with default counters perf stat java… ●Customize a perf counter perf stat -e LLC-load-misses java ... Perf

8. DEMO Perf

9. ●java library (JNI - linux only) ●Allow to use all available counters ●Based on libpfm4 ○Encodes counters based on CPU ●Profile precisely part of the code of applications Overseer

10. DEMO Overseer

11. DEMO Memory layout: LinkedList

12. DEMO Memory layout: ArrayList

13. Pipeline

14. ● Overseer library: ○ http://www.peternier.com/projects/overseer/overseer.php ● libpfm4: ○ http://perfmon2.sourceforge.net/ Liens

15. Thanks for your attention. Questions?