chirayuk / d8_ex_20140929

d8 profiling example

This is reference example I made of d8 tracing a few months ago.

Personal Notes:

Ref: https://gist.github.com/kevincennis/0cd2138c78a07412ef21, Creating V8 profiling timeline plots

d8 is at ~/vcs_3p/v8/out/x64.debug/d8

Links

• v8/V8Profiler: How to profile V8 using the built-in profiler
• Creating V8 profiling timeline plots
• Installing V8 on a Mac
  • d8 --trace-opt-verbose file.js
  • d8 --trace-opt --trace-deopt test.js
  • time d8 --prof test.js
  • d8 --trace-gc test.js
  • d8 --allow-natives-syntax file.js
    • %CollectGarbage(null);
    • %HaveSameMap(new Foo(1), new Foo(2)) (test if the hidden classes are the same)
• Nathanaela/v8-Natives
  • v8-native-calls.js
  • CollectGarbage, HaveSameMap
  • hasFastProperties(obj), hasFastSmiElements(obj), hasFastObjectElements(obj), hasFastDoubleElements(obj), hasDictionaryElements(obj), hasFastHoleyElements(obj), haveSameMap(obj1, obj2), isObserved(obj), isValidSmi(obj), isSmi(obj), isInPrototypeChain(item, obj), hasFastSmiOrObjectElements(obj), hasSloppyArgumentsElements(obj)
• IR Hydra²: mraleph/irhydra
  • (Pre)release IRHydra 2.0
  • Release the IRHydra!
• June 13th, 2013: Use forensics and detective work to solve JavaScript performance mysteries - HTML5 Rocks
  • Nice article on the use of d8/v8/node flags and performance debugging.
  • -no-sandbox --js-flags="--prof --noprof-lazy --log-timer-events"
  • tools/linux-tick-processor /path/to/v8.log
  • tools/plot-timer-event /path/to/v8.log
  • --js-flags="--trace-deopt --trace-opt-verbose"
• thlorenz/v8-perf/compiler.md
• thlorenz/v8-perf/performance-profiling.md

Build V8 debug

Ref: https://gist.github.com/kevincennis/0cd2138c78a07412ef21

::bash
git clone [e-mail]:v8/v8.git
cd v8
make builddeps && make x64.debug

alias d8=/path/to/v8/repo/out/x64.debug/d8
alias tick-processor=/path/to/v8/repo/tools/mac-tick-processor