*Could someone help me understand what is going on in this tick-processor
output?*
(I'm not focusing on the the UI aspect of this code so I grayed the entries
related to DOM.)*
*
1. I see that in the [JavaScript] section, we have calculateWide()appearing
as optimized; yet, it appears again on the bottom as un-optimized.
One of my questions is, is this caused by a "bailout" of the v8
optimizing compiler?
2. Secondly, I see calculateNarrow() appearing* twice* in the [J
avaScript] section once as slow and once as optimized. Does this
indicate that the code used a lot of time and was optimized, or rather that
optimization failed and we had to bail out?
3. Is it a performance problem indicator if ntdll.dll uses almost 90% of
the ticks?
4. Finally, is there some way I can determine whether the Stub: and
Builtin: lines are caused by the calculateWide() or calculateNarrow()
procedures, or something else?
> Statistical profiling result from null, (995 ticks, 1 unaccounted, 0
> excluded).
>
> [Unknown]:
> ticks total nonlib name
> 1 0.1%
> [Shared libraries]:
> ticks total nonlib name
> 893 89.7% 0.0% C:\Windows\SysWOW64\ntdll.dll
> 75 7.5% 0.0% C:\Users\DevUser\AppData\Local\Google\Chrome
> SxS\Application\28.0.1467.0\chrome.dll
> 5 0.5% 0.0% C:\Windows\syswow64\GDI32.dll
> 4 0.4% 0.0% C:\Windows\syswow64\USER32.dll
> 4 0.4% 0.0% C:\Windows\system32\WINMM.dll
> 2 0.2% 0.0% C:\Windows\syswow64\kernel32.dll
> 1 0.1% 0.0% C:\Windows\syswow64\KERNELBASE.dll
> [JavaScript]:
> ticks total nonlib name
> *6 0.6% 54.5% LazyCompile: *calculateWide
> http://localhost:8888/app.js:13217*
> 1 0.1% 9.1% Stub: KeyedLoadElementStub
> 1 0.1% 9.1% Stub: CEntryStub
> 1 0.1% 9.1% LazyCompile: ~calculateNarrow
> http://localhost:8888/app.js:13158
> 1 0.1% 9.1% LazyCompile: *calculateNarrow
> http://localhost:8888/app.js:13158
> 1 0.1% 9.1% Builtin: A builtin from the snapshot
> [C++]:
> ticks total nonlib name
> [GC]:
> ticks total nonlib name
> 3 0.3%
> [Bottom up (heavy) profile]:
> Note: percentage shows a share of a particular caller in the total
> amount of its parent calls.
> Callers occupying less than 2.0% are not shown.
> ticks parent name
> 893 89.7% C:\Windows\SysWOW64\ntdll.dll
> 75 7.5% C:\Users\DevUser\AppData\Local\Google\Chrome
> SxS\Application\28.0.1467.0\chrome.dll
> 2 2.7% LazyCompile: ~getImageSrc
> http://localhost:8888/app.js:823
> 1 50.0% LazyCompile: ~createImageElement
> http://localhost:8888/app.js:6459
> 1 100.0% LazyCompile: ~createElements
> http://localhost:8888/app.js:547
> 1 100.0% LazyCompile: ~getUiElements
> http://localhost:8888/app.js:2479
> 1 100.0% LazyCompile: ~loadElements
> http://localhost:8888/app.js:1187
> 1 50.0% LazyCompile: ~buildApplicationFrame
> http://localhost:8888/app.js:1411
> 1 100.0% LazyCompile: ~loadElements
> http://localhost:8888/app.js:1187
> 2 2.7% LazyCompile: ~createElements
> http://localhost:8888/app.js:547
> 2 100.0% LazyCompile: ~getUiElements
> http://localhost:8888/app.js:2479
> 2 100.0% LazyCompile: ~loadElements
> http://localhost:8888/app.js:1187
> * 2 2.7% LazyCompile: ~calculateWide
> http://localhost:8888/app.js:13217*
> 2 100.0% LazyCompile: ~marshalCalculations
> http://localhost:8888/app.js:13365
> 1 50.0% LazyCompile: ~prepareData
> http://localhost:8888/app.js:5614
> 1 100.0% LazyCompile: ~initMain
> http://localhost:8888/app.js:2165
> 1 100.0% LazyCompile: ~onLoaded
> http://localhost:8888/app.js:1339
> 1 50.0% LazyCompile: ~prepareData
> http://localhost:8888/app.js:4985
> 1 100.0% LazyCompile: ~initMain
> http://localhost:8888/app.js:2165
>
> 1 100.0% LazyCompile: ~onLoaded
> http://localhost:8888/app.js:1339
>
>
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