Hi, Inline Caches are a crucial optimization <https://en.wikipedia.org/wiki/Inline_caching> to speed up property accesses. Usually, you get misses the first time an inline cache is used (for initialization) or when the shape of objects is different (different order, different types of properties).
Spending 55% of your time in LoadIC_Miss seems really high. Without access to the repro this is hard to assess. cheers, Camillo On Sat, 25 Jul 2020 at 21:12, Wayakorn Vadhanasin <wayak...@gmail.com> wrote: > I am working on updating my Electron app from Electron 4 (Chromium 69) to > Electron 8 (Chromium 80). I am occasionally experiencing random delays in > my app while calling a JS function to process HTML DOMs (no external > callouts). > > Looking closely at the profiling data collected from the Windows > Performance Analysis tool, I am seeing the following calls during the repro: > > * v8::internal::Runtime_LoadIC_Miss* - 55% > * v8::internal::LoadIC::Load *- 13% > > More details on the LoadIC_Miss: > v8::internal::IC::UpdatePolymorphicIC > v8::internal::IC::SetCache > v8::internal::LoadIC::UpdateCaches > v8::internal::LoadIC::Load > v8::internal::Runtime_LoadIC_Miss > > Very few instances of the above occurred in a normal condition, only when > there was a perf issue. > > I'd like to understand more what inline cache is doing. Have there been > many churns in this area since Chromium 69? Any hints or suggestions on the > next step of investigation is appreciated. Thanks in advance. > > Way > > > > > -- > -- > v8-users mailing list > v8-users@googlegroups.com > http://groups.google.com/group/v8-users > --- > You received this message because you are subscribed to the Google Groups > "v8-users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to v8-users+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/v8-users/ad7fe487-be79-491a-96ee-37c286274c12n%40googlegroups.com > <https://groups.google.com/d/msgid/v8-users/ad7fe487-be79-491a-96ee-37c286274c12n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- -- v8-users mailing list v8-users@googlegroups.com http://groups.google.com/group/v8-users --- You received this message because you are subscribed to the Google Groups "v8-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to v8-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/v8-users/CAOeS1i9hU90EV4Mj21Xmo_1_jw3hfrs6SCkECct_jN-%3DdgQF1A%40mail.gmail.com.
