Maybe I've complicated my question needlessly. To rephrase, when using custom startup snapshots, via `mksnapshot`, will the snapshotted code run slower than the same code loaded from sources at runtime?
Thanks, Alex On Wednesday, February 14, 2018 at 6:57:38 PM UTC+2, Alexandru Dima wrote: > > Hi, > > Which one would you recommend we (VSCode) use? > > Today, we are using cached data, but I wanted to find out if a startup > snapshot would help us more. I've crammed all of VSCode's source code > (except third party node modules) in a file and I've created a startup > snapshot using `mksnapshot`. I would have thought that the startup snapshot > would beat the current cached data usage on startup speed by a long shot... > > I was surprised to see that all of the time gains of using a startup > snapshot (~200-300ms of code loading) is lost and then some while creating > the UI (DOM and stuff...). It looks to me like the code that lives in the > startup snapshot is fundamentally slower (50% or 100% slower), and that > perhaps it does not use inlining? (see the deep stack traces below). > > > 1. Before (using cached data) > > > https://github.com/Microsoft/vscode/files/1724876/snapshot-before.cpuprofile.txt > > https://user-images.githubusercontent.com/5047891/36215842-80a615a2-11ad-11e8-9efc-2d0f2e533e07.png > > > <https://user-images.githubusercontent.com/5047891/36215842-80a615a2-11ad-11e8-9efc-2d0f2e533e07.png> > > > > 2. After (using startup snapshot) > > https://github.com/Microsoft/vscode/files/1724877/snapshot-after.cpuprofile.txt > > https://user-images.githubusercontent.com/5047891/36216039-fcd8aa18-11ad-11e8-9bd4-fe4f1add9546.png > > > <https://user-images.githubusercontent.com/5047891/36216039-fcd8aa18-11ad-11e8-9bd4-fe4f1add9546.png> > > > Is this expected? Cached data is always faster than startup snapshot? > > We are on an oldish version of v8 (5.8.283.38), as we're using Electron > 1.7.9. > > Thanks, > Alex > -- -- 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. For more options, visit https://groups.google.com/d/optout.
