Renderer freezes after opening 2GB or larger files

[rebornix]

• VSCode Version: Stable/Insiders
• OS Version: macOS

Steps to Reproduce:

1. Open a 1.5GB file (with Line Model or Piece Tree)
2. It opens successfully (say the machine has enough memory)
3. Open a 2.1 GB file
4. It freezes after 1+ mins.

As we load the whole file to memory, it exceeds the memory limit of v8 process. We can expose max_old_space_size flag in cli then users can increase the limit themselves.

[rebornix]

@bpasero correct me if I'm wrong, but it seems that when we run Code --js-flags="abc", js-flags is not passed to the renderer process so we need to explicitly have this option in cli.

[bpasero]

@rebornix it should be passed on to the renderer, e.g. when I add --js-flags=harmony I see how that flag is passed on to the renderer when I check with ps aux. See also https://github.com/electron/electron/blob/master/docs/api/chrome-command-line-switches.md

However, if we wanted to introduce a command line option to make this easier for the user, it can be done also programmatically via app.commandLine.appendSwitch (before the on-ready event).