macOS Catalina performance issue

[abathur]

@danieldk

In single-user, all Nix processes are in the process tree of the terminal application, but I assume that this is not true when the Nix daemon is started through launchd ?

@lilyball

Exempting launchd seems like a rather bad idea as that will presumably kill this security feature for a large swath of processes or even all of them, depending on precisely what logic the system uses to determine how to apply exemptions

This may be moot.

Hopefully someone else can confirm or refute this result, but I set a spare system up this evening and have yet to find any way to exempt nix-daemon builds. I currently have exemptions set up for all of the below and am still seeing log entries for my builds:

• com.apple.Terminal
• /bin/bash
• /bin/zsh
• /sbin/launchd
• /nix/store/*-nix-2.4pre*/bin/nix
• /nix/store/*-nix-2.4pre*/bin/nix-daemon

Aside: I didn’t run them enough to have a sense of whether the averages were converging, but run-times for assessed daemon builds were close enough to the assessed single-user builds that I suspect they’d converge if I did.