Oddly long compile (install?) times

eccerr0r · Posted: Tue Jul 30, 2024 2:06 pm Post subject:

Yeah I think this is due to running emerge --jobs and due to install ordering it chose to install it after llvm finished for whatever reason... I totally discount any build times in /var/log/emerge.log due to this if I do emerge --jobs ... at the very least, and yes this has happened, I've had emerge --jobs build qtwebengine and firefox at the same time. That's definitely going to hurt.
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Intel Core i7 2700K/Radeon R7 250/24GB DDR3/256GB SSD
What am I supposed watching?

Hu · Administrator Joined: 06 Mar 2007 Posts: 22378

In my opinion, this represents a design limitation in creating tools like qlop. Portage logs enough information to get this right in simple cases, but if you really want accurate data, then you need Portage to log the data in a way that does not require qlop to infer anything, and instead allows qlop to be a glorified grep + reformatting tool.

eschwartz · Developer Joined: 29 Oct 2023 Posts: 132

FEATURES=merge-wait is relevant here as well -- note the description: "it can be disabled in order to trade the possibility of random build failures for greater parallelism."

See also https://bugs.gentoo.org/663324

Of course, the "build qtwebengine and firefox at the same time" case is broadly speaking unsolvable since in such a scenario every package genuinely takes longer to build since they fail to get an exclusive lock on system resources.