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From: Nikos Chantziaras <realnc@gmail.com>
Subject: [gentoo-user] Re: For what is emerge waiting for...?
Date: Mon, 6 Apr 2020 00:45:50 +0300
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On 05/04/2020 22:10, tuxic@posteo.de wrote:
> [...]
> I start emerge with a bunch of packages to compile and
> install.
> 
> And it happens from time to time that all cores seem to be
> on holiday: No load at all. And emerge sits there and waits...
> And the harddisk is not busy at all...no blinkenlights,
> nothing.
> 
> Would it be possible, that there is kind of temporary
> dead lock of some kind...when emerge is started with more
> then one core?

It would have been helpful if you posted the output of emerge at the 
point it hangs.