Raito Bezarius 85db5e3bf4 libstore/store-api: rate-limit concurrent copies based on system limits
Since we have async, we are unleashed and therefore we started to cause
people to run into system limits like number of open files.

We introduce an async semaphore which uses max(25 % of max open files,
max number of cores) which should lead to 256 maximum concurrent copies.

We believe that the copy operation is the only one that can cause issues
given that the daemon already runs with obscene fd limits.

Fixes #1022.

Change-Id: Iec433d10d5c5003962ea749cf8e32bafb314f0d9
Signed-off-by: Raito Bezarius <raito@lix.systems>
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Lix

Lix is an implementation of Nix, a powerful package management system for Linux and other Unix systems that makes package management reliable and reproducible.

Read more about us at https://lix.systems.

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On Linux and macOS the easiest way to install Lix is to run the following shell command (as a user other than root):

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For systems that already have a Nix implementation installed, such as NixOS systems, read our install page

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License

Lix is released under LGPL-2.1-or-later.

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