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authorEelco Dolstra <edolstra@gmail.com>2018-03-16T19·22+0100
committerEelco Dolstra <edolstra@gmail.com>2018-03-16T19·35+0100
commit48662d151bdf4a38670897beacea9d1bd750376a (patch)
tree9da5e14cf7dbea4ca7653de1774ffcc5673f3ef4 /tests/dependencies.builder0.sh
parent3e6b194d78024373c2320f31f4ba0de3d0658b83 (diff)
Reduce substitution memory consumption
copyStorePath() now pipes the output of srcStore->narFromPath()
directly into dstStore->addToStore(). The sink used by the former is
converted into a source usable by the latter using
boost::coroutine2. This is based on [1].

This reduces the maximum resident size of

  $ nix build --store ~/my-nix/ /nix/store/b0zlxla7dmy1iwc3g459rjznx59797xy-binutils-2.28.1 --substituters file:///tmp/binary-cache-xz/ --no-require-sigs

from 418592 KiB to 53416 KiB. (The previous commit also reduced the
runtime from ~4.2s to ~3.4s, not sure why.) A further improvement will
be to download files into a Sink.

[1] https://github.com/NixOS/nix/compare/master...Mathnerd314:dump-fix-coroutine#diff-dcbcac55a634031f9cc73707da6e4b18

Issue #1969.
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