mirror of
https://github.com/privatevoid-net/nix-super.git
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1fe66852ff
since `up` and `values` are both pointer-aligned the type field will
also be pointer-aligned, wasting 48 bits of space on most machines. we
can get away with removing the type field altogether by encoding some
information into the `with` expr that created the env to begin with,
reducing the GC load for the absolutely massive amount of single-entry
envs we create for lambdas. this reduces memory usage of system eval by
quite a bit (reducing heap size of our system eval from 8.4GB to 8.23GB)
and gives similar savings in eval time.
running `nix eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'`
before:
Time (mean ± σ): 5.576 s ± 0.003 s [User: 5.197 s, System: 0.378 s]
Range (min … max): 5.572 s … 5.581 s 10 runs
after:
Time (mean ± σ): 5.408 s ± 0.002 s [User: 5.019 s, System: 0.388 s]
Range (min … max): 5.405 s … 5.411 s 10 runs
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| .. | ||
| built-path.cc | ||
| built-path.hh | ||
| command-installable-value.cc | ||
| command-installable-value.hh | ||
| command.cc | ||
| command.hh | ||
| common-eval-args.cc | ||
| common-eval-args.hh | ||
| editor-for.cc | ||
| editor-for.hh | ||
| installable-attr-path.cc | ||
| installable-attr-path.hh | ||
| installable-derived-path.cc | ||
| installable-derived-path.hh | ||
| installable-flake.cc | ||
| installable-flake.hh | ||
| installable-value.cc | ||
| installable-value.hh | ||
| installables.cc | ||
| installables.hh | ||
| legacy.cc | ||
| legacy.hh | ||
| local.mk | ||
| markdown.cc | ||
| markdown.hh | ||
| nix-cmd.pc.in | ||
| repl.cc | ||
| repl.hh | ||