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shrink Attr by 8 bytes on 64bit machines

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with position and symbol tables in place we can now shrink Attr by a full
pointer with some simple field reordering. since Attr is a very hot struct this
has substantial impact on memory use, decreasing GC allocations and heap size by
10-15% each. we also get a ~15% performance improvement due to reduced GC
loading.

pure parsing has taken a hit over the branch base because positions are now
slightly more expensive to create, but overall we get a noticeable improvement.

before (on memory-friendliness):

  Benchmark 1: nix search --no-eval-cache --offline ../nixpkgs hello
    Time (mean ± σ):      6.960 s ±  0.028 s    [User: 5.832 s, System: 0.897 s]
    Range (min … max):    6.886 s …  7.005 s    20 runs

  Benchmark 2: nix eval -f ../nixpkgs/pkgs/development/haskell-modules/hackage-packages.nix
    Time (mean ± σ):     328.1 ms ±   1.7 ms    [User: 295.8 ms, System: 32.2 ms]
    Range (min … max):   324.9 ms … 331.2 ms    20 runs

  Benchmark 3: nix eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'
    Time (mean ± σ):      2.688 s ±  0.029 s    [User: 2.365 s, System: 0.238 s]
    Range (min … max):    2.642 s …  2.742 s    20 runs

after:

  Benchmark 1: nix search --no-eval-cache --offline ../nixpkgs hello
    Time (mean ± σ):      6.902 s ±  0.039 s    [User: 5.844 s, System: 0.783 s]
    Range (min … max):    6.820 s …  6.956 s    20 runs

  Benchmark 2: nix eval -f ../nixpkgs/pkgs/development/haskell-modules/hackage-packages.nix
    Time (mean ± σ):     330.7 ms ±   2.2 ms    [User: 300.6 ms, System: 30.0 ms]
    Range (min … max):   327.5 ms … 334.5 ms    20 runs

  Benchmark 3: nix eval --raw --impure --expr 'with import <nixpkgs/nixos> {}; system'
    Time (mean ± σ):      2.330 s ±  0.027 s    [User: 2.040 s, System: 0.234 s]
    Range (min … max):    2.272 s …  2.383 s    20 runs
This commit is contained in:
pennae 2022-03-08 15:26:17 +01:00
parent 8775be3393
commit 8168a4cf4a
1 changed files with 11 additions and 2 deletions
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13
src/libexpr/attr-set.hh
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@ -15,11 +15,15 @@ struct Value;
/* Map one attribute name to its value. */
struct Attr
{
/* the placement of `name` and `pos` in this struct is important.
both of them are uint32 wrappers, they are next to each other
to make sure that Attr has no padding on 64 bit machines. that
way we keep Attr size at two words with no wasted space. */
SymbolIdx name;
Value * value;
PosIdx pos;
Value * value;
Attr(SymbolIdx name, Value * value, PosIdx pos = noPos)
: name(name), value(value), pos(pos) { };
: name(name), pos(pos), value(value) { };
Attr() { };
bool operator < (const Attr & a) const
{
@ -27,6 +31,11 @@ struct Attr
}
};
static_assert(sizeof(Attr) == 2 * sizeof(uint32_t) + sizeof(Value *),
"performance of the evaluator is highly sensitive to the size of Attr. "
"avoid introducing any padding into Attr if at all possible, and do not "
"introduce new fields that need not be present for almost every instance.");
/* Bindings contains all the attributes of an attribute set. It is defined
by its size and its capacity, the capacity being the number of Attr
elements allocated after this structure, while the size corresponds to