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vm: simplify slot and make it private

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Hiding refcounter inside a slot is actually a good idea, but it makes the
structure somewhat bigger, especially given that the refcounter is the same
and belongs more to VM or Context. New structure is a bit more efficient:

name                    old time/op    new time/op    delta
ScriptFibonacci-8          672µs ± 2%     644µs ± 0%  -4.15%  (p=0.008 n=5+5)
ScriptNestedRefCount-8    1.08ms ± 1%    1.05ms ± 2%  -2.56%  (p=0.008 n=5+5)
ScriptPushPop/4-8         1.52µs ± 1%    1.47µs ± 1%  -3.14%  (p=0.008 n=5+5)
ScriptPushPop/16-8        3.66µs ± 1%    3.54µs ± 1%  -3.24%  (p=0.008 n=5+5)
ScriptPushPop/128-8       24.7µs ± 1%    23.2µs ± 1%  -6.14%  (p=0.008 n=5+5)
ScriptPushPop/1024-8       183µs ± 1%     173µs ± 1%  -5.01%  (p=0.008 n=5+5)

name                    old alloc/op   new alloc/op   delta
ScriptFibonacci-8          114kB ± 0%     114kB ± 0%    ~     (p=0.079 n=4+5)
ScriptNestedRefCount-8     241kB ± 0%     241kB ± 0%    ~     (p=0.333 n=5+4)
ScriptPushPop/4-8           160B ± 0%      160B ± 0%    ~     (all equal)
ScriptPushPop/16-8          640B ± 0%      640B ± 0%    ~     (all equal)
ScriptPushPop/128-8       8.70kB ± 0%    8.70kB ± 0%    ~     (all equal)
ScriptPushPop/1024-8      73.2kB ± 0%    73.2kB ± 0%    ~     (all equal)

name                    old allocs/op  new allocs/op  delta
ScriptFibonacci-8          3.17k ± 0%     3.17k ± 0%  -0.03%  (p=0.008 n=5+5)
ScriptNestedRefCount-8     10.7k ± 0%     10.7k ± 0%    ~     (all equal)
ScriptPushPop/4-8           8.00 ± 0%      8.00 ± 0%    ~     (all equal)
ScriptPushPop/16-8          32.0 ± 0%      32.0 ± 0%    ~     (all equal)
ScriptPushPop/128-8          259 ± 0%       259 ± 0%    ~     (all equal)
ScriptPushPop/1024-8       2.05k ± 0%     2.05k ± 0%    ~     (all equal)

It'd be especially nice to internalize static slot, but as we can't compare
slices it's not possible.
This commit is contained in:
Roman Khimov 2021-11-30 15:03:01 +03:00
parent a0473aca92
commit ee05f73b6f
6 changed files with 54 additions and 66 deletions
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6
pkg/vm/slot_test.go
View file

@ -9,8 +9,8 @@ import (
)
func TestSlot_Get(t *testing.T) {
s := newSlot(newRefCounter())
require.NotNil(t, s)
rc := newRefCounter()
var s slot
require.Panics(t, func() { s.Size() })
s.init(3)
@ -20,6 +20,6 @@ func TestSlot_Get(t *testing.T) {
item := s.Get(2)
require.Equal(t, stackitem.Null{}, item)
s.Set(1, stackitem.NewBigInteger(big.NewInt(42)))
s.Set(1, stackitem.NewBigInteger(big.NewInt(42)), rc)
require.Equal(t, stackitem.NewBigInteger(big.NewInt(42)), s.Get(1))
}