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SIMD-accelerated gas mixtures. (SIMD atmos) (#2479)

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* SIMD atmos

* Moles will always be a multiple of four.

* Component dependencies for grid atmos.

* Let's optimize allocations while we're at it!

* Inline this

* A bunch of atmos optimizations

* Fix crimes against atmos

* Microsoft moment

* Remove nuget.config

* do not reference Robust.UnitTests in Content.Benchmarks as it's unneeded.

* Revert "Remove nuget.config"

This reverts commit 872604ae6a51365af4075bb23687bd005befd8ac.

* Gas overlay optimization and fixes

* Lattice is now spess

* minor atmos tweaks
This commit is contained in:
Víctor Aguilera Puerto
2020-11-25 10:48:49 +01:00
committed by GitHub
parent 89f72c4cb2
commit b18ee3ec49
19 changed files with 199 additions and 177 deletions
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109
Content.Server/Atmos/GasMixture.cs
View File

@@ -9,6 +9,7 @@ using Content.Server.Interfaces;
using Content.Shared.Atmos;
using Robust.Shared.GameObjects.Systems;
using Robust.Shared.Interfaces.Serialization;
using Robust.Shared.Maths;
using Robust.Shared.Serialization;
using Robust.Shared.ViewVariables;
@@ -24,11 +25,12 @@ namespace Content.Server.Atmos
public static GasMixture SpaceGas => new GasMixture() {Volume = 2500f, Immutable = true, Temperature = Atmospherics.TCMB};
// This must always have a length that is a multiple of 4 for SIMD acceleration.
[ViewVariables]
private float[] _moles = new float[Atmospherics.TotalNumberOfGases];
private float[] _moles;
[ViewVariables]
private float[] _molesArchived = new float[Atmospherics.TotalNumberOfGases];
private float[] _molesArchived;
[ViewVariables]
private float _temperature = Atmospherics.TCMB;
@@ -54,46 +56,10 @@ namespace Content.Server.Atmos
[MethodImpl(MethodImplOptions.AggressiveInlining)]
get
{
var capacity = 0f;
Span<float> tmp = stackalloc float[_moles.Length];
NumericsHelpers.Multiply(_moles, _atmosphereSystem.GasSpecificHeats, tmp);
for (var i = 0; i < Atmospherics.TotalNumberOfGases; i++)
{
capacity += _atmosphereSystem.GetGas(i).SpecificHeat * _moles[i];
}
return MathF.Max(capacity, Atmospherics.MinimumHeatCapacity);
}
}
/// <summary>
/// Heat capacity ratio of gas mixture
/// </summary>
[ViewVariables]
public float HeatCapacityRatio
{
get
{
var delimiterSum = 0f;
for (var i = 0; i < Atmospherics.TotalNumberOfGases; i++)
{
delimiterSum += _moles[i] / (_atmosphereSystem.GetGas(i).HeatCapacityRatio - 1);
}
return 1 + TotalMoles / delimiterSum;
}
}
public float MolarMass
{
get
{
var molarMass = 0f;
var totalMoles = TotalMoles;
for (var i = 0; i < Atmospherics.TotalNumberOfGases; i++)
{
molarMass += _atmosphereSystem.GetGas(i).MolarMass * (_moles[i] / totalMoles);
}
return molarMass;
return MathF.Max(NumericsHelpers.HorizontalAdd(tmp), Atmospherics.MinimumHeatCapacity);
}
}
@@ -103,14 +69,10 @@ namespace Content.Server.Atmos
[MethodImpl(MethodImplOptions.AggressiveInlining)]
get
{
var capacity = 0f;
Span<float> tmp = stackalloc float[_moles.Length];
NumericsHelpers.Multiply(_molesArchived, _atmosphereSystem.GasSpecificHeats, tmp);
for (var i = 0; i < Atmospherics.TotalNumberOfGases; i++)
{
capacity += _atmosphereSystem.GetGas(i).SpecificHeat * _molesArchived[i];
}
return MathF.Max(capacity, Atmospherics.MinimumHeatCapacity);
return MathF.Max(NumericsHelpers.HorizontalAdd(tmp), Atmospherics.MinimumHeatCapacity);
}
}
@@ -118,17 +80,7 @@ namespace Content.Server.Atmos
public float TotalMoles
{
[MethodImpl(MethodImplOptions.AggressiveInlining)]
get
{
var moles = 0f;
foreach (var gas in _moles)
{
moles += gas;
}
return moles;
}
get => NumericsHelpers.HorizontalAdd(_moles);
}
[ViewVariables]
@@ -168,7 +120,7 @@ namespace Content.Server.Atmos
public GasMixture(AtmosphereSystem? atmosphereSystem)
{
_atmosphereSystem = atmosphereSystem ?? EntitySystem.Get<AtmosphereSystem>();
_moles = new float[_atmosphereSystem.Gases.Count()];
_moles = new float[MathHelper.NextMultipleOf(Atmospherics.TotalNumberOfGases, 4)];
_molesArchived = new float[_moles.Length];
}
@@ -207,10 +159,7 @@ namespace Content.Server.Atmos
}
}
for (var i = 0; i < Atmospherics.TotalNumberOfGases; i++)
{
_moles[i] += giver._moles[i];
}
NumericsHelpers.Add(_moles, giver._moles);
}
[MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -268,19 +217,10 @@ namespace Content.Server.Atmos
var removed = new GasMixture(_atmosphereSystem) {Volume = Volume, Temperature = Temperature};
for (var i = 0; i < Atmospherics.TotalNumberOfGases; i++)
{
var moles = _moles[i];
if (moles < Atmospherics.GasMinMoles)
removed._moles[i] = 0f;
else
{
var removedMoles = moles * ratio;
removed._moles[i] = removedMoles;
if (!Immutable)
_moles[i] -= removedMoles;
}
}
_moles.CopyTo(removed._moles.AsSpan());
NumericsHelpers.Multiply(removed._moles, ratio);
if (!Immutable)
NumericsHelpers.Sub(_moles, removed._moles);
return removed;
}
@@ -563,25 +503,24 @@ namespace Content.Server.Atmos
public void Multiply(float multiplier)
{
if (Immutable) return;
for(var i = 0; i < Atmospherics.TotalNumberOfGases; i++)
{
_moles[i] *= multiplier;
}
NumericsHelpers.Multiply(_moles, multiplier);
}
public void ExposeData(ObjectSerializer serializer)
{
var length = MathHelper.NextMultipleOf(Atmospherics.TotalNumberOfGases, 4);
serializer.DataField(this, x => Immutable, "immutable", false);
serializer.DataField(this, x => Volume, "volume", 0f);
serializer.DataField(this, x => LastShare, "lastShare", 0f);
serializer.DataField(this, x => TemperatureArchived, "temperatureArchived", 0f);
serializer.DataField(ref _moles, "moles", new float[Atmospherics.TotalNumberOfGases]);
serializer.DataField(ref _molesArchived, "molesArchived", new float[Atmospherics.TotalNumberOfGases]);
serializer.DataField(ref _moles, "moles", new float[length]);
serializer.DataField(ref _molesArchived, "molesArchived", new float[length]);
serializer.DataField(ref _temperature, "temperature", Atmospherics.TCMB);
// The arrays MUST have a specific length.
Array.Resize(ref _moles, Atmospherics.TotalNumberOfGases);
Array.Resize(ref _molesArchived, Atmospherics.TotalNumberOfGases);
Array.Resize(ref _moles, length);
Array.Resize(ref _molesArchived, length);
}
public override bool Equals(object? obj)