Created
May 15, 2017 11:52
-
-
Save vgrudenic/c0617744748253be20260aacfe22aaf5 to your computer and use it in GitHub Desktop.
Comparing struct/class access with shuffled arrays
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
using System; | |
using UnityEngine; | |
class TestScript : MonoBehaviour | |
{ | |
struct ProjectileStruct | |
{ | |
public Vector3 Position; | |
public Vector3 Velocity; | |
} | |
class ProjectileClass | |
{ | |
public Vector3 Position; | |
public Vector3 Velocity; | |
} | |
void Start() | |
{ | |
const int count = 10000000; | |
ProjectileStruct[] projectileStructs = new ProjectileStruct[count]; | |
ProjectileClass[] projectileClasses = new ProjectileClass[count]; | |
for (int i = 0; i < count; ++i) | |
{ | |
projectileClasses[i] = new ProjectileClass(); | |
} | |
Shuffle(projectileStructs); | |
Shuffle(projectileClasses); | |
// create an array of shuffled indices | |
int[] indices = new int[count]; | |
for (int i = 0; i < count; i++) | |
{ | |
indices[i] = i; | |
} | |
Shuffle(indices); | |
System.Diagnostics.Stopwatch sw = System.Diagnostics.Stopwatch.StartNew(); | |
for (int i = 0; i < count; ++i) | |
{ | |
UpdateProjectile(ref projectileStructs[indices[i]], 0.5f); | |
} | |
long structTime = sw.ElapsedMilliseconds; | |
sw.Reset(); | |
sw.Start(); | |
for (int i = 0; i < count; ++i) | |
{ | |
UpdateProjectile(projectileClasses[indices[i]], 0.5f); | |
} | |
long classTime = sw.ElapsedMilliseconds; | |
string report = string.Format( | |
"Type,Time\n" + | |
"Struct,{0}\n" + | |
"Class,{1}\n", | |
structTime, | |
classTime | |
); | |
Debug.Log(report); | |
} | |
void UpdateProjectile(ref ProjectileStruct projectile, float time) | |
{ | |
projectile.Position += projectile.Velocity * time; | |
} | |
void UpdateProjectile(ProjectileClass projectile, float time) | |
{ | |
projectile.Position += projectile.Velocity * time; | |
} | |
public static void Shuffle<T>(T[] list) | |
{ | |
System.Random random = new System.Random(); | |
for (int n = list.Length; n > 1; ) | |
{ | |
n--; | |
int k = random.Next(n + 1); | |
T value = list[k]; | |
list[k] = list[n]; | |
list[n] = value; | |
} | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment