C#•2y ago

❔ Optimization thoughts on a loop.

Looking for potential ways to speed up this operation. Any thoughts? The entries of each HashSet will change regularly and this is iterated frequently.

    public class MyClass { }
    //This will aways have 4 entries.
    private List<HashSet<MyClass>> _regions = new List<HashSet<MyClass>>();
    private void Test()
    {

        for (int i = 0; i < 2000; i++)
        {
            CheckIndex(0);
            if (i % 2 == 0)
                CheckIndex(1);
            if (i % 3 == 0)
                CheckIndex(2);
            if (i % 4 == 0)
                CheckIndex(3);
        }

        //Logic
        void CheckIndex(int index)
        {
            HashSet<MyClass> classes = _regions[index];
            //do things to classes.
        }
    }

    public class MyClass { }
    //This will aways have 4 entries.
    private List<HashSet<MyClass>> _regions = new List<HashSet<MyClass>>();
    private void Test()
    {

        for (int i = 0; i < 2000; i++)
        {
            CheckIndex(0);
            if (i % 2 == 0)
                CheckIndex(1);
            if (i % 3 == 0)
                CheckIndex(2);
            if (i % 4 == 0)
                CheckIndex(3);
        }

        //Logic
        void CheckIndex(int index)
        {
            HashSet<MyClass> classes = _regions[index];
            //do things to classes.
        }
    }

5 Replies

canton7•2y ago

Which bit specifically are you looking to speed up? The only things that are actually in the code you posted are a loop, a modulo, and an array access. All of those are pretty fast

phaseshift•2y ago

Have you benchmarked the general code? Are you sure this is a hotspot? This reeks of premature optimisation

FirstGearGames•2y ago

I'm just curious if there's something that sounds out as 'could be better' double checking my work

phaseshift•2y ago

well, if i%4==0 theres no point in checking i%2

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Optimization thoughts on a loop.