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From GitBox <...@apache.org>
Subject [GitHub] [lucenenet] theolivenbaum commented on issue #346: Remove Debugging.AssertsEnabled
Date Sat, 17 Oct 2020 16:49:58 GMT

theolivenbaum commented on issue #346:
URL: https://github.com/apache/lucenenet/issues/346#issuecomment-711044655


   @NightOwl888  I'm reviewing my previous benchmarks on our usage of Lucene today, and I
think my initial conclusion on Debugging.AssertsEnabled being the cause of the "slowness"
of FixedBitSet.Set / Get is actually incorrect.
   
   Using dotMemory now to measure memory allocations, one can clearly see that there is a
lambda capture being allocated on every call to the FixedBitSet.Set / Get methods.
   ![image](https://user-images.githubusercontent.com/8791811/96348382-9d078d00-10a8-11eb-8f0c-afb7dfdc7ea5.png)
   
   This can also be seen on [SharpLab](https://sharplab.io/#v2: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)
if we look at the decompiled C# code:
   
   `````csharp
   public class FixedBitSet
   {
       [CompilerGenerated]
       private sealed class <>c__DisplayClass3_0
       {
           public int index;
   
           public FixedBitSet <>4__this;
   
           internal string <Set>b__0()
           {
               return "index=" + index + ", numBits=" + <>4__this.numBits;
           }
       }
   
       internal readonly long[] bits;
   
       internal readonly int numBits;
   
       internal readonly int numWords;
   
       public void Set(int index)
       {
           <>c__DisplayClass3_0 <>c__DisplayClass3_ = new <>c__DisplayClass3_0();
   <------ unnecessary allocation, probably due to the capture of numBits
           <>c__DisplayClass3_.index = index;
           <>c__DisplayClass3_.<>4__this = this;
           if (Debugging.AssertsEnabled)
           {
               Debugging.Assert(<>c__DisplayClass3_.index >= 0 && <>c__DisplayClass3_.index
< numBits, new Func<string>(<>c__DisplayClass3_.<Set>b__0));
           }
           int num = <>c__DisplayClass3_.index >> 6;
           int num2 = <>c__DisplayClass3_.index & 0x3F;
           long num3 = 1L << num2;
           bits[num] |= num3;
       }
   }
   `````
   
   
   @NightOwl888 I'll push a pull request with only the fix for this asap
   
   


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