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But this mostly benefits programs that let the. NET have really started to optimize String and certain array operations by taking advantage of things like SIMD/SSE/AVX ISA extensions. Also, Parallel.For does not support multidimensional arrays btw.You also can't share the StringBuilder between threads - so each thread can only produce a substring from its own chunk of the array, so at the end you'll be left with N-many String values (from N-many threads) that you'll need to concatenate (and in the right order too!), which will basically be just as expensive as doing it in a single thread.Using multiple threads will be slower because there is significant overhead to kicking-off a multi-threaded, shared-memory workflow - such as needing to allocate megabytes of RAM for each new thread for each thread's default stack size and thread-local state.This implementation is single-threaded, which will be faster than using multiple-threads for arrays sized below some threshold (and I have no idea what that threshold is - it could be a few hundred KB - or as high as tens of megabytes - it all depends on your machine). NET Framework 4.x) you might want to consider instead using 1-dimensional arrays with some trivial extension-methods that convert 2D array indexes to a flat index - and vice-versa.

NET 7 or higher (like us poor sods stuck in the dead-end of the.

But eventually they fixed it only about a year ago and it shipped in.

NET's true multidimensional arrays ( T, T, as opposed to Java-style jagged-arrays) have always inexplicitly had poor performance compared to 1-dimensional T arrays. (Running it in RELEASE mode didn't improve performance for me at all, interestingly).įor what seems like forever. NET 7 in DEBUG mode on my (now somewhat aged) desktop in Linqpad the Stopwatch sw says it took 0.78ms (less than 1 millisecond) to render the Char to a String.

Int32 rndCharValue = 0x32 + rng.Next( maxValue: 0x4C ) so we use the range 0x32 to 0x7E - or rather 0x00 to 0x4C, then add 0x32 to it: Char values are not 0x00 to 0x7F, because we don't want to print control-chars to stdout. Random rng = new Random( Seed: 55378008 ) StringBuilder sb = new StringBuilder( capacity: w * h ) If( input2DCharArray is null ) throw new ArgumentNullException(nameof(input2DCharArray)) Public static String Flatten( Char input2DCharArray ) String asString = Flatten( input2DCharArray ) Ĭonsole.WriteLine( 'Took ms to render the 2D array to a string.', sw.Elapsed.TotalMilliseconds ) Something like the Flatten function here: static void Main()Ĭhar input2DCharArray = CreateSampleData() Var span = TwoDimensionalArrayAsSpan(buffer) Then creating the span would look like: // Create the span. Ref Unsafe.As(ref MemoryMarshal.GetArrayDataReference(array)),

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You might like to write a separate method to convert 2D arrays of any type to make the code more readable: public static ReadOnlySpan TwoDimensionalArrayAsSpan(T array)

However, the data will be copied once in the call to new string(span), but the implementation uses a very fast copy. Note that creating a span in the code above does NOT copy any data. Show that the string contains the correct data. I think this will be one of the more performant approaches: var buffer = new char įor (int i = 0 i (ref MemoryMarshal.GetArrayDataReference(buffer)), You can use MemoryMarshal.CreateSpan() to create a ReadOnlySpan from a 2D char array, and then you can pass that span to the string constructor. public static string ExportBuffer(int Buffer, int Line, int Dimension = 2, int Start = 0, int End = 255)ĭefault: throw new NotImplementedException('The buffer selected does not exist.') The ~950ms measurement is for the ExtractA() function, with the other buffers taking a reasonable amount of time, but optimization would also be appreciated.

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The full context of the code snippet above. I'm trying to extract all elements of a 2D array and place them into a string, so far the code completes in an average of ~950ms but I was wondering if there's any faster way of doing this.Īll the buffers are 256x256 char arrays.

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