Sharing memory buffers between separate C# processes with microsecond latency:

// Process A (Writer)
using var mmf = MemoryMappedFile.CreateOrOpen("Global\\MySharedData", 1024 * 1024);
using var accessor = mmf.CreateViewAccessor();
accessor.Write(0, 42);

// Process B (Reader)
using var mmfReader = MemoryMappedFile.OpenExisting("Global\\MySharedData");
using var readerAccessor = mmfReader.CreateViewAccessor();
int value = readerAccessor.ReadInt32(0);

Both processes read and write directly to the same physical RAM page frame backed by the OS virtual memory manager!

Memory mapped files provide the highest throughput possible for local IPC on Windows and Linux.

You can also obtain a byte* pointer via accessor.SafeMemoryMappedViewHandle.AcquirePointer for direct Span<T> wrapping!