Update ReadMe to comment on relative performance difference between C# and C++ about faster

[badrishc]

Good points, yes adv-file-ops may be possible to eliminate. We actually need to convert the IDevice implementation (the main user of adv-file-ops) to be platform agnostic without losing perf when on Windows, i.e., continue to use the native Windows API as we do currently, in that setting. Would be nice to see a pull request for this.

As for, readtsc, actually it is not required in core at all: it was used only for latency testing because Stopwatch was too slow when measuring latency of individual ops. I will move readtsc to benchmark/eliminate it entirely.

[jahunter-m]

Good suggestion, thanks. Performance between C++ and C# versions is effectively the same. So far, we have not discovered a technique that works in C++ that we have not been able to implement in C#.

[jahunter-m]

We should add that to the README, as you suggest.

[kasajian]

That's actually very useful to know -- thanks for the prompt feedback.

[dzmitry-lahoda]

Could it be possible to eliminate C++ code?

1. https://github.com/Microsoft/FASTER/blob/master/cs/src/native/adv-file-ops/adv-file-ops.cpp

Via https://twitter.com/xoofx/status/1031645672821469187

2. https://github.com/Microsoft/FASTER/blob/master/cs/src/native/readtsc/readtsc.cpp

I guess need to create issue request for

https://github.com/dotnet/corefx/tree/master/src/Common/src/CoreLib/System/Runtime/Intrinsics/X86

[badrishc]

Updated README, closing.

[vibeeshan025]

Is it true to mac OS as well, When i run the provided sample project in mac, everything is working except (at least there is no any exception), i didn't see any file on the disk.