test mormot.core.base.pas MoveFast speed

[dbyoung720]

I test mormot.core.base.pas MoveFast function,
this https://github.com/skywind3000/FastMemcpy.git is faster on Delphi11.
platform: Window10 x64 + VS2019

[synopse]

How much faster is it?
It is likely to be faster, but this code is much more verbose, and it is written in C.

I don't see any benefit in using it for mormot.core.base in practice. Putting much more asm many not be ideal.
I doubt it may change anything on real processing, because most benchmarks are working within the cache, or tricking the CPUs. They are typical unrealistic benchmarks. Does it change anything e.g. for the multi-threading tests of our HTTP process?

Please use our forum to discuss this.
https://synopse.info/forum

[synopse]

Please see my remarks at https://synopse.info/forum/viewtopic.php?pid=36144#p36144

The main argument against its integration are

1. its size: 120KB instead of 671 bytes, which pollute the CPU opcache for sure.
2. the lower speed on small blocks, which occur very often on production code (mainly for strings).
3. overuse of prefetch.

So please try it on mormot2tests and report back in the forum.