POV-Ray : Newsgroups : povray.general : Peak memory usage : Re: Peak memory usage Server Time: 29 Oct 2020 23:25:27 GMT
  Re: Peak memory usage  
From: Bill Pragnell
Date: 14 Sep 2020 22:10:00
Thorsten <tho### [at] trfde> wrote:
> It wasn't removed, the data is just no longer available in 3.7 and later
> because it used to be collected by a non-thread-safe addition and
> subtraction. Back when 3.7 was developed, there was no thread-safe AND
> portable way to do this.
>
> With the atomic integer functions in the newer STLs (C++ 2014 and
> forward, I think) that has been solved, but now this would require also
> overloading the default allocators for new and delete given most
> allocation works by way of the STL rather than malloc and free.


Aha, thank you, that's very informative. I hadn't realised POV-Ray kept count of
its own allocation, I think I'd assumed some system magic.

I had a brief look through the code, but I don't really know it well. So the
POV_MALLOC (et al) macros did the memory tracking, but this was turned off when
it became inaccurate for the multithreading, and now they've mostly been
replaced with new and delete?


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