Re: else ladders practice

On 25/11/2024 21:29, Scott Lurndal wrote:

Bart <bc@freeuk.com> writes:

On 25/11/2024 18:49, Tim Rentsch wrote:

 

>
I'm trying to think of some computationally intensive app that would run
non-stop for several hours without interaction.

 I can think of several - HDL simulators (vcs, et al), system simulators
like Simh, Qemu, Synopsys Virutalizer, SIMICS, most HPC codes (e.g. fluid dynamics)
Machine Learning training, et alia.

OK, good.
So the only preparation you have to do to get those running at maximum speed is just to use -O3 on your compilers instead of -O0.
Understood. You don't need to need to worry about anything else.
However I assume that has already been done when building products like LLVM (which apparently takes somewhat longer then one second to build), however I keep seeing comments about it like this:
"I think the biggest complaint is compile time."
"but if you want fast compile times or just "O1" instead of "O3" level performance, it can feel like overkill."
"ah this seems like two very different use cases. Stating the obvious: when debugging I want as fast builds as possible. When shipping I want as fast software as possible."
Apparently this is not obvious to anybody here except me!