Re: Estimating HugePages Requirements?

On 8/31/21, 11:54 PM, "Michael Paquier" <michael(at)paquier(dot)xyz> wrote:
> Hmm. I am not sure about the addition of huge_pages_required, knowing
> that we would have shared_memory_size. I'd rather let the calculation
> part to the user with a scan of /proc/meminfo.

I included this based on some feedback from Andres upthread [0]. I
went ahead and split the patch set into 3 pieces in case we end up
leaving it out.

> +#elif defined(WIN32)
> + hp_size = GetLargePageMinimum();
> +#endif
> +
> +#if defined(MAP_HUGETLB) || defined(WIN32)
> + hp_required = (size_b / hp_size) + 1;
> As of [1], there is the following description:
> "If the processor does not support large pages, the return value is
> zero."
> So there is a problem here.

I've fixed this in v4.

Nathan

[0] https://postgr.es/m/20210827193813.oqo5lamvyzahs35o%40alap3.anarazel.de