Re: Estimating HugePages Requirements?

On 9/6/21, 9:00 PM, "Michael Paquier" <michael(at)paquier(dot)xyz> wrote:
> + sprintf(buf, "%lu MB", size_mb);
> + SetConfigOption("shared_memory_size", buf, PGC_INTERNAL, PGC_S_OVERRIDE);
> One small-ish comment about 0002: there is no need to add the unit
> into the buffer set as GUC_UNIT_MB would take care of that. The patch
> looks fine.

I fixed this in v7.

> +#ifndef WIN32
> +#include <sys/mman.h>
> +#endif
> So, this is needed in ipci.c to check for MAP_HUGETLB. I am not much
> a fan of moving around platform-specific checks when these have
> remained local to each shmem implementation. Could it be cleaner to
> add GetHugePageSize() to win32_shmem.c and make it always declared in
> the SysV implementation?

I don't know if it's really all that much cleaner, but I did it this
way in v7. IMO it's a little weird that GetHugePageSize() doesn't
return the value from GetLargePageMinimum(), but that's what we'd need
to do to avoid setting huge_pages_required for Windows without any
platform-specific checks.

Nathan