Re: Use fadvise in wal replay

> On 23 Jun 2022, at 12:50, Jakub Wartak <jakub.wartak@tomtom.com> wrote:
>
> Thoughts?

I've looked into the patch one more time. And I propose to change this line
+        posix_fadvise(readFile, readOff + RACHUNK, RACHUNK, POSIX_FADV_WILLNEED);
to
+        posix_fadvise(readFile, readOff + XLOG_BLCKSZ, RACHUNK, POSIX_FADV_WILLNEED);

Currently first 128Kb of the file are not prefetched. But I expect that this change will produce similar performance
results.I propose this change only for consistency, so we prefetch all data that we did not prefetch yet and going to
read.What do you think? 

Best regards, Andrey Borodin.