Re: Free WAL caches on switching segments

Tom Lane  wrote:

> > Here is a small patch to prevent undesired WAL file caching by kernel.
> > posix_fadvise(POSIX_FADV_DONTNEED) attempts to free cached pages and
> > the kernel will discard them in preference to other data caches.
> 
> On plenty of platforms, this won't even compile ...


Do you mean simply following code? or more pretty way?

#ifdef POSIX_FADV_DONTNEED
	posix_fadvise(openLogFile, 0, 0, POSIX_FADV_DONTNEED);
#endif


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ITAGAKI Takahiro
NTT Cyber Space Laboratories