RE: [PoC] Non-volatile WAL buffer

Dear hackers,

I made another WIP patchset to mmap WAL segments as WAL buffers. Note that this is not a non-volatile WAL buffer patchset but its competitor. I am measuring and analyzing the performance of this patchset to compare with my N.V.WAL buffer.

Please wait for a several more days for the result report...

Best regards,
Takashi

--
Takashi Menjo <takashi(dot)menjou(dot)vg(at)hco(dot)ntt(dot)co(dot)jp>
NTT Software Innovation Center

> -----Original Message-----
> From: Robert Haas <robertmhaas(at)gmail(dot)com>
> Sent: Wednesday, January 29, 2020 6:00 AM
> To: Takashi Menjo <takashi(dot)menjou(dot)vg(at)hco(dot)ntt(dot)co(dot)jp>
> Cc: Heikki Linnakangas <hlinnaka(at)iki(dot)fi>; pgsql-hackers(at)postgresql(dot)org
> Subject: Re: [PoC] Non-volatile WAL buffer
>
> On Tue, Jan 28, 2020 at 3:28 AM Takashi Menjo <takashi(dot)menjou(dot)vg(at)hco(dot)ntt(dot)co(dot)jp> wrote:
> > I think our concerns are roughly classified into two:
> >
> > (1) Performance
> > (2) Consistency
> >
> > And your "different concern" is rather into (2), I think.
>
> Actually, I think it was mostly a performance concern (writes triggering lots of reading) but there might be a
> consistency issue as well.
>
> --
> Robert Haas
> EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company