|From:||Jaime Casanova <jcasanov(at)systemguards(dot)com(dot)ec>|
|To:||Heikki Linnakangas <hlinnaka(at)iki(dot)fi>|
|Cc:||vignesh C <vignesh21(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Peter Geoghegan <pg(at)bowt(dot)ie>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>|
|Subject:||Re: Polyphase merge is obsolete|
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On Sat, Sep 11, 2021 at 01:35:27AM -0500, Jaime Casanova wrote:
> On Wed, Jul 14, 2021 at 06:04:14PM +0300, Heikki Linnakangas wrote:
> > On 14/07/2021 15:12, vignesh C wrote:
> > > On Sat, Jan 23, 2021 at 3:49 AM Heikki Linnakangas <hlinnaka(at)iki(dot)fi> wrote:
> > > > Here's an updated version that fixes one bug:
> > > >
> > > > The CFBot was reporting a failure on the FreeBSD system . It turned
> > > > out to be an out-of-memory issue caused by an underflow bug in the
> > > > calculation of the size of the tape read buffer size. With a small
> > > > work_mem size, the memory left for tape buffers was negative, and that
> > > > wrapped around to a very large number. I believe that was not caught by
> > > > the other systems, because the other ones had enough memory for the
> > > > incorrectly-sized buffers anyway. That was the case on my laptop at
> > > > least. It did cause a big slowdown in the 'tuplesort' regression test
> > > > though, which I hadn't noticed.
> > > >
> > > > The fix for that bug is here as a separate patch for easier review, but
> > > > I'll squash it before committing.
> > >
> > > The patch does not apply on Head anymore, could you rebase and post a
> > > patch. I'm changing the status to "Waiting for Author".
> > Here's a rebased version. I also squashed that little bug fix from previous
> > patch set.
> This patch does not apply, can you submit a rebased version?
BTW, I'm marking this one as "waiting on author"
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