Re: Removing more vacuumlazy.c special cases, relfrozenxid optimizations

Hi,

On 2022-03-30 21:11:48 -0700, Peter Geoghegan wrote:
> On Wed, Mar 30, 2022 at 9:04 PM Andres Freund <andres@anarazel.de> wrote:
> > (gdb) p vacrel->NewRelfrozenXid
> > $3 = 717
> > (gdb) p vacrel->relfrozenxid
> > $4 = 717
> > (gdb) p OldestXmin
> > $5 = 5112
> > (gdb) p aggressive
> > $6 = false
>
> Does this OldestXmin seem reasonable at this point in execution, based
> on context? Does it look too high? Something else?

Reasonable:
(gdb) p *ShmemVariableCache
$1 = {nextOid = 78969, oidCount = 2951, nextXid = {value = 21411}, oldestXid = 714, xidVacLimit = 200000714,
xidWarnLimit= 2107484361,
 
  xidStopLimit = 2144484361, xidWrapLimit = 2147484361, oldestXidDB = 1, oldestCommitTsXid = 0, newestCommitTsXid = 0,
latestCompletedXid= {value = 21408},
 
  xactCompletionCount = 1635, oldestClogXid = 714}

I think the explanation I just sent explains the problem, without "in-memory"
confusion about what's running and what's not.

Greetings,

Andres Freund