| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
| Cc: | Hans-Jürgen Schönig <hs(at)cybertec(dot)at>, pgsql-hackers(at)postgresql(dot)org, peter_e(at)gmx(dot)net |
| Subject: | Re: PostgreSQL 7.3.3 and Intel C compiler |
| Date: | 2003-07-22 18:15:21 |
| Message-ID: | 8812.1058897721@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> But the snapshots only are grabbing the xids from each proc, right?
> Doesn't seem that would take very long.
Yeah, we've never seen any previous indication that grabbing a snapshot
is a bottleneck. Also, I think it uses a shared (read) lock, so there
shouldn't really be contention, unless perhaps they are starting and
stopping backends very frequently as well.
> If this is the bottleneck, maybe we need a shared proc lock.
We need to understand what's happening before speculating about how to
fix it ...
regards, tom lane
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