Re: Using Threads?

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: Tom Samplonius <tom(at)sdf(dot)com>
Cc: Junfeng Zhang <junfengz(at)cae(dot)wisc(dot)edu>, Thomas Lockhart <lockhart(at)alumni(dot)caltech(dot)edu>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Using Threads?
Date: 2000-12-09 05:25:16
Message-ID: 200012090525.AAA14797@candle.pha.pa.us
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>
> On Mon, 4 Dec 2000, Junfeng Zhang wrote:
>
> > All the major operating systems should have POSIX threads implemented.
> > Actually this can be configurable--multithreads or one thread.
>
> I don't understand this. The OS can be configured for one thread? How
> would that be any of use?
>
> > Thread-only server is unsafe, I agree. Maybe the following model can be a
> > little better. Several servers, each is multi-threaded. Every server can
> > support a maximum number of requests simultaneously. If anything bad
> > happends, it is limited to that server.
>
> There is no difference. If anything bad happens with the current
> multi-process server, all the postgres backends shutdown because the
> shared memory may be corrupted.

Yes. Are we adding reliability with per-process backends. I think so
because things are less likely to go haywire, and we are more likely to
be able to clean things up in a failure.

--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
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