| From: | Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com> |
|---|---|
| To: | Peter Geoghegan <pg(at)bowt(dot)ie> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Prabhat Sahu <prabhat(dot)sahu(at)enterprisedb(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>, Rafia Sabih <rafia(dot)sabih(at)enterprisedb(dot)com>, Ashutosh Bapat <ashutosh(dot)bapat(at)enterprisedb(dot)com>, Haribabu Kommi <kommi(dot)haribabu(at)gmail(dot)com>, Oleg Golovanov <rentech(at)mail(dot)ru> |
| Subject: | Re: Parallel Hash take II |
| Date: | 2017-09-25 06:08:25 |
| Message-ID: | CAEepm=1_VBFe3ePtf4kZz8b+TRgtqC6a9fHJC8FLVru55=P7xA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Sep 21, 2017 at 5:49 AM, Peter Geoghegan <pg(at)bowt(dot)ie> wrote:
> Graefe's "Query Evaluation Techniques for Large Databases" has several
> pages on deadlock avoidance strategies. It was written almost 25 years
> ago, but still has some good insights IMV (you'll recall that Graefe
> is the author of the Volcano paper; this reference paper seems like
> his follow-up). Apparently, deadlock avoidance strategy becomes
> important for parallel sort with partitioning. You may be able to get
> some ideas from there. And even if you don't, his handling of the
> topic is very deliberate and high level, which suggests that ours
> should be, too.
Very interesting and certainly relevant (the parts I've read so far),
though we don't have multiple consumers. Multiplexing one thread so
that it is both a consumer and a producer is an extra twist though.
--
Thomas Munro
http://www.enterprisedb.com
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