Re: Dual-CPU slower then Single under HP? - Mailing list pgsql-hackers

From Tom Lane
Subject Re: Dual-CPU slower then Single under HP?
Date
Msg-id 3283.991850438@sss.pgh.pa.us
Whole thread Raw
In response to Dual-CPU slower then Single under HP?  (The Hermit Hacker <scrappy@hub.org>)
Responses Re: Dual-CPU slower then Single under HP?  (The Hermit Hacker <scrappy@hub.org>)
List pgsql-hackers
The Hermit Hacker <scrappy@hub.org> writes:
>     The 4m:30s is running one process for 100K inserts ... with two
> CPUs/processes, it increases the time to process by almost 40% ... ?

Do you mean two processes inserting into the same table?

I committed some changes recently that reduce the amount of contention
involved in that scenario, but it's not released yet.

Another fairly likely issue is the not-very-good implementation of
spinlocks.  We've talked about finding a way other than select() to
block on a spinlock, but no one's done anything about it yet...
        regards, tom lane


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