Horton

Re: 9.2beta1, parallel queries, ReleasePredicateLocks, CheckForSerializableConflictIn in the oprofile

Sergey Koposov <koposov@ast.cam.ac.uk>

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From: Sergey Koposov <koposov@ast.cam.ac.uk>
To: Stephen Frost <sfrost@snowman.net>
Cc: Robert Haas <robertmhaas@gmail.com>, Merlin Moncure <mmoncure@gmail.com>, Jeff Janes <jeff.janes@gmail.com>, pgsql-hackers@postgresql.org
Date: 2012-05-26T14:58:42Z
Lists: pgsql-hackers

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  1. Improve bulk-insert performance by keeping the current target buffer pinned

On Sat, 26 May 2012, Stephen Frost wrote:

> Alright, can you just time 'cat' when they're started a few seconds or
> whatever apart from each other?  I can't imagine it being affected in
> the same way as these, but seems like it wouldn't hurt to check.

I've tryed cat'ting a created in advance 8gig file on the same filesystem.
And  during the multi-threaded run it takes ~4sec, roughly the same as 
when run separately.


*****************************************************
Sergey E. Koposov, PhD, Research Associate
Institute of Astronomy, University of Cambridge
Madingley road, CB3 0HA, Cambridge, UK
Tel: +44-1223-337-551 Web: http://www.ast.cam.ac.uk/~koposov/