Horton

Re: Wierd context-switching issue on Xeon

Josh Berkus <josh@agliodbs.com>

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From: Josh Berkus <josh@agliodbs.com>
To: pg@fastcrypt.com, Dirk_Lutzebäck <lutzeb@aeccom.com>
Cc: ohp@pyrenet.fr, Tom Lane <tgl@sss.pgh.pa.us>, Joe Conway <mail@joeconway.com>, "scott.marlowe" <scott.marlowe@ihs.com>, Bruce Momjian <pgman@candle.pha.pa.us>, pgsql-performance@postgresql.org, Neil Conway <neilc@samurai.com>
Date: 2004-04-21T17:29:43Z
Lists: pgsql-performance 
Dave,

> After some testing if you use the current head code for s_lock.c which
> has some mods in it to alleviate this situation, and change
> SPINS_PER_DELAY to 10 you can drastically reduce the cs with tom's test.
> I am seeing a slight degradation in throughput using pgbench -c 10 -t
> 1000 but it might be liveable, considering the alternative is unbearable
> in some situations.
>
> Can anyone else replicate my results?

Can you produce a patch against 7.4.1?   I'd like to test your fix against a 
real-world database.


-- 
Josh Berkus
Aglio Database Solutions
San Francisco