| From: | Josh Berkus <josh(at)agliodbs(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Checkpoint cost, looks like it is WAL/CRC |
| Date: | 2005-07-22 23:29:57 |
| Message-ID: | 200507221629.57515.josh@agliodbs.com |
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| Lists: | pgsql-hackers |
Tom,
> There's something awfully weird going on here. I was prepared to see
> no statistically-significant differences, but not multiple cases that
> seem to be going the "wrong direction".
There's a lot of variance in the tests. I'm currently running a variance
test battery on one machine to figure out why the results become so
variable when checkpointing is < 1 hour.
Actually, to cover all which is currently running:
machine1 & 3 wal_buffers scaling test
machine2 STP variance test
machine4 full_page_writes=false test
All of these should wind up in about 5 days, provided the STP doesn't crash
(not an insignificant concern).
--
--Josh
Josh Berkus
Aglio Database Solutions
San Francisco
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