| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Josh Berkus <josh(at)agliodbs(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Gregory Stark <stark(at)enterprisedb(dot)com>, jd(at)commandprompt(dot)com, Martijn van Oosterhout <kleptog(at)svana(dot)org>, Jacky Leng <lengjianquan(at)163(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Has anybody think about changing BLCKSZ to an option of initdb? |
| Date: | 2009-03-14 20:27:03 |
| Message-ID: | 20090314202703.GB5624@alvh.no-ip.org |
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| Thread: | |
| Lists: | pgsql-hackers |
Josh Berkus wrote:
> However, at Greenplum I remember determining that larger PG block sizes,
> if matched with larger filesystem block sizes did significantly help on
> performance of data warehouses which do a lot of seq scans -- but that
> our ceiling of 32K was still too small to really make this work. I
> don't have the figures for that, though; Luke reading this?
And did they study the effect of tuning the kernel's readahead?
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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