| From: | "Chad Wagner" <chad(dot)wagner(at)gmail(dot)com> |
|---|---|
| To: | gene(at)sotech(dot)us |
| Cc: | "Bruce Momjian" <bruce(at)momjian(dot)us>, "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org, "Hideyuki Kawashima" <kawasima(at)cs(dot)tsukuba(dot)ac(dot)jp> |
| Subject: | Re: Acclerating INSERT/UPDATE using UPS |
| Date: | 2007-02-13 00:00:29 |
| Message-ID: | 81961ff50702121600p76d9b91w6354aba3e710ec8e@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 2/12/07, Gene <genekhart(at)gmail(dot)com> wrote:
>
> I was curious to see how postgres would perform with wal on a tmpfs vs
> disk here are some numbers I got from pgbench. Let me know if I did
> something stupid, this is the first time I've used pgbench. The wal on tmpfs
> method is not significantly faster.
>
tmpfs uses virtual memory, so it is likely hitting the disk. I would try
and repeat your cases with ramfs, which uses real memory. Testing shows
that just putting pg_xlog on ramfs yields a 30% boost in performance over
disk with a stock configuration. So there is room for improvement, I am
sure.
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