Re: Shared buffers, db transactions commited, and write IO on Solaris
| От | Erik Jones |
|---|---|
| Тема | Re: Shared buffers, db transactions commited, and write IO on Solaris |
| Дата | |
| Msg-id | 39BA9EF6-4928-4128-B4BB-A8DE2C536053@myemma.com обсуждение исходный текст |
| Ответ на | Re: Shared buffers, db transactions commited, and write IO on Solaris (Josh Berkus <josh@agliodbs.com>) |
| Ответы |
Re: Shared buffers, db transactions commited, and write IO on Solaris
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| Список | pgsql-performance |
On Mar 29, 2007, at 7:23 PM, Josh Berkus wrote:
Erik,Wow, thanks for the post.We've just started testing the option of sizing shared_buffers bigger thanthe database, and using forcedirectio in benchmarks at Sun. So far, ourexperience has been *equal* performance in that configuration, so it's*very* interesting to see you're getting a gain.----Josh
Josh,
You'er welcome! However, I believe our situation is very different from what you're testing if I understand you correctly. Are you saying that you're entire database will fit in memory? If so, then these are very different situations as there is no way ours could ever do that. In fact, I'm not sure that forcedirectio would really net you any gain in that situation as the IO service time will be basically nil if the filesystem cache doesn't have to page which I would think is why your seeing what you are.
erik jones <erik@myemma.com>
software developer
615-296-0838
emma(r)
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