Re: CLOG contention
| От | Robert Haas |
|---|---|
| Тема | Re: CLOG contention |
| Дата | |
| Msg-id | CA+TgmoagzcQR69nSRDHygSggfJiKLWFhunw=uToZga5bWw5SiA@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: CLOG contention ("Kevin Grittner" <Kevin.Grittner@wicourts.gov>) |
| Ответы |
Re: CLOG contention
|
| Список | pgsql-hackers |
On Thu, Jan 5, 2012 at 2:44 PM, Kevin Grittner <Kevin.Grittner@wicourts.gov> wrote: > If we go with such a formula, I think 32 MB would be a more > appropriate divisor than 128 MB. Even on very large machines where > 32 CLOG buffers would be a clear win, we often can't go above 1 or 2 > GB of shared_buffers without hitting latency spikes due to overrun > of the RAID controller cache. (Now, that may change if we get DW > in, but that's not there yet.) 1 GB / 32 is 32 MB. This would > leave CLOG pinned at the minimum of 8 buffers (64 KB) all the way up > to shared_buffers of 256 MB. That seems reasonable to me. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company
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