| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> |
| Cc: | maryedie(at)osdl(dot)org, pgsql-hackers(at)postgresql(dot)org, Mark Wong <markw(at)osdl(dot)org>, Josh Berkus <josh(at)agliodbs(dot)com>, Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
| Subject: | Re: data on devel code perf dip |
| Date: | 2005-08-12 01:38:22 |
| Message-ID: | 9736.1123810702@sss.pgh.pa.us |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers pgsql-patches |
Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org> writes:
> In light of this, may I ask whether it makes sense to compare the
> performance of two runs with similar shared_buffer settings? With
> O_DIRECT, I understand from this manpage that the OS is going to do
> little or no page caching, so shared_buffers should be increased to
> account for this fact.
> Am I missing something?
O_DIRECT is only being used for WAL page writes (or I sure hope so
anyway), so shared_buffers should be irrelevant.
regards, tom lane
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Bruce Momjian | 2005-08-12 01:40:39 | Re: data on devel code perf dip |
| Previous Message | Alvaro Herrera | 2005-08-12 01:31:12 | Re: data on devel code perf dip |
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Bruce Momjian | 2005-08-12 01:40:39 | Re: data on devel code perf dip |
| Previous Message | Alvaro Herrera | 2005-08-12 01:31:12 | Re: data on devel code perf dip |