Thread: increase performancr with "noatime"?
would it cause problem in postgres DB if /var/lib/psql partition is mounted with "noatime"? TIA JM
On Tue, Sep 09, 2003 at 04:12:48PM +0800, JM wrote:
> would it cause problem in postgres DB if /var/lib/psql partition is mounted
> with "noatime"?
No; in fact, that's been suggested by many people. I don't know
whether anyone's done any tests to prove that it helps.
A
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Andrew Sullivan 204-4141 Yonge Street
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Andrew Sullivan wrote: > On Tue, Sep 09, 2003 at 04:12:48PM +0800, JM wrote: > >>would it cause problem in postgres DB if /var/lib/psql partition is mounted >>with "noatime"? > > > No; in fact, that's been suggested by many people. I don't know > whether anyone's done any tests to prove that it helps. http://www.potentialtech.com/wmoran/postgresql.php#results You can see, from my _limited_ testing, that it doesn't seem to help enough to be worth worrying about. In this test, it actually seems to hurt performance. Read the whole page, though. These tests are heavy on the writing, it's quite possible that it could improve things if your database is a heavy read scenerio. -- Bill Moran Potential Technologies http://www.potentialtech.com
>>>>> "AS" == Andrew Sullivan <andrew@libertyrms.info> writes: AS> On Tue, Sep 09, 2003 at 04:12:48PM +0800, JM wrote: >> would it cause problem in postgres DB if /var/lib/psql partition is mounted >> with "noatime"? AS> No; in fact, that's been suggested by many people. I don't know AS> whether anyone's done any tests to prove that it helps. I honestly can't expect it to be much of an improvement since the number of files involved compared with the size of the files is minimal. However, if you're opening/closing the files often it might cause you problems. I think in the normal case where it does matter you have pooled connections so the open/close happens rarely. Of course, if I had a good synthetic workload to pound on my DB, I'd run a test... Sean? -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Vivek Khera, Ph.D. Khera Communications, Inc. Internet: khera@kciLink.com Rockville, MD +1-240-453-8497 AIM: vivekkhera Y!: vivek_khera http://www.khera.org/~vivek/