| From: | Dilip Kumar <dilipbalaut(at)gmail(dot)com> |
|---|---|
| To: | Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> |
| Cc: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Mahendra Singh <mahi6run(at)gmail(dot)com>, Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, Robert Haas <robertmhaas(at)gmail(dot)com>, Haribabu Kommi <kommi(dot)haribabu(at)gmail(dot)com>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp>, David Steele <david(at)pgmasters(dot)net>, Claudio Freire <klaussfreire(at)gmail(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Pavan Deolasee <pavan(dot)deolasee(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] Block level parallel vacuum |
| Date: | 2019-10-31 06:03:33 |
| Message-ID: | CAFiTN-tyeJfbfqW1xcCDOmhXMd5ORXFKSaypV_D89-C=Ouyg9w@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Oct 29, 2019 at 1:59 PM Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> wrote:
> Actually after increased shared_buffer I got expected results:
>
> * Test1 (after increased shared_buffers)
> normal : 2807 ms (hit 56295, miss 2, dirty 3, total 56300)
> 2 workers : 2840 ms (hit 56295, miss 2, dirty 3, total 56300)
> 1 worker : 2841 ms (hit 56295, miss 2, dirty 3, total 56300)
>
> I updated the patch that computes the total cost delay shared by
> Dilip[1] so that it collects the number of buffer hits and so on, and
> have attached it. It can be applied on top of my latest patch set[1].
I tried to repeat the test to see the IO delay with
v32-0004-PoC-shared-vacuum-cost-balance.patch [1]. I tried with
shared memory 4GB. I recreated the database and restarted the server
before each run. But, I could not see the same I/O delay and cost is
also not the same. Can you please tell me how much shared buffers did
you set?
Test1 (4GB shared buffers)
normal: stats delay 1348.160000, hit 68952, miss 2, dirty 10063,
total 79017
1 worker: stats delay 1821.255000, hit 78184, miss 2, dirty 14095, total 92281
2 workers: stats delay 2224.415000, hit 86482, miss 2, dirty 17665, total 104149
--
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com
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