| From: | Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru> |
|---|---|
| To: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Merlin Moncure <mmoncure(at)gmail(dot)com>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, YUriy Zhuravlev <u(dot)zhuravlev(at)postgrespro(dot)ru>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Move PinBuffer and UnpinBuffer to atomics |
| Date: | 2016-04-10 05:40:38 |
| Message-ID: | CAPpHfduH04sQ4yyyHpkXQAy2m8EZoOuRycSgw7+dCA92mP1Eog@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Sun, Apr 10, 2016 at 7:26 AM, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
wrote:
> On Sun, Apr 10, 2016 at 1:13 AM, Andres Freund <andres(at)anarazel(dot)de> wrote:
>
>> On 2016-04-09 22:38:31 +0300, Alexander Korotkov wrote:
>> > There are results with 5364b357 reverted.
>>
>>
> What exactly is this test?
> I think assuming it is a read-only -M prepared pgbench run where data fits
> in shared buffers. However if you can share exact details, then I can try
> the similar test.
>
Yes, the test is:
pgbench -s 1000 -c $clients -j 100 -M prepared -S -T 300
(shared_buffers=24GB)
>
>> Crazy that this has such a negative impact. Amit, can you reproduce
>> that?
>
>
> I will try it.
>
Good.
>
>
>> Alexander, I guess for r/w workload 5364b357 is a benefit on that
>> machine as well?
>>
>
> I also think so. Alexander, if try read-write workload with unlogged
> tables, then we should see an improvement.
>
I'll try read-write workload.
------
Alexander Korotkov
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company
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