| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
| Cc: | Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru>, 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: | 2016-04-14 02:35:42 |
| Message-ID: | 20160414023542.7if7rsmynx6jndia@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
On 2016-04-14 07:59:07 +0530, Amit Kapila wrote:
> What you want to see by prewarming?
Prewarming appears to greatly reduce the per-run variance on that
machine, making it a lot easier to get meaningful results. Thus it'd
make it easier to compare pre/post padding numbers.
> Will it have safe effect, if the tests are run for 10 or 15 mins
> rather than 5 mins?
s/safe/same/? If so, no, I doesn't look that way. The order of buffers
appears to play a large role; and it won't change in a memory resident
workload over one run.
Greetings,
Andres Freund
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