| From: | "Tsunakawa, Takayuki" <tsunakawa(dot)takay(at)jp(dot)fujitsu(dot)com> |
|---|---|
| To: | 'Kyotaro HORIGUCHI' <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp> |
| Cc: | "Jamison, Kirk" <k(dot)jamison(at)jp(dot)fujitsu(dot)com>, "thomas(dot)munro(at)enterprisedb(dot)com" <thomas(dot)munro(at)enterprisedb(dot)com>, "david(dot)rowley(at)2ndquadrant(dot)com" <david(dot)rowley(at)2ndquadrant(dot)com>, "andres(at)anarazel(dot)de" <andres(at)anarazel(dot)de>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | RE: Cache relation sizes? |
| Date: | 2019-02-06 08:29:54 |
| Message-ID: | 0A3221C70F24FB45833433255569204D1FB956CF@G01JPEXMBYT05 |
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| Lists: | pgsql-hackers |
From: Kyotaro HORIGUCHI [mailto:horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp]
> Just one counter in the patch *seems* to give significant gain
> comparing to the complexity, given that lseek is so complex or it
> brings latency, especially on workloads where file is scarcely
> changed. Though I didn't run it on a test bench.
I expect so, too.
> I'm not sure the duration of the 'permanent' there, but it
> disappears when server stops. Anyway it doesn't need to be
> permanent beyond a server restart.
Right, it exists while the server is running.
Regards
Takayuki Tsunakawa
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