| From: | Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com> |
|---|---|
| To: | andres(at)anarazel(dot)de |
| Cc: | robertmhaas(at)gmail(dot)com, hlinnaka(at)iki(dot)fi, ideriha(dot)takeshi(at)jp(dot)fujitsu(dot)com, tomas(dot)vondra(at)2ndquadrant(dot)com, tgl(at)sss(dot)pgh(dot)pa(dot)us, tsunakawa(dot)takay(at)jp(dot)fujitsu(dot)com, alvherre(at)2ndquadrant(dot)com, bruce(at)momjian(dot)us, pgsql-hackers(at)lists(dot)postgresql(dot)org, michael(dot)paquier(at)gmail(dot)com, david(at)pgmasters(dot)net, craig(at)2ndquadrant(dot)com |
| Subject: | Re: Protect syscache from bloating with negative cache entries |
| Date: | 2020-11-19 06:23:05 |
| Message-ID: | 20201119.152305.2028860426879229616.horikyota.ntt@gmail.com |
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| Lists: | pgsql-hackers |
At Wed, 18 Nov 2020 21:42:02 -0800, Andres Freund <andres(at)anarazel(dot)de> wrote in
> Hi,
>
> On 2020-11-19 14:25:36 +0900, Kyotaro Horiguchi wrote:
> > # Creation, searching and expiration
> > master : 6393.23 (100.0)
> > patched-off: 6527.94 (102.1)
> > patched-on : 15880.01 (248.4)
>
> What's the deal with this massive increase here?
CatCacheRemovedCTup(). If I replaced a call to the function in the
cleanup functoin with dlist_delete(), the result changes as:
master : 6372.04 (100.0) (2)
patched-off : 6464.97 (101.5) (2)
patched-on : 5354.42 ( 84.0) (2)
We could boost the expiration if we reuse the "deleted" entry at the
next entry creation.
regards.
--
Kyotaro Horiguchi
NTT Open Source Software Center
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