| From: | "tsunakawa(dot)takay(at)fujitsu(dot)com" <tsunakawa(dot)takay(at)fujitsu(dot)com> |
|---|---|
| To: | "k(dot)jamison(at)fujitsu(dot)com" <k(dot)jamison(at)fujitsu(dot)com> |
| Cc: | 'Kyotaro Horiguchi' <horikyota(dot)ntt(at)gmail(dot)com>, "amit(dot)kapila16(at)gmail(dot)com" <amit(dot)kapila16(at)gmail(dot)com>, "tgl(at)sss(dot)pgh(dot)pa(dot)us" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "andres(at)anarazel(dot)de" <andres(at)anarazel(dot)de>, "robertmhaas(at)gmail(dot)com" <robertmhaas(at)gmail(dot)com>, "tomas(dot)vondra(at)2ndquadrant(dot)com" <tomas(dot)vondra(at)2ndquadrant(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | RE: [Patch] Optimize dropping of relation buffers using dlist |
| Date: | 2020-09-25 09:01:38 |
| Message-ID: | TYAPR01MB2990FF07F510D65DC1B6570BFE360@TYAPR01MB2990.jpnprd01.prod.outlook.com |
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| Lists: | pgsql-hackers |
From: Jamison, Kirk/ジャミソン カーク <k(dot)jamison(at)fujitsu(dot)com>
> [Results]
> Recovery/Failover performance (in seconds). 3 trial runs.
>
> | shared_buffers | master | patch | %reg |
> |----------------|--------|--------|---------|
> | 128MB | 32.406 | 33.785 | 4.08% |
> | 1GB | 36.188 | 32.747 | -10.51% |
> | 2GB | 41.996 | 32.88 | -27.73% |
Thanks for sharing good results. We want to know if we can get as significant results as you gained before with hundreds of GBs of shared buffers, don't we?
> I also did similar benchmark performance as what Tomas did [1], simple
> "pgbench -S" tests (warmup and then 15 x 1-minute runs with 1, 8 and 16
> clients, but I'm not sure if my machine is reliable enough to produce reliable
> results for 8 clients and more.
Let me confirm just in case. Your patch should not affect pgbench performance, but you measured it. Is there anything you're concerned about?
Regards
Takayuki Tsunakawa
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