| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Kevin Grittner <kgrittn(at)gmail(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Kevin Grittner <kgrittn(at)postgresql(dot)org>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>, "pgsql-committers(at)postgresql(dot)org" <pgsql-committers(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] Re: pgsql: Avoid extra locks in GetSnapshotData if old_snapshot_threshold < |
| Date: | 2016-04-13 20:01:48 |
| Message-ID: | 20160413200148.bawmwjdmggbllhha@alap3.anarazel.de |
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| Lists: | pgsql-committers pgsql-hackers |
Hi Kevin,
On 2016-04-13 12:21:10 -0700, Andres Freund wrote:
> 0:
> progress: 100.0 s, 593351.0 tps, lat 0.215 ms stddev 0.118
> progress: 200.0 s, 594035.9 tps, lat 0.215 ms stddev 0.118
> progress: 300.0 s, 594013.3 tps, lat 0.215 ms stddev 0.117
>
> -1:
> progress: 100.0 s, 600835.3 tps, lat 0.212 ms stddev 0.049
> progress: 200.0 s, 601466.1 tps, lat 0.212 ms stddev 0.048
> progress: 300.0 s, 601529.5 tps, lat 0.212 ms stddev 0.047
>
> reverted:
> progress: 100.0 s, 612676.6 tps, lat 0.208 ms stddev 0.048
> progress: 200.0 s, 613214.3 tps, lat 0.208 ms stddev 0.047
> progress: 300.0 s, 613384.3 tps, lat 0.208 ms stddev 0.047
Setting it to 1 gives:
progress: 100.0 s, 115413.7 tps, lat 1.107 ms stddev 1.240
progress: 200.0 s, 114907.4 tps, lat 1.113 ms stddev 1.244
progress: 300.0 s, 115621.4 tps, lat 1.106 ms stddev 1.238
If you want me to rn some other tests I can, but ISTM we have the data
we need?
- Andres
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| Previous Message | Andres Freund | 2016-04-13 19:22:02 | Re: [HACKERS] Re: pgsql: Avoid extra locks in GetSnapshotData if old_snapshot_threshold < |
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