Re: doc: expand note about pg_upgrade's --jobs option
От | Nathan Bossart |
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Тема | Re: doc: expand note about pg_upgrade's --jobs option |
Дата | |
Msg-id | Z8hvP82sKppwRmVu@nathan обсуждение исходный текст |
Ответ на | Re: doc: expand note about pg_upgrade's --jobs option (Magnus Hagander <magnus@hagander.net>) |
Ответы |
Re: doc: expand note about pg_upgrade's --jobs option
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Список | pgsql-hackers |
On Wed, Mar 05, 2025 at 01:52:40PM +0100, Magnus Hagander wrote: > Another option that I think would also work is to just cut down the details > to just "The <option>--jobs</option> option allows multiple CPU cores to be > used". That's fine with me. It's probably not particularly actionable information, anyway. If anything, IMHO we should make it clear to users that the parallelization is per-database (except for file transfer, which is per-tablespace). If you've just got one big database in the default tablespace, --jobs won't help. > I think this is also slightly confusing, but maybe that's a > non-native-english thing: "a good place to start is the maximum of the > number of CPU cores and tablespaces.". Am I supposed to set it to > max(cpucores, ntablespaces) or to max(cpucores+ntablespaces)? I've always read it to mean the former. But I'm not sure that's great advice. If you have 8 cores and 100 tablespaces, does it make sense to use --jobs=100? Ordinarily, I'd suggest the number of cores as the starting point. -- nathan
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