Re: pg_upgrade: Pass -j down to vacuumdb

Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com> writes:
> On 2019-03-25 22:57, Tom Lane wrote:
>> + fprintf(script, "echo %sYou may wish to add --jobs=N for parallel analyzing.%s\n",
>> + ECHO_QUOTE, ECHO_QUOTE);

> But then you get that information after you have already started the script.

Yes, but that's already true of all the info that this script prints out.

> I don't find any information about this analyze business on the
> pg_upgrade reference page. Maybe a discussion there could explain the
> different paths better than making the output script extra complicated.

> Essentially: If you want a slow and gentle analyze, use the supplied
> script. If you want a fast analyze, use vacuumdb, perhaps with an
> appropriate --jobs option. Note that pg_upgrade --jobs and vacuumdb
> --jobs are resource-bound in different ways, so the same value might not
> be appropriate for both.

I have no objection to handling it that way (i.e., just as a doc fix).
Or we could do both.

regards, tom lane