On 05/31/2016 11:17 AM, Peter Eisentraut wrote: > On 5/31/16 2:02 PM, Josh berkus wrote: >> I get where you're coming from, but I think Haas's query plan output is >> going to show us the confusion we're going to get. So we need to either >> change the parameter, the explain output, or brace ourselves for endless >> repeated questions. > > Changing the explain output doesn't sound so bad to me. > > The users' problem is that the parameter setting ought to match the > EXPLAIN output. > > The developers' problem is that the EXPLAIN output actually corresponds > to leader + (N-1) workers internally. > > I think we can hope that developers are going to be less confused about > that than users.
Makes sense. One more consistency question: what's the effect of running out of max_parallel_workers? That is, say max_parallel_workers is set to 10, and 8 are already allocated. If I ask for max_parallel_X = 4, how many cores to I use? Presumably the leader isn't counted towards max_parallel_workers? -- -- Josh Berkus Red Hat OSAS (any opinions are my own) -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
