On Tue, 16 Feb 2021 at 02:12, Fabio Pardi wrote:
>
> On 14/02/2021 22:16, Gavin Flower wrote:
> > While I agree it might be good to be able specify the number of workers,
> > sure it would be possible to derive a suitable default based on the number
> > of effective processors available?
>
> I
On Mon, 15 Feb 2021 at 10:16, Gavin Flower
wrote:
> Just wondering why there is a hard coded limit.
I don't see where the hardcoded limit is. The total number is limited
to max_parallel_workers_per_gather, but there's nothing hardcoded
about the value of that.
> While I agree it might be good
On 14/02/2021 22:16, Gavin Flower wrote:
> On 14/02/2021 22:47, David Rowley wrote:
>> On Sun, 14 Feb 2021 at 13:15, Seamus Abshere
>> wrote:
>>> The comment from Robert says: (src/backend/optimizer/path/allpaths.c)
>>>
>>> /*
>>> * If the use of parallel
On Sun, 2021-02-14 at 22:47 +1300, David Rowley wrote:
> On Sun, 14 Feb 2021 at 13:15, Seamus Abshere
>
> wrote:
>
> > The comment from Robert says: (src/backend/optimizer/path/allpaths.c)
> > /*
> > * If the use of parallel append is permitted, always
> >
On 14/02/2021 22:47, David Rowley wrote:
On Sun, 14 Feb 2021 at 13:15, Seamus Abshere
wrote:
The comment from Robert says: (src/backend/optimizer/path/allpaths.c)
/*
* If the use of parallel append is permitted, always request
at least
*
Hi David,
That is a great suggestion, except my partitions are foreign tables.
I wonder if I could figure out a single empty partition that’s just a normal
table... but I’m using hash partitioning, so I think I would lose a modulus.
Best,
Seamus
--
Seamus Abshere, SCEA
+1 (608) 772-0696
hi,
Apologies for the self-replying, but I made it 700% faster by compiling from
source and forcing the parallel_workers from 7 to 96.
If this weren't a partitioned table, I could just do `alter table
test_3pd_cstore_partitioned set (parallel_workers = 96)` - but that isn't
currently
On Sun, 14 Feb 2021 at 13:15, Seamus Abshere
wrote:
> The comment from Robert says: (src/backend/optimizer/path/allpaths.c)
>
> /*
> * If the use of parallel append is permitted, always request
> at least
> * log2(# of children) workers.
>
> In
hi,
I've traced this back to the formula for Parallel Append workers -
log2(partitions).
The comment from Robert says: (src/backend/optimizer/path/allpaths.c)
/*
* If the use of parallel append is permitted, always request
at least
* log2(# of
hi,
How can I convince Postgres to use more than 8 cores?
I've got an r6gd.16xlarge with 64 vCpus and 512gb RAM running Postgres 13.1 on
Ubuntu 20.04.
CREATE TABLE tbl (
[...]
) PARTITION BY HASH (address_key);
It has 64 partitions - e.g. FOR VALUES WITH (modulus 64, remainder 0) etc.
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