shared memory size during upgrade pgsql with partitions

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Hello,

Currently we're working on PSQL 11.5 and we're trying upgrade to 12.1.

During that we have a problem:

command: "/usr/pgsql-12/bin/pg_dump" --host /cluster/postgresql --port 50432
--username postgres --schema-only --quote-all-identifiers --binary-upgrade
--format=custom  --file="pg_upgrade_dump_281535902.custom" 'dbname=sprint'
>> "pg_upgrade_dump_281535902.log" 2>&1
pg_dump: error: query failed: ERROR:  out of shared memory
HINT:  You might need to increase max_locks_per_transaction.
pg_dump: error: query was: LOCK TABLE
"some_schemaa"."table_part_80000000_2018q3" IN ACCESS SHARE MODE

On current instance we have about one thousand of partitions, partitioned in
two levels: first by id_product, and second level by quarter of the year, as
you can see on above log.

How have we to calculate shared memory, and (eventually
max_locks_per_transaction) to be fit to the limits during upgrade? 

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