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Remove postmaster.c's check that NBuffers is at least twice MaxBackends.

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With the addition of multiple autovacuum workers, our choices were to delete
the check, document the interaction with autovacuum_max_workers, or complicate
the check to try to hide that interaction.  Since this restriction has never
been adequate to ensure backends can't run out of pinnable buffers, it doesn't
really have enough excuse to live to justify the second or third choices.
Per discussion of a complaint from Andreas Kling (see also bug #3888).

This commit also removes several documentation references to this restriction,
but I'm not sure I got them all.
This commit is contained in:
Tom Lane
2008-03-09 04:56:28 +00:00
parent f4230d2937
commit d9384a4b73
4 changed files with 9 additions and 27 deletions
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5
src/backend/utils/misc/postgresql.conf.sample
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@ -60,8 +60,7 @@
#port = 5432 # (change requires restart)
#max_connections = 100 # (change requires restart)
# Note: Increasing max_connections costs ~400 bytes of shared memory per
# connection slot, plus lock space (see max_locks_per_transaction). You might
# also need to raise shared_buffers to support more connections.
# connection slot, plus lock space (see max_locks_per_transaction).
#superuser_reserved_connections = 3 # (change requires restart)
#unix_socket_directory = '' # (change requires restart)
#unix_socket_group = '' # (change requires restart)
@ -104,7 +103,7 @@
# - Memory -
#shared_buffers = 32MB # min 128kB or max_connections*16kB
#shared_buffers = 32MB # min 128kB
# (change requires restart)
#temp_buffers = 8MB # min 800kB
#max_prepared_transactions = 5 # can be 0 or more