max_*, shared_buffers, and shared memory

Hey, everyone, a quick shared memory. So,

max_connections are ~400b per connection
max_prepared_transactions are ~600b per prepared transaction
for lock management the cost is in table slots in units of ~220b per
table slot with total table slots = (max_locks_per_transaction +
(max_connections + max_prepared_transactions))

So, of these settings, which are accounted for as part of
shared_buffers and which result in a system shared memory request on
top of the shared_buffers setting at server start? I ask because I
thought that they were all "on top of" shared_buffers" but the
comment in the config for max_connections mentions raising
shared_buffers to accommodate more.

Erik Jones

Software Developer | Emma®
erik(at)myemma(dot)com
800.595.4401 or 615.292.5888
615.292.0777 (fax)

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