On 27.12.2012 22:46, Alvaro Herrera wrote:
Heikki Linnakangas wrote:

Might be cleaner to directly assign the correct value to MaxBackends
above, ie. "MaxBackends =  MaxConnections + newval + 1 +
GetNumShmemAttachedBgworkers()". With a comment to remind that it
needs to be kept in sync with the other places where that
calculation is done, in guc.c. Or put that calculation in a new
function and call it above and in guc.c.

Thinking about this some more, it might be cleaner to move the
responsibility of setting MaxBackends out of guc.c, into
postmaster.c. The guc machinery would set max_connections and
autovacuum_max_workers as usual, but not try to set MaxBackends.
After reading the config file in postmaster.c, calculate

Here's a small patch that applies on top of yours.  Do you intend to
commit this?  If not, let me know and I'll do it.

Wasn't planning to, feel free to commit.

- Heikki

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