"Sergey E. Koposov" <math@sai.msu.ru> writes:
> So, are the shared memory requirements increased for 8.1 ?
Yes; mostly from 2PC support I think. Try reducing
max_prepared_transactions. (We might want to debate whether the default
setting should be smaller than 50 --- it looks to me like that's adding
over 700K to the default shared memory block size.)
regards, tom lane