Hi,
On 2016-05-24 06:03:07 +0000, Tsunakawa, Takayuki wrote:
> At that time, many backend processes (I forgot the number) were acquiring and releasing share mode lock on ProcArrayLock, most of which were from TransactionIsInProgress().
FWIW, I suspect that 9.6 might be a fair bit better here, due to
http://git.postgresql.org/gitweb/?p=postgresql.git;a=commit;h=8a7d0701814a4e293efad22091d6f6fb441bbe1c
Regards,
Andres