Retry in pgbench

Currently standard pgbench scenario produces transaction serialize
errors "could not serialize access due to concurrent update" if
PostgreSQL runs in REPEATABLE READ or SERIALIZABLE level, and the
session aborts. In order to achieve meaningful results even in these
transaction isolation levels, I would like to propose an automatic
retry feature if "could not serialize access due to concurrent update"
error occurs.

Probably just adding a switch to retry is not enough, maybe retry
method (random interval etc.) and max retry number are needed to be
added.

I would like to hear your thoughts,

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp