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The test module includes helper functions to quickly burn through lots of XIDs. They are used in the tests, and are also handy for manually testing XID wraparound. Since these tests are very expensive the entire suite is disabled by default. It requires to set PG_TEST_EXTRA to run it. Reviewed-by: Daniel Gustafsson, John Naylor, Michael Paquier Reviewed-by: vignesh C Author: Heikki Linnakangas, Masahiko Sawada, Andres Freund Discussion: https://www.postgresql.org/message-id/CAD21AoDVhkXp8HjpFO-gp3TgL6tCKcZQNxn04m01VAtcSi-5sA%40mail.gmail.com