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On many platforms the OS will round the sleep time to millisecond resolution, but there is no reason for us to pre-emptively round the argument to pg_usleep. When the delay was measured in milliseconds and started from 1 ms, it sometimes took many attempts until the logic that increases the delay by multiplying with a random value between 1 and 2 actually managed to bump it from 1 ms to 2 ms. That lead to a sequence of 1 ms waits until the delay started to increase. This wasn't really a problem but it looked odd if you observed the waits. There is no measurable difference in performance, but it's more readable this way. Jeff Janes
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Changes between all PostgreSQL releases are recorded in the file HISTORY. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.