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New infrastructure is added which creates a set number of workers (threads on Windows, forked processes on Unix). Jobs are then handed out to these workers by the master process as needed. pg_restore is adjusted to use this new infrastructure in place of the old setup which created a new worker for each step on the fly. Parallel dumps acquire a snapshot clone in order to stay consistent, if available. The parallel option is selected by the -j / --jobs command line parameter of pg_dump. Joachim Wieland, lightly editorialized by Andrew Dunstan.