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In case you were saying Redshift is literally PostgreSQL, it appears it's actually ParAccel: http://www.informationweek.com/software/information-management/ama

• jmccarthy 14y ago
  ParAccel, Neteeza, Greenplum and Vertica all owe some measure of their roots to PostgreSQL (the GP binary is still called `postgres`). Development of parallel query execution in PostgreSQL proper has been stagnant for quite a while unfortunately: http://wiki.postgresql.org/wiki/Parallel_Query_Execution http://wiki.postgresql.org/wiki/Parallel_Query_Execution
  • jeffdavis 14y ago
    "Development of parallel query execution in PostgreSQL proper has been stagnant for quite a while unfortunately" To clarify, this is related to the parallel execution of a single query. PostgreSQL has been making huge improvements scaling to many cores when there are many concurrent queries. Even for single queries, postgres has been chipping away at the edges by moving more tasks to background processes.