You don't. SQLDW is a hosted database, you have no control at all of anything outside of the database. The details of the server, server config, hardware is managed for you.
If you really want that level of control, use a VM
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability
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