Process Limits for Large Scale DSO on Windows

Windows has a default limit on the resource usage for non-interactive sessions, which limits the number of processes that can be started in parallel. This puts a limit on the number of Large Scale DSO tasks (Design Points) that can be started on a given Windows machine. The limit is defined by the third parameter of the SharedSection segment of Windows registry HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\SubSystems\Windows.

SharedSection=1024,20480,768 (In this example, the limit is set to 768)

To increase the number of tasks that can be run on a single machine, increase this limit gradually, as needed, in multiples of 1024 (but not exceeding 8192). Ansys in-house testing has shown success in running up to 64 tasks on a machine with the value of 4096.

For more information, refer to Microsoft documentation.