-W Use more CPU-stressful memory copy

The "-W" option is not a valid option on its own and it needs to be used with a specific command or program. However, in general, the "-W" option may refer to different functionality depending on the context.

In the context of memory copy, the "-W" option may refer to the "write-combining" feature, which is a hardware feature that allows for more efficient memory writes by combining multiple smaller writes into a larger write. This can improve performance but may also increase CPU usage and memory consumption.

Therefore, the "-W" option may be used to enable or disable this feature, depending on the specific program or command being used. However, without more context, I cannot provide a more specific answer.