any way to prevent SSAS memory from paging?

This morning msmdsrv.exe looked like the following in Task Manager:

Memory Usage: 600,000 K

VM Size: 2,500,000 K

If I understand correctly, that means that a good deal of SSAS memory has been swapped to disk by the OS. Is there any way to prevent this? (I have read about using the Lock Pages In Memory privilege at http://msdn2.microsoft.com/en-us/library/ms179301.aspx which lets SQL prevent the OS from paging sqlservr.exe memory. I don't suppose there's an equivalent SSAS setting.)

In particular, the symptom I'm seeing is that after we finish processing, all that paged memory has to be loaded back into memory before the transaction can be committed. Committing the transaction is usually very quick. But when most of the SSAS process memory is pages, it takes quite a while, during which I can see the Memory Usage number in Task Manager growing. (I don't think it's a blocked transaction commit.)

Looks like maybe there is a way to do this in SP2. Can anyone explain the PreAllocate setting further?

http://www.sdsqlug.org/presentations/November2006/November_2006_64-bit_SQL_Server.pdf (page 36)