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Most computer architectures are moving to 64-bit virtual address spaces. We first discuss how this change impacts conventional linear, forwardmapped, and hashed page tables. We then introduce a new page table data structure-clustered page table-that can be viewed as a hashed page table augmented with subblocking. Specifically, it associates mapping information for several pages (e.g., sixteen) with a single virtual tag and next pointer. Simulation results with several workloads show thatdoi:10.1145/224057.224071 fatcat:kyt5rqsj2fhqbkbaxwbrdww5fi