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Lecture 19: Networks for Large Cache Design

Lecture 19: Networks for Large Cache Design. Papers: Interconnect Design Considerations for Large NUCA Caches, Muralimanohar and Balasubramonian, ISCA’07 Design and Management of 3D Chip Multiprocessors using Network-in-Memory, Li et al., ISCA’06

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Lecture 19: Networks for Large Cache Design

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  1. Lecture 19: Networks for Large Cache Design • Papers: • Interconnect Design Considerations for Large NUCA • Caches, Muralimanohar and Balasubramonian, ISCA’07 • Design and Management of 3D Chip Multiprocessors using • Network-in-Memory, Li et al., ISCA’06 • A Domain-Specific On-Chip Network Design for Large Scale • Cache Systems, Jin et al., HPCA’07 • Nahalal: Cache Organization for Chip Multiprocessors, • Guz et al., Comp. Arch. Letters, 2007

  2. Traditional Networks Example designs for contiguous L2 cache regions

  3. NUCA Delays Cache Controller R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R

  4. Explorations for Optimality

  5. Early and Aggressive Look-Up Cache Controller • Address packet can only contain • LSB and can use latency-optimized • wires (transmission lines / fat wires) • Data packet also contains tags and • can use regular wires • The on-chip network can now have • different types of links for address • and data MSB LSB R

  6. Hybrid Network Data Network Cache Controller R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R

  7. Hybrid Network Address Network Cache Controller R R R R

  8. Results

  9. 3D Designs, Li et al., ISCA’06 • D-NUCA: first search in cylinder, then multicast search everywhere • Data is migrated close to requester, but need not jump across layers

  10. Halo Network, Jin et al., HPCA’07 • D-NUCA: Sets are distributed across columns; • Ways are distributed across rows

  11. Halo Network

  12. Nahalal, Guz et al., CAL’07

  13. Nahalal • Block is initially placed in core’s private bank and then swapped into • the shared bank if frequently accessed by other cores • Parallel search across all banks

  14. Title • Bullet

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