Interprocessor Communication : Towards Cache Integrated Network ...
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Interprocessor Communication : Towards Cache Integrated Network ...
Institute of Computer Science (ICS) â member of HiPEAC. Foundation for Research ... Configure the degree of cache asso
Interprocessor Communication : Towards Cache Integrated Network Interfaces Vassilis Papaefstathiou and Michael Papamichael Foundation for Research and Technology-Hellas (FORTH) Institute of Computer Science (ICS) – member of HiPEAC Computer Architecture and VLSI Systems Laboratory (CARV) Work funded by SARC
Motivation and Context ♦ Many on-chip cores available today (CMPs) – – – –
P
P
P
L2
L2
L1
Key scalability issue : efficient interprocessor communication Network-on-Chip (NoC) for the interconnection Memory resources in every tile used as L1 or L2 cache NoC interface in every tile Æ low cost to afford
– Processor and NI share local memory Æ lightweight NI – Allocation of memory blocks for NI use coarse or fine-grain block allocation (cache-line) – Fast and low latency mechanism for explicit messaging stores (send) and loads (receive) – Integrate NI mechanisms into the cache controller transmission similar to cache write-back reception similar to cache miss
Local Memory & Cache Controller
NI
NÆ1
Network-on-Chip
♦ Desired communication primitives
NI
– RDMA for bulk transfers post descriptors in cache-lines – Queues for small explicit transfers specify destination, size and payload send queues ( one-to-many ) receive queues ( many-to-one )
P2
NI
Local Memory & Cache Controller
1ÆN Local Memory & Cache Controller
Cache Line
P3
NI Queue
Runtime Configurable Memory Resources NI
♦ Applications configure the memory type ♦ Computation intensive applications
– Configure the degree of cache associativity
P
♦ Communication intensive applications – Fine grain allocation of blocks for NI
Configurable HW
– Diverse applications Æ different memory requirements
♦ Real-time embedded applications – Configure as addressable local store - scratchpad predictable performance
