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5 years ago

Niagara(T1)

Niagara(T1)

Thread Selection Policy

Thread Selection Policy ● CPU switches between available threads every cycle giving priority to least recently executed thread ● Threads become unavailable due to: – Long latency ops: loads, branch, mul, div – Pipeline stalls such as cache misses, traps, and resource conflicts ● Loads are speculated as cache hits, and the thread is switched in with lower priority. Sun Proprietary Information

Multithreaded Process on Niagara Pipe7 Pipe6 Pipe5 Pipe4 Pipe3 Pipe2 Pipe1 Pipe0 Thread 4 Thread 3 Thread 2 Thread 1 Thread 4 Thread 3 Thread 2 Thread 1 Thread 4 Thread 3 Thread 2 Thread 1 Thread 4 Thread 3 Thread 2 Thread 1 Thread 4 Thread 3 Thread 2 Thread 1 Thread 4 Thread 3 Thread 2 Thread 1 Thread 4 Thread 3 Thread 2 Thread 1 Thread 4 Thread 3 Thread 2 Thread 1 Memory Latency Compute Sun Proprietary Information Time Larger number of Memory References outstanding from overlapping h/w threads leads to higher throughput

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