buzzword
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buzzword [2014/03/26 18:17] rachata |
buzzword [2014/03/31 18:15] rachata |
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| + | ===== Lecture 23 (3/28 Fri.) ===== | ||
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| + | * DRAM design choices | ||
| + | * Cost/density/latency/BW/Yield | ||
| + | * Sense Amplifier | ||
| + | * How do they work | ||
| + | * Dual data rate | ||
| + | * Subarray | ||
| + | * Rowclone | ||
| + | * Moving bulk of data from one row to others | ||
| + | * Lower latency and BW when performing copies/zeroes out the data | ||
| + | * TL-DRAM | ||
| + | * Far segment | ||
| + | * Near segment | ||
| + | * What causes the long latency | ||
| + | * Benefit of TL-DRAM | ||
| + | * TL-DRAM vs. DRAM cache (adding a small cache in DRAM) | ||
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| + | ===== Lecture 24 (3/31 Mon.) ===== | ||
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| + | * Memory controller | ||
| + | * Different commands | ||
| + | * Memory scheduler | ||
| + | * Determine the order of requests to be issued to DRAM | ||
| + | * Age/hit-miss status/types(load/store/prefetch/from GPU/from CPU)/criticality | ||
| + | * Row buffer | ||
| + | * hit/conflict | ||
| + | * open/closed row | ||
| + | * Open row policy | ||
| + | * Closed row policy | ||
| + | * Tradeoffs between open and closed row policy | ||
| + | * What if the programs has high row buffer locality: open row might benefit more | ||
| + | * Closed row will service misses request faster | ||
| + | * Bank conflict | ||
| + | * Interference from different applications/threads | ||
| + | * Differnt programs/processes/threads interfere with each other | ||
| + | * introduce more row buffer/bank conflicts | ||
| + | * Memory schedule has to manage these interference | ||
| + | * Memory hog problems | ||
| + | * Interference in the data/command bus | ||
| + | * FR-FCFS | ||
| + | * Why does FR-FCFS make sense? | ||
| + | * Row buffer has lower lantecy | ||
| + | * Issues with FR-FCFS | ||
| + | * Unfairness | ||
| + | * STFM | ||
| + | * Fairness issue in memory scheduling | ||
| + | * How does STFM calculate the fairness and slowdown | ||
| + | * How to estimate slowdown time when it is runing alone | ||
| + | * Definition of fairness (based on STFM, different papers/areas define fairness differently) | ||
| + | * PAR-BS | ||
| + | * Parallelism in programs | ||
| + | * Intereference across banks | ||
| + | * How to form a batch | ||
| + | * How to determine ranking between batches/within a batch | ||
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buzzword.txt · Last modified: 2015/04/27 18:20 by rachata
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