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buzzword [2015/04/16 17:42]
kevincha
buzzword [2015/04/22 12:47]
rachata
Line 1281: Line 1281:
         * Has an exclusive state         * Has an exclusive state
  
-===== Lecture 29 (4/13 Fri.) =====+===== Lecture 29 (4/10 Fri.) =====
   * MSI coherent protocol   * MSI coherent protocol
     * The problem: unnecessary broadcasts of invalidations     * The problem: unnecessary broadcasts of invalidations
Line 1355: Line 1355:
     ​     ​
  
 +
 +===== Lecture 32 (4/20 Mon.) =====
 +
 +  * Heterogeneous systems
 +    * Asymmetric cores: different types of cores on the chip
 +      * Each of these cores are optimized for different workloads/​requirements/​goals
 +      * Multiple special purpose processors
 +      * Flexible and can adapt to workload behavior
 +      * Disadvantages:​ complex and high overhead
 +    * Examples: CPU-GPU systems, heterogeneity in execution models
 +    * Heterogeneous resources
 +      * Example: reliable and non-reliable DRAM in the same system
 +  * Key problems in modern systems
 +    * Memory system
 +    * Efficiency
 +    * Predictability
 +    * Assymmetric design can help solving these problems
 +  * Serialized code sections
 +    * Bottleneck in multicore execution
 +    * Parallelizable vs. serial portion
 +    * Accelerate critical section
 +    * Cache ping-ponging
 +      * Synchronization latency
 +    * Symmetric vs. assymmetric design
 +  * Large cores + small cores
 +    * Core assymmetry
 +  * Amdahl'​s law with heterogeneous cores
 +  * Parallel bottlenecks
 +    * Resource contention
 +      * Depends on what are running
 +  * Accelerated critical section
 +    * Ship critical sections to large cores
 +    * Small modifications and low overhead
 +    * False serialization might become the bottleneck
 +    * Can reduce parallel throughput
 +    * Effect on private cache misses and shared cache misses
 +    ​
 +  ​
 +
 +    ​
     ​     ​
buzzword.txt ยท Last modified: 2015/04/27 14:20 by rachata