Advanced Memory Optimization Techniques for Low-Power by Manish Verma, Peter Marwedel

By Manish Verma, Peter Marwedel

The layout of embedded structures warrants a brand new viewpoint a result of following purposes: first of all, gradual and effort inefficient reminiscence hierarchies have already develop into the bottleneck of the embedded platforms. it truly is documented within the literature because the reminiscence wall challenge. Secondly, the software program working at the modern embedded units is changing into more and more advanced. it's also good understood that no silver bullet exists to unravel the reminiscence wall challenge. for this reason, this e-book explores a collaborative process by way of featuring novel reminiscence hierarchies and software program optimization suggestions for the optimum usage of those reminiscence hierarchies. Linking reminiscence structure layout with memory-architecture acutely aware compilation leads to quick, energy-efficient and timing predictable reminiscence accesses. The review of the optimization strategies utilizing real-life benchmarks for a unmarried processor process, a multiprocessor system-on-chip (SoC) and for a electronic sign processor method, experiences major rate reductions within the power intake and function development of those platforms. The booklet provides a variety of optimizations, gradually expanding within the complexity of study and of reminiscence hierarchies. the ultimate bankruptcy covers optimization thoughts for purposes which include a number of tactics present in most recent embedded units. complex reminiscence Optimization strategies for Low energy Embedded Processors is designed for researchers, complier writers and embedded procedure designers / architects who desire to optimize the strength and function features of the reminiscence subsystem.

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The optimal non-overlayed scratchpad allocation (SA) approach is used to allocate memory objects onto the scratchpad memories. The energy and execution time values are normalized against the corresponding values for a system without a scratchpad memory. A few important observations can be made from the figure. First, the energy consumption as well the execution time values monotonically decrease with the increase in the size of the scratchpad memory. This is because the larger the scratchpad, the more memory objects are allocated and the less are the accesses to the slow and energy inefficient main memory.

The maximization of the total energy profit EP rof it is to be performed under the following constraints: (a) The aggregate space occupied by the memory objects on the scratchpad memory should be less than the size of the memory. 16) moi ∈M OSP M (b) A maximum of one memory object should be partially allocated on the scratchpad. In the following section, we present the ILP based SA approach and the greedy algorithm based Frac. SA approach. 5 Non-Overlayed Scratchpad Allocation The current section presents an integer linear programming (ILP) based optimal approach to solve the SA problem and a greedy algorithm based fractional scratchpad allocation approach.

SA problem achieves better solutions than the SA problem if the fractionally allocated memory object has uniform valence for each of its elements or is biased towards the scratchpad allocated portion. The computation of a fine grained valence for each memory object was not considered as it is not trivial and requires a significant computation overhead for profiling. Nevertheless, we will demonstrate that the greedy approach for the Frac. SA problem computes solutions which are very close to optimal solutions for the SA problem.

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