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It may reduce the memory access of the profiler, but memory analysis was not performed to confirm it.
Hierarchical cache architectures designed to avoid this problem conflict with the rather irregular memory access of modern adaptive multilevel algorithms which cause frequent cache misses.
Indeed, in addition to the memory access of butterflies' inputs and outputs over several stages (log2(N) stages for a radix-2 FFT, shown in Fig. 2), conventional algorithms excessively and redundantly load twiddle factors (W N k ).
The heavy memory access of motion estimation (ME) execution consumes significant power and could limit ME execution when the available memory bandwidth (BW) is reduced because of access congestion or changes in the dynamics of the power environment of modern mobile devices.
The memory access of the SRP should be aligned by 128-bit words; therefore, if the data size is not a 128-bit word, the data should have an additional buffering stage to ensure an alignment with the 128-bit words.
This fact can be partially explained by the very efficient secondary memory access of GraphChi, but above all by the characteristics of the main-memory implementation of the RW algorithm.
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The additional levels also increase the latency of the memory access on a cache miss.
BitCuts achieves only 42%59%% the memory accesses of HyperSplit, HyperCuts and EffiCuts, the typical decision-tree algorithms.
Another disadvantage is that memory accesses of nodes on a slice are incoherent, which impedes the performance of GPU implementations [29].
The global memory accesses of the GPU for both reading and writing are done so that in one clock cycle all the threads of a warp (L) access to 4·L bytes of RAM, where L is equal to 32 in CUDA Compute Capability 1.2 GPUs.
Another associated problem with BFS is the randomness of memory accesses of graph data, in contrast to traditional numerical computing using CSR such as the Conjugate Gradient method, where the access to the row elements of a matrix can become contiguous.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com