Data cache prefetching in the L2 is at the forefront of pre-fetching research. In this paper we analyze the impact of virtual page boundaries on these prefetchers. Conservative measurements on real hardware show that ...
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ISBN:
(纸本)1595936831
Data cache prefetching in the L2 is at the forefront of pre-fetching research. In this paper we analyze the impact of virtual page boundaries on these prefetchers. Conservative measurements on real hardware show that 30-50% of consecutive virtual pages are mapped to pages which are not consecutive in physical memory. advanced hardware prefetching techniques that detect access patterns which span virtual page boundaries often end up prefetching data that is from the wrong physical page. Meanwhile, current simulation techniques for evaluating prefetching algorithms assume that all virtual pages are mapped consecutively. We show that not accounting for virtual page boundaries in simulation can lead to overestimates of as much as 29% (9% on average). We also show that a simple prefetch filter can improve performance up to 32% (7% on average) and recover the overestimated performance. This leads to the conclusion that although previous simulations may not have accounted for virtual page boundaries, the results they demonstrate are still attainable and that it is not necessary to simulate virtual page boundaries to get accurate results. However, actual hardware designers should take care to implement a simple filter or else their hardware may not show the same gains in performance as they did in simulation. Copyright 2007 ACM.
In this paper we propose a dialogue game for agents to deliberate over a proposed action. The agents' dialogue moves are defined by a structured set of argument schemes and critical questions (CQs). Thus, a dialog...
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ISBN:
(纸本)9783540752530
In this paper we propose a dialogue game for agents to deliberate over a proposed action. The agents' dialogue moves are defined by a structured set of argument schemes and critical questions (CQs). Thus, a dialogue move is an instantiated scheme (i.e. an argument) or a CQ (i.e. a challenge on the argument instantiated in the scheme). The proposed dialogue game formalises the protocol based exchange of arguments defined in the ProCLAIM model. This model provides a setting for agents to deliberate over whether, given the arguments for and against, a proposed action is justified or not.
The concept of the Sagnac effect in a slow-light medium and resonator structure with a high group dispersion is investigated. It is found that a slow-light medium can be utilized for relative motion sensing, and a slo...
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Since the current rate control schemes in H.264 do not present the capability of efficient GOP-level bit allocation, the video quality varies greatly for sequences with the scene change or the scene complexity varying...
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ISBN:
(纸本)9780863418365
Since the current rate control schemes in H.264 do not present the capability of efficient GOP-level bit allocation, the video quality varies greatly for sequences with the scene change or the scene complexity varying from one GOP to another. To overcome the limitation, we propose a novel rate control scheme based on incremental PID algorithm. The incremental PID algorithm is introduced to minimize video quality variations in GOP-level bit allocation. Extensive simulation results show that the proposed rate control scheme, without expensive computational complexity added, decreases the average video quality variations by 15.07%.
In this paper, a variant of the conventional multicasting called geocasting, or location-based multicasting, is presented. The proposed scheme combines any casting, restricted broadcasting, and heal broadcasting to de...
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Humans have two distinct features with compared to any other living being;unique physical nature and emotions / feelings. Anybody who studies on humans or trying to construct human like machines should consider these ...
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We demonstrate security-enhanced, multi-user SPECTS O-CDMA transmission across 150 km of field fiber. The testbed incorporates a fully integrated silica AWG spectral phase encoder/decoder and tunable dispersion slope ...
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In downlink multiuser systems, multiple-input multiple-output (MIMO) technology can be leveraged to increase capacity in fading channels. Knowledge of channel state information at the transmitter (CSIT) is important t...
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The PMSM is inherently electronically controlled and requires rotor position information for proper drives. However, the problems of the space, cost, and reliability of rotor position sensors have motivated research i...
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The term "color temperature" represents the color of light source or the white point of image displaying devices such as TV and PC monitor. In this paper, our goal is to find an appropriate method of convert...
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ISBN:
(纸本)9780769530383
The term "color temperature" represents the color of light source or the white point of image displaying devices such as TV and PC monitor. In this paper, our goal is to find an appropriate method of converting the color temperature in order to reproduce the user- preferred color temperature in video displaying devices. In order to achieve the goal, we experiment human's preference tendency towards the color temperature and then propose an adaptive color temperature conversion method reflecting estimated tendency.
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