The Experts below are selected from a list of 43545 Experts worldwide ranked by ideXlab platform
Timothy Mark Pinkston - One of the best experts on this subject based on the ideXlab platform.
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Worm-Bubble Flow control
Proceedings - International Symposium on High-Performance Computer Architecture, 2013Co-Authors: Lizhong Chen, Timothy Mark PinkstonAbstract:Deadlock-free Flow control should be designed with minimal cost, particularly for on-chip designs where area and power resources are greatly constrained. While Bubble Flow Control, proposed a decade ago, can avoid deadlock in VCT-switched tori with only one virtual channel (VC), there has been no working solution for wormhole switching that achieves the similar objective. Wormhole switching allows the channel buffer size to be smaller than the packet size, thus is preferred by on-chip networks. However, wormhole packets can span multiple routers, thereby creating additional channel dependences and adding complexities in both deadlock and starvation avoidance. In this paper, we propose Worm-Bubble Flow Control (WBFC), a new Flow control scheme that can avoid deadlock in wormhole-switched tori using minimally 1-flit-sized buffers per VC and one VC in total. Moreover, any wormhole-switched topology with embedded rings can use WBFC to avoid deadlock within each ring. Simulation results from synthetic traffic and PARSEC benchmarks show that the proposed approach can achieve significant throughput improvement and also area and energy savings compared to an optimized Dateline routing approach.
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HPCA - Worm-Bubble Flow Control
2013 IEEE 19th International Symposium on High Performance Computer Architecture (HPCA), 2013Co-Authors: Lizhong Chen, Timothy Mark PinkstonAbstract:Deadlock-free Flow control should be designed with minimal cost, particularly for on-chip designs where area and power resources are greatly constrained. While Bubble Flow Control, proposed a decade ago, can avoid deadlock in VCT-switched tori with only one virtual channel (VC), there has been no working solution for wormhole switching that achieves the similar objective. Wormhole switching allows the channel buffer size to be smaller than the packet size, thus is preferred by on-chip networks. However, wormhole packets can span multiple routers, thereby creating additional channel dependences and adding complexities in both deadlock and starvation avoidance. In this paper, we propose Worm-Bubble Flow Control (WBFC), a new Flow control scheme that can avoid deadlock in wormhole-switched tori using minimally 1-flit-sized buffers per VC and one VC in total. Moreover, any wormhole-switched topology with embedded rings can use WBFC to avoid deadlock within each ring. Simulation results from synthetic traffic and PARSEC benchmarks show that the proposed approach can achieve significant throughput improvement and also area and energy savings compared to an optimized Dateline routing approach.
Lizhong Chen - One of the best experts on this subject based on the ideXlab platform.
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Worm-Bubble Flow control
Proceedings - International Symposium on High-Performance Computer Architecture, 2013Co-Authors: Lizhong Chen, Timothy Mark PinkstonAbstract:Deadlock-free Flow control should be designed with minimal cost, particularly for on-chip designs where area and power resources are greatly constrained. While Bubble Flow Control, proposed a decade ago, can avoid deadlock in VCT-switched tori with only one virtual channel (VC), there has been no working solution for wormhole switching that achieves the similar objective. Wormhole switching allows the channel buffer size to be smaller than the packet size, thus is preferred by on-chip networks. However, wormhole packets can span multiple routers, thereby creating additional channel dependences and adding complexities in both deadlock and starvation avoidance. In this paper, we propose Worm-Bubble Flow Control (WBFC), a new Flow control scheme that can avoid deadlock in wormhole-switched tori using minimally 1-flit-sized buffers per VC and one VC in total. Moreover, any wormhole-switched topology with embedded rings can use WBFC to avoid deadlock within each ring. Simulation results from synthetic traffic and PARSEC benchmarks show that the proposed approach can achieve significant throughput improvement and also area and energy savings compared to an optimized Dateline routing approach.
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HPCA - Worm-Bubble Flow Control
2013 IEEE 19th International Symposium on High Performance Computer Architecture (HPCA), 2013Co-Authors: Lizhong Chen, Timothy Mark PinkstonAbstract:Deadlock-free Flow control should be designed with minimal cost, particularly for on-chip designs where area and power resources are greatly constrained. While Bubble Flow Control, proposed a decade ago, can avoid deadlock in VCT-switched tori with only one virtual channel (VC), there has been no working solution for wormhole switching that achieves the similar objective. Wormhole switching allows the channel buffer size to be smaller than the packet size, thus is preferred by on-chip networks. However, wormhole packets can span multiple routers, thereby creating additional channel dependences and adding complexities in both deadlock and starvation avoidance. In this paper, we propose Worm-Bubble Flow Control (WBFC), a new Flow control scheme that can avoid deadlock in wormhole-switched tori using minimally 1-flit-sized buffers per VC and one VC in total. Moreover, any wormhole-switched topology with embedded rings can use WBFC to avoid deadlock within each ring. Simulation results from synthetic traffic and PARSEC benchmarks show that the proposed approach can achieve significant throughput improvement and also area and energy savings compared to an optimized Dateline routing approach.
Noël Midoux - One of the best experts on this subject based on the ideXlab platform.
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Bubble Flow in trickle beds: investigations using resistive sensors
Chemical Engineering Science, 2003Co-Authors: S. Rode, K Benkrid, T Gillier, Noël MidouxAbstract:Abstract The local hydrodynamics of co-current gas–liquid down-Flow through porous media are investigated in a quasi two-dimensional regular arrangement by means of a network of resistive sensors. The investigations are focused on a liquid continuous Flow regime, the dispersed Bubble Flow, where the gas is divided into elongated Bubbles. Due to the variation of the local Flow channel orientation and the local void fraction, the average Bubble velocity strongly depends on the local geometry. The Flow is more coherent in vertical constrictions, compared to all other types of sites, this is probably due to Bubble stagnation in the Flow channel enlargements. At a given liquid superficial velocities and for sufficiently high superficial gas velocities, the average Bubble size is independent of the gas Flow rate; it is of the order of magnitude of the volume of the enlargements of the porous medium. The maximum Bubble size is about three times its average size, corresponding thus to the coalescence of three average sized Bubbles.
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Bubble Flow mechanisms in trickle beds—an experimental study using image processing
Chemical Engineering Science, 2002Co-Authors: K Benkrid, S. Rode, Michel Pons, P Pitiot, Noël MidouxAbstract:Abstract The mechanisms of Bubble motion in concurrent gas–liquid down Flow through trickle beds are investigated. The laboratory reactor is a structured quasi-two-dimensional porous medium with an average pore diameter close to the values encountered in trickle beds. The accuracy of the reactor design is demonstrated by hydrodynamic investigations on the reactor scale where it is shown that the Flow regimes encountered and the experimental pressure drop are comparable to those observed in trickle beds. The investigations on the pore scale are focused on the dispersed Bubble Flow regime where the liquid Flow is continuous and the gas is divided into elongated Bubbles. The Bubble motion is recorded with the aid of a high-speed video camera and the images are processed and analysed in a quantitative manner. The investigations clearly show that in dispersed Bubble Flow, the Bubbles are frequently pulsing on the pore scale. The mechanism of this Flow pattern is discussed.
K Benkrid - One of the best experts on this subject based on the ideXlab platform.
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Bubble Flow in trickle beds: investigations using resistive sensors
Chemical Engineering Science, 2003Co-Authors: S. Rode, K Benkrid, T Gillier, Noël MidouxAbstract:Abstract The local hydrodynamics of co-current gas–liquid down-Flow through porous media are investigated in a quasi two-dimensional regular arrangement by means of a network of resistive sensors. The investigations are focused on a liquid continuous Flow regime, the dispersed Bubble Flow, where the gas is divided into elongated Bubbles. Due to the variation of the local Flow channel orientation and the local void fraction, the average Bubble velocity strongly depends on the local geometry. The Flow is more coherent in vertical constrictions, compared to all other types of sites, this is probably due to Bubble stagnation in the Flow channel enlargements. At a given liquid superficial velocities and for sufficiently high superficial gas velocities, the average Bubble size is independent of the gas Flow rate; it is of the order of magnitude of the volume of the enlargements of the porous medium. The maximum Bubble size is about three times its average size, corresponding thus to the coalescence of three average sized Bubbles.
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Bubble Flow mechanisms in trickle beds—an experimental study using image processing
Chemical Engineering Science, 2002Co-Authors: K Benkrid, S. Rode, Michel Pons, P Pitiot, Noël MidouxAbstract:Abstract The mechanisms of Bubble motion in concurrent gas–liquid down Flow through trickle beds are investigated. The laboratory reactor is a structured quasi-two-dimensional porous medium with an average pore diameter close to the values encountered in trickle beds. The accuracy of the reactor design is demonstrated by hydrodynamic investigations on the reactor scale where it is shown that the Flow regimes encountered and the experimental pressure drop are comparable to those observed in trickle beds. The investigations on the pore scale are focused on the dispersed Bubble Flow regime where the liquid Flow is continuous and the gas is divided into elongated Bubbles. The Bubble motion is recorded with the aid of a high-speed video camera and the images are processed and analysed in a quantitative manner. The investigations clearly show that in dispersed Bubble Flow, the Bubbles are frequently pulsing on the pore scale. The mechanism of this Flow pattern is discussed.
S. Rode - One of the best experts on this subject based on the ideXlab platform.
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Bubble Flow in trickle beds: investigations using resistive sensors
Chemical Engineering Science, 2003Co-Authors: S. Rode, K Benkrid, T Gillier, Noël MidouxAbstract:Abstract The local hydrodynamics of co-current gas–liquid down-Flow through porous media are investigated in a quasi two-dimensional regular arrangement by means of a network of resistive sensors. The investigations are focused on a liquid continuous Flow regime, the dispersed Bubble Flow, where the gas is divided into elongated Bubbles. Due to the variation of the local Flow channel orientation and the local void fraction, the average Bubble velocity strongly depends on the local geometry. The Flow is more coherent in vertical constrictions, compared to all other types of sites, this is probably due to Bubble stagnation in the Flow channel enlargements. At a given liquid superficial velocities and for sufficiently high superficial gas velocities, the average Bubble size is independent of the gas Flow rate; it is of the order of magnitude of the volume of the enlargements of the porous medium. The maximum Bubble size is about three times its average size, corresponding thus to the coalescence of three average sized Bubbles.
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Bubble Flow mechanisms in trickle beds—an experimental study using image processing
Chemical Engineering Science, 2002Co-Authors: K Benkrid, S. Rode, Michel Pons, P Pitiot, Noël MidouxAbstract:Abstract The mechanisms of Bubble motion in concurrent gas–liquid down Flow through trickle beds are investigated. The laboratory reactor is a structured quasi-two-dimensional porous medium with an average pore diameter close to the values encountered in trickle beds. The accuracy of the reactor design is demonstrated by hydrodynamic investigations on the reactor scale where it is shown that the Flow regimes encountered and the experimental pressure drop are comparable to those observed in trickle beds. The investigations on the pore scale are focused on the dispersed Bubble Flow regime where the liquid Flow is continuous and the gas is divided into elongated Bubbles. The Bubble motion is recorded with the aid of a high-speed video camera and the images are processed and analysed in a quantitative manner. The investigations clearly show that in dispersed Bubble Flow, the Bubbles are frequently pulsing on the pore scale. The mechanism of this Flow pattern is discussed.
