The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Peter W Jones - One of the best experts on this subject based on the ideXlab platform.
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virulent and fungicide tolerant races of loose smut ustilago Nuda and u tritici in ireland
Plant Pathology, 1991Co-Authors: P Dhitaphichit, Peter W JonesAbstract:Following the severe outbreaks of loose smut in the early 1980s, a survey was carried out over the period l984-86of the Ustilago Nuda and U. tritici populations in the Republic of Ireland. U. tritici was very rare, only one infected wheat plant being reported in the 3 years of the survey. This fungus was represented by a virulent race distinct from those identified in Britain in the 1950s. U. Nuda was widespread, and two races were identified in 1984. A virulent race, capable of overcoming the recessive resistance gene present in differential variety Missouri Early Beardless, was isolated from a single crop grown from imported seed. Several crops grown from seed treated with Vitavax (active ingredient carboxin), which had been imported from France, contained a carboxin-tolerant race of U. Nuda. Subsequent surveys in 1985 and 1986 failed to recover these U. Nuda races. The role of imported infected seed in the introduction of new races of the loose smut fungi is discussed.
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Virulent and fungicide‐tolerant races of loose smut (Ustilago Nuda and U. tritici) in Ireland
Plant Pathology, 1991Co-Authors: P Dhitaphichit, Peter W JonesAbstract:Following the severe outbreaks of loose smut in the early 1980s, a survey was carried out over the period l984-86of the Ustilago Nuda and U. tritici populations in the Republic of Ireland. U. tritici was very rare, only one infected wheat plant being reported in the 3 years of the survey. This fungus was represented by a virulent race distinct from those identified in Britain in the 1950s. U. Nuda was widespread, and two races were identified in 1984. A virulent race, capable of overcoming the recessive resistance gene present in differential variety Missouri Early Beardless, was isolated from a single crop grown from imported seed. Several crops grown from seed treated with Vitavax (active ingredient carboxin), which had been imported from France, contained a carboxin-tolerant race of U. Nuda. Subsequent surveys in 1985 and 1986 failed to recover these U. Nuda races. The role of imported infected seed in the introduction of new races of the loose smut fungi is discussed.
Tien-fu Chen - One of the best experts on this subject based on the ideXlab platform.
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Nuda: A Non-Uniform Debugging Architecture and Nonintrusive Race Detection for Many-Core Systems
IEEE Transactions on Computers, 2012Co-Authors: Chi-neng Wen, Shu-hsuan Chou, Chien-chih Chen, Tien-fu ChenAbstract:Traditional debugging methodologies are limited in their ability to provide debugging support for many-core parallel programming. Synchronization problems or bugs due to race conditions are particularly difficult to detect with existing debugging tools. Most traditional debugging approaches rely on globally synchronized signals, but these pose their own problems in terms of scalability. The first contribution of this paper is to propose a novel non-uniform debugging architecture (Nuda) based on a ring interconnection schema. Our approach makes hardware-assisted debugging both feasible and scalable for many-core processing scenarios. The key idea is to distribute the debugging support structures across a set of hierarchical clusters while avoiding address overlap. The design strategy allows the address space to be monitored using non-uniform protocols. Our second contribution is to propose a nonintrusive approach to lockset-based race detection supported by the Nuda. A non-uniform page-based monitoring cache in each Nuda node is used to keep track of the access footprints. The union of all the caches can serve as a race detection probe without disturbing execution ordering. Using the proposed approach, we show that parallel race bugs can be precisely captured, and that most false-positive alerts can be efficiently eliminated at an average slowdown cost of only 1.4-3.6 percent. The net hardware cost is relatively low, so that the Nuda can easily be scaled to increasingly complex many-core systems.
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Nuda a non uniform debugging architecture and non intrusive race detection for many core
Design Automation Conference, 2009Co-Authors: Chi-neng Wen, Shu-hsuan Chou, Tien-fu ChenAbstract:Traditional debug methodologies are limited in their ability to provide debugging support for many-core parallel programming. Synchronization problems or bugs due to race conditions are particularly difficult to detect with software debugging tools. Most traditional debugging approaches rely on globally synchronized signals, but these pose problems in terms of scalability. The first contribution of this paper is to propose a novel nonuniform debug architecture (Nuda) based on a ring interconnection schema. Our approach makes debugging both feasible and scalable for many-core processing scenarios. The key idea is to distribute the debugging support structures across a set of hierarchical clusters while avoiding address overlap. This allows the address space to be monitored using non-uniform protocols. Our second contribution is a non-intrusive approach to race detection supported by the Nuda. A non-uniform page-based monitoring cache in each Nuda node is used to watch the access footprints. The union of all the caches can serve as a race detection probe. Using the proposed approach, we show that parallel race bugs can be precisely captured, and that most false-positive alerts can be efficiently eliminated at an average slow-down cost of only 1.4%~3.6%. The net hardware cost is relatively low, so that the Nuda can readily scale increasingly complex many-core systems.
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DAC - Nuda: a non-uniform debugging architecture and non-intrusive race detection for many-core
Proceedings of the 46th Annual Design Automation Conference on ZZZ - DAC '09, 2009Co-Authors: Chi-neng Wen, Shu-hsuan Chou, Tien-fu ChenAbstract:Traditional debug methodologies are limited in their ability to provide debugging support for many-core parallel programming. Synchronization problems or bugs due to race conditions are particularly difficult to detect with software debugging tools. Most traditional debugging approaches rely on globally synchronized signals, but these pose problems in terms of scalability. The first contribution of this paper is to propose a novel nonuniform debug architecture (Nuda) based on a ring interconnection schema. Our approach makes debugging both feasible and scalable for many-core processing scenarios. The key idea is to distribute the debugging support structures across a set of hierarchical clusters while avoiding address overlap. This allows the address space to be monitored using non-uniform protocols. Our second contribution is a non-intrusive approach to race detection supported by the Nuda. A non-uniform page-based monitoring cache in each Nuda node is used to watch the access footprints. The union of all the caches can serve as a race detection probe. Using the proposed approach, we show that parallel race bugs can be precisely captured, and that most false-positive alerts can be efficiently eliminated at an average slow-down cost of only 1.4%~3.6%. The net hardware cost is relatively low, so that the Nuda can readily scale increasingly complex many-core systems.
P Dhitaphichit - One of the best experts on this subject based on the ideXlab platform.
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virulent and fungicide tolerant races of loose smut ustilago Nuda and u tritici in ireland
Plant Pathology, 1991Co-Authors: P Dhitaphichit, Peter W JonesAbstract:Following the severe outbreaks of loose smut in the early 1980s, a survey was carried out over the period l984-86of the Ustilago Nuda and U. tritici populations in the Republic of Ireland. U. tritici was very rare, only one infected wheat plant being reported in the 3 years of the survey. This fungus was represented by a virulent race distinct from those identified in Britain in the 1950s. U. Nuda was widespread, and two races were identified in 1984. A virulent race, capable of overcoming the recessive resistance gene present in differential variety Missouri Early Beardless, was isolated from a single crop grown from imported seed. Several crops grown from seed treated with Vitavax (active ingredient carboxin), which had been imported from France, contained a carboxin-tolerant race of U. Nuda. Subsequent surveys in 1985 and 1986 failed to recover these U. Nuda races. The role of imported infected seed in the introduction of new races of the loose smut fungi is discussed.
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Virulent and fungicide‐tolerant races of loose smut (Ustilago Nuda and U. tritici) in Ireland
Plant Pathology, 1991Co-Authors: P Dhitaphichit, Peter W JonesAbstract:Following the severe outbreaks of loose smut in the early 1980s, a survey was carried out over the period l984-86of the Ustilago Nuda and U. tritici populations in the Republic of Ireland. U. tritici was very rare, only one infected wheat plant being reported in the 3 years of the survey. This fungus was represented by a virulent race distinct from those identified in Britain in the 1950s. U. Nuda was widespread, and two races were identified in 1984. A virulent race, capable of overcoming the recessive resistance gene present in differential variety Missouri Early Beardless, was isolated from a single crop grown from imported seed. Several crops grown from seed treated with Vitavax (active ingredient carboxin), which had been imported from France, contained a carboxin-tolerant race of U. Nuda. Subsequent surveys in 1985 and 1986 failed to recover these U. Nuda races. The role of imported infected seed in the introduction of new races of the loose smut fungi is discussed.
Chi-neng Wen - One of the best experts on this subject based on the ideXlab platform.
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Nuda: A Non-Uniform Debugging Architecture and Nonintrusive Race Detection for Many-Core Systems
IEEE Transactions on Computers, 2012Co-Authors: Chi-neng Wen, Shu-hsuan Chou, Chien-chih Chen, Tien-fu ChenAbstract:Traditional debugging methodologies are limited in their ability to provide debugging support for many-core parallel programming. Synchronization problems or bugs due to race conditions are particularly difficult to detect with existing debugging tools. Most traditional debugging approaches rely on globally synchronized signals, but these pose their own problems in terms of scalability. The first contribution of this paper is to propose a novel non-uniform debugging architecture (Nuda) based on a ring interconnection schema. Our approach makes hardware-assisted debugging both feasible and scalable for many-core processing scenarios. The key idea is to distribute the debugging support structures across a set of hierarchical clusters while avoiding address overlap. The design strategy allows the address space to be monitored using non-uniform protocols. Our second contribution is to propose a nonintrusive approach to lockset-based race detection supported by the Nuda. A non-uniform page-based monitoring cache in each Nuda node is used to keep track of the access footprints. The union of all the caches can serve as a race detection probe without disturbing execution ordering. Using the proposed approach, we show that parallel race bugs can be precisely captured, and that most false-positive alerts can be efficiently eliminated at an average slowdown cost of only 1.4-3.6 percent. The net hardware cost is relatively low, so that the Nuda can easily be scaled to increasingly complex many-core systems.
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Nuda a non uniform debugging architecture and non intrusive race detection for many core
Design Automation Conference, 2009Co-Authors: Chi-neng Wen, Shu-hsuan Chou, Tien-fu ChenAbstract:Traditional debug methodologies are limited in their ability to provide debugging support for many-core parallel programming. Synchronization problems or bugs due to race conditions are particularly difficult to detect with software debugging tools. Most traditional debugging approaches rely on globally synchronized signals, but these pose problems in terms of scalability. The first contribution of this paper is to propose a novel nonuniform debug architecture (Nuda) based on a ring interconnection schema. Our approach makes debugging both feasible and scalable for many-core processing scenarios. The key idea is to distribute the debugging support structures across a set of hierarchical clusters while avoiding address overlap. This allows the address space to be monitored using non-uniform protocols. Our second contribution is a non-intrusive approach to race detection supported by the Nuda. A non-uniform page-based monitoring cache in each Nuda node is used to watch the access footprints. The union of all the caches can serve as a race detection probe. Using the proposed approach, we show that parallel race bugs can be precisely captured, and that most false-positive alerts can be efficiently eliminated at an average slow-down cost of only 1.4%~3.6%. The net hardware cost is relatively low, so that the Nuda can readily scale increasingly complex many-core systems.
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DAC - Nuda: a non-uniform debugging architecture and non-intrusive race detection for many-core
Proceedings of the 46th Annual Design Automation Conference on ZZZ - DAC '09, 2009Co-Authors: Chi-neng Wen, Shu-hsuan Chou, Tien-fu ChenAbstract:Traditional debug methodologies are limited in their ability to provide debugging support for many-core parallel programming. Synchronization problems or bugs due to race conditions are particularly difficult to detect with software debugging tools. Most traditional debugging approaches rely on globally synchronized signals, but these pose problems in terms of scalability. The first contribution of this paper is to propose a novel nonuniform debug architecture (Nuda) based on a ring interconnection schema. Our approach makes debugging both feasible and scalable for many-core processing scenarios. The key idea is to distribute the debugging support structures across a set of hierarchical clusters while avoiding address overlap. This allows the address space to be monitored using non-uniform protocols. Our second contribution is a non-intrusive approach to race detection supported by the Nuda. A non-uniform page-based monitoring cache in each Nuda node is used to watch the access footprints. The union of all the caches can serve as a race detection probe. Using the proposed approach, we show that parallel race bugs can be precisely captured, and that most false-positive alerts can be efficiently eliminated at an average slow-down cost of only 1.4%~3.6%. The net hardware cost is relatively low, so that the Nuda can readily scale increasingly complex many-core systems.
P.l. Thomas - One of the best experts on this subject based on the ideXlab platform.
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incidence and severity of loose smut and surface borne smuts of barley on the canadian prairies from 1972 to 2009
Canadian Journal of Plant Pathology-revue Canadienne De Phytopathologie, 2014Co-Authors: J G Menzies, P.l. Thomas, S WoodsAbstract:AbstractThe barley pathogens Ustilago Nuda, U. nigra and U. hordei are seed-borne fungi likely introduced to western Canada on host seed by early European settlers. They initially caused large losses in barley crops, but the development of effective control practices has lessened their impact in western Canada. Monitoring of the incidence and severity of these pathogens in Manitoba, Saskatchewan, and to a lesser extent, Alberta has occurred annually from 1972 to 2009. The mean annual percentage of fields with plants expressing loose smut [U. Nuda] was 47% and surface-borne smut [U. nigra and/or U. hordei] was 24%. The average percentage of fields in which plants infected with U. Nuda and U. nigra and/or U. hordei were found was 11%. There did not appear to be a relationship in incidence between loose smut-infected plants and surface-borne smut-infected plants. The mean annual percentage of plants per field infected with U. Nuda was 0.6%, and with U. nigra and/or U. hordei was 1%. In general, the incidence...
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Incidence of carboxin resistance in Ustilago Nuda
Phytopathology, 1991Co-Authors: George Newcombe, P.l. ThomasAbstract:In planta validation and an appropriate in vitro assay confirmed the existence of carboxin resistance within some European field isolates of Ustilago Nuda. Carboxin resistance was not found within the 1988-1989 Canadian population (260 field isolates tested) of U. Nuda, nor within a worldwide population collected before the use of carboxin (96 field isolates tested). Indirect in vitro evidence was obtained, which indicated that the in planta effects of seed treatment with carboxin were fungicidal rather than fungistatic (...)
