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Privet2007 писал(а):Граждане, объясните, пожалуйста, как сравнить процессоры single core versus double core. Если есть single core процессор Интел 3.0 ghz, это тоже самое по скорости, что Интел 1.5 ghz dual core? Или там другая математика?

И ещё, насколько processor cache увеличивает скорость? Если сравнить 3M L2 Cache и 6M L2 Cache, то насколько существенна разница?

Заранее спасибо!

By 2015, the strategy of running chips at increasingly higher frequencies could create products that generate as much heat as a nuclear reactor, according to engineers, so multi-core processing is largely considered the future of computing. "There is a fundamental physics issue we can no longer get around," says Intel's Anwar Ghuloum. "If we kept going as we had been, the heat density on a chip would have equaled the surface of the sun." The first products based on the Larrabee chip are expected to be released in 2009 or 2010. The problem with the multi-core approach is that it will require an equally dramatic shift in software. To utilize the processing power contained in a multi-core chip, software will need to be divided into chucks of instructions that can run in parallel on multiple processors. Once chips with 10 cores are available in consumer products, much of today's existing software may have to be rewritten to take advantage of the extra processing capabilities. New programming languages are being developed and technology leaders are encouraging university computer science departments to strengthen their parallel processing coursework.

Privet2007 писал(а):Граждане, объясните, пожалуйста, как сравнить процессоры single core versus double core. Если есть single core процессор Интел 3.0 ghz, это тоже самое по скорости, что Интел 1.5 ghz dual core? Или там другая математика?
И ещё, насколько processor cache увеличивает скорость? Если сравнить 3M L2 Cache и 6M L2 Cache, то насколько существенна разница?
Заранее спасибо!

Sturgeon писал(а):Хе-хе

By 2015, the strategy of running chips at increasingly higher frequencies could create products that generate as much heat as a nuclear reactor, according to engineers, so multi-core processing is largely considered the future of computing. "There is a fundamental physics issue we can no longer get around," says Intel's Anwar Ghuloum. "If we kept going as we had been, the heat density on a chip would have equaled the surface of the sun." The first products based on the Larrabee chip are expected to be released in 2009 or 2010. The problem with the multi-core approach is that it will require an equally dramatic shift in software. To utilize the processing power contained in a multi-core chip, software will need to be divided into chucks of instructions that can run in parallel on multiple processors. Once chips with 10 cores are available in consumer products, much of today's existing software may have to be rewritten to take advantage of the extra processing capabilities. New programming languages are being developed and technology leaders are encouraging university computer science departments to strengthen their parallel processing coursework.

Золотые времена для нас, PhD студентов от Computer Science.

Marmot писал(а):

Sturgeon писал(а):Хе-хе

By 2015, the strategy of running chips at increasingly higher frequencies could create products that generate as much heat as a nuclear reactor, according to engineers, so multi-core processing is largely considered the future of computing. "There is a fundamental physics issue we can no longer get around," says Intel's Anwar Ghuloum. "If we kept going as we had been, the heat density on a chip would have equaled the surface of the sun." The first products based on the Larrabee chip are expected to be released in 2009 or 2010. The problem with the multi-core approach is that it will require an equally dramatic shift in software. To utilize the processing power contained in a multi-core chip, software will need to be divided into chucks of instructions that can run in parallel on multiple processors. Once chips with 10 cores are available in consumer products, much of today's existing software may have to be rewritten to take advantage of the extra processing capabilities. New programming languages are being developed and technology leaders are encouraging university computer science departments to strengthen their parallel processing coursework.

Золотые времена для нас, PhD студентов от Computer Science.

Я надеюсь "PhD студенты от Computer Science" знают что им не надо ждать 2009-10гг а можно использовать процессоры от SUN T2 прямо сейчас?

Marmot писал(а):Я надеюсь "PhD студенты от Computer Science" знают что им не надо ждать 2009-10гг а можно использовать процессоры от SUN T2 прямо сейчас?

Stanislav писал(а):

Marmot писал(а):Я надеюсь "PhD студенты от Computer Science" знают что им не надо ждать 2009-10гг а можно использовать процессоры от SUN T2 прямо сейчас?

Как же его использовать, если у него цена от самолета!

Sturgeon писал(а):

Marmot писал(а):

Sturgeon писал(а):Хе-хе

By 2015, the strategy of running chips at increasingly higher frequencies could create products that generate as much heat as a nuclear reactor, according to engineers, so multi-core processing is largely considered the future of computing. "There is a fundamental physics issue we can no longer get around," says Intel's Anwar Ghuloum. "If we kept going as we had been, the heat density on a chip would have equaled the surface of the sun." The first products based on the Larrabee chip are expected to be released in 2009 or 2010. The problem with the multi-core approach is that it will require an equally dramatic shift in software. To utilize the processing power contained in a multi-core chip, software will need to be divided into chucks of instructions that can run in parallel on multiple processors. Once chips with 10 cores are available in consumer products, much of today's existing software may have to be rewritten to take advantage of the extra processing capabilities. New programming languages are being developed and technology leaders are encouraging university computer science departments to strengthen their parallel processing coursework.

Золотые времена для нас, PhD студентов от Computer Science.

Я надеюсь "PhD студенты от Computer Science" знают что им не надо ждать 2009-10гг а можно использовать процессоры от SUN T2 прямо сейчас?

Не только знаем - непосредственно используем Цитатой я выделил просто dramatic shift, Larrabee тут, в общем то, не важен.

Marmot писал(а):

Sturgeon писал(а):

Marmot писал(а):

By 2015, the strategy of running chips at increasingly higher frequencies could create products that generate as much heat as a nuclear reactor, according to engineers, so multi-core processing is largely considered the future of computing. "There is a fundamental physics issue we can no longer get around," says Intel's Anwar Ghuloum. "If we kept going as we had been, the heat density on a chip would have equaled the surface of the sun." The first products based on the Larrabee chip are expected to be released in 2009 or 2010. The problem with the multi-core approach is that it will require an equally dramatic shift in software. To utilize the processing power contained in a multi-core chip, software will need to be divided into chucks of instructions that can run in parallel on multiple processors. Once chips with 10 cores are available in consumer products, much of today's existing software may have to be rewritten to take advantage of the extra processing capabilities. New programming languages are being developed and technology leaders are encouraging university computer science departments to strengthen their parallel processing coursework.

Я надеюсь "PhD студенты от Computer Science" знают что им не надо ждать 2009-10гг а можно использовать процессоры от SUN T2 прямо сейчас?

Не только знаем - непосредственно используем Цитатой я выделил просто dramatic shift, Larrabee тут, в общем то, не важен.

Ну может он где-нибудь и dramatic , а на сервер сайде иметь >500 threads уже давно норма жизни.

Sturgeon писал(а): Ну так то какая норма жизни? Ежели на каждую транзакцию по нити - так это и больше чем 500 можно назвать примеры, чего ж мелочиться то
В цитате то не про транзакции ведь совсем.

Marmot писал(а):

Sturgeon писал(а): Ну так то какая норма жизни? Ежели на каждую транзакцию по нити - так это и больше чем 500 можно назвать примеры, чего ж мелочиться то
В цитате то не про транзакции ведь совсем.

Я не уверен в семантике слова "транзакция" в данном контексте.
Объясню попроще, в современных backend-ах довольно типично использование массового horizontal partitioning данных.
В таких условиях параллельный доступ и обработка данных являются вполне естественными.

Sturgeon писал(а):

Marmot писал(а):

Sturgeon писал(а): Ну так то какая норма жизни? Ежели на каждую транзакцию по нити - так это и больше чем 500 можно назвать примеры, чего ж мелочиться то
В цитате то не про транзакции ведь совсем.

Я не уверен в семантике слова "транзакция" в данном контексте.
Объясню попроще, в современных backend-ах довольно типично использование массового horizontal partitioning данных.
В таких условиях параллельный доступ и обработка данных являются вполне естественными.

Транзакция здесь - это просто инициированный клиентом процесс передачи данных от сервера, обслуженный запрос.

А почему типично - потому что серверные задачи, основанные на обслуживании схожих по структуре запросов от многих клиентов, легко распараллелить. Вполне естесственно и очевидно. Современная ситуация такова, что необходимо распараллеливать не только подобного рода серверные приложения, но и все остальные приложения вообще.