I know OS schedules thread and CPU executes it and there is direct relationship between no of threads and no of cores.Is that mean single processor with multiple cores (say n) is same as that of n single core processors, I mean In both of these cases processing ability is same or there is some difference?
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yes, there is a difference, but for normal programming decisions the difference is almost insignificant and too low-level.
Intel® 64 and IA-32 Architectures Software Developer’s Manual contains some explanation in chapters "Intel® Hyper-Threading Technology" and "Multi-Core Technology"
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