6 6 votes The number of logical CPUs in a computer having two physical quad-core chips with hyper threading enabled is ______ $1$ $2$ $8$ $16$ CO & Architecture co-and-architecture isro2014 cpu non-gatecse + – ajit 6.4k views answer comment Share Follow Print 0 reply Please log in or register to add a comment.
Best answer 5 5 votes 2 * 4 physical cores * 2 = 16 logical cores. I'm not sure if we can call this logical CPU. But Hyper Threading is vendor specific and hence out of GATE scope. https://en.wikipedia.org/wiki/Hyper-threading Hyper Threading is Intel implementation of Simultaneous Multi-Threading (SMP). SMP means the CPU executes instructions from 2 different threads on the same physical core. For the OS, this appears as 2 different logical cores and this enables to have better pipeline efficiency in hardware. Arjun answered Sep 8, 2015 • edited Jun 20, 2016 by Arjun Arjun comment Share Follow See all 3 Comments 3 3 Comments reply Sourabh Kumar commented Jun 16, 2016 reply Follow flag Arjun sir why we multiply .with again 2 for logical CPU. 0 0 replyShare Isha Gupta commented Jun 20, 2016 reply Follow flag answer should be 8 or 16? 0 0 replyShare cse23 commented Jun 20, 2016 reply Follow flag In hyperthreading, every physical CPU corresponds to 2 logical CPU There are two quad core chips so total no. of physical CPU = 2*4 =8 now, 8 physical CPU corresponds to 2*8 = 16 logical CPU 14 14 replyShare Please log in or register to add a comment.
