CPU_CLK_UNHALTED for multithreaded application.

[Surya_Narayanan_N_]

I have the following doubt,

When we collect hw-events for a multi-threaded program in xeon-phi, the statistics for every he-event is given on cumulative basis or thread basis? for example, CPU_CLK_UNHALTED like the cpu time (when using linux 'time') gives a cumulative clock cycles utilized by the application on defined number of cores. Is this correct?

How are cache_fill and other hw-events reported? Is it an accumulation of all core events or just one core specified in the -collect cpu-mask in general?

[robert-reed]

CPU  clocks are shared among the HW threads of each core.  If you look at the description of CPI per core versus CPI per thread in http://software.intel.com/en-us/articles/optimization-and-performance-tuning-for-intel-xeon-phi-coprocessors-part-2-understanding, there is an attempt to describe this feature.

[TaylorIoTKidd]

Duplicate of http://software.intel.com/en-us/forums/topic/499801 (has own response).