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These "in-flight" instructions can retire at any time, depending on memory access, hits in cache, stalls in the pipeline and many other factors. This can cause performance counter events to be attributed to the wrong instructions, making precise performance analysis difficult or impossible. AMD introduced methods to mitigate some of these ...
Counter multiplexing and overflow handling are also supported. Operating system support for accessing hardware counters is needed to use PAPI. For example, prior to 2010, a Linux/x86 kernel had to be patched with a performance monitoring counters driver (perfctr link ) to support PAPI.
The High Precision Event Timer (HPET) is a hardware timer available in modern x86-compatible personal computers.Compared to older types of timers available in the x86 architecture, HPET allows more efficient processing of highly timing-sensitive applications, such as multimedia playback and OS task switching.
The interface between the perf utility and the kernel consists of only one syscall and is done via a file descriptor and a mapped memory region. [6] Unlike LTTng or older versions of oprofile, no service daemons are needed, as most functionality is integrated into the kernel.
A frequency counter is an electronic instrument, or component of one, that is used for measuring frequency. Frequency counters usually measure the number of cycles of oscillation or pulses per second in a periodic electronic signal .