WebAug 1, 2010 · I checked the differences between TSC on different cores, using an exciting-reacting algorithm, on a Linux Debian machine with core i5 processor. The exciter process (in one core) writed the TSC in a shared variable, when the reacting process detected a … WebJul 12, 2024 · The X86 Timestamp Counter (TSC) is a Tickless counter which can be read using the RDTSCor RDTSCPinstruction. Initially, the computer reads latest time from the battery-powered CMOS Real Time Clock to initialize other clocks in the system. Hardware Timekeeping Devices PIT

Pitfalls of TSC usage Oliver Yang

Webrdtsc counts reference cycles, not CPU core clock cycles. It counts at a fixed frequency … WebApr 17, 2013 · The TSCs are not guaranteed to be synchronized although the OS usually … hybrid scholar 247

Time Stamp Counter - Wikipedia

WebJan 5, 2024 · That test uses RDTSC to take samples with better than millisecond precision. Increasing iteration count per sample lets the test cover a longer duration to capture quick clock speed shifts, but without creating a gigantic spreadsheet of doom. I also ran the test on every core. Results were consistent on the same core, but not across cores. http://oliveryang.net/2015/09/pitfalls-of-TSC-usage/ Webrdtsc counts reference cycles, not CPU core clock cycles It counts at a fixed frequency regardless of turbo / power-saving, so if you want uops-per-clock analysis, use performance counters. rdtsc is exactly correlated with wall-clock time (except for system clock adjustments, so it's basically steady_clock ). hybrid sativa or indica