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The Time Stamp Counter was once a high-resolution, low-overhead way for a program to get CPU timing information. With the advent of multi-core/hyper-threaded CPUs, systems with multiple CPUs, and hibernating operating systems, the TSC cannot be relied upon to provide accurate results — unless great care is taken to correct the possible flaws: rate of tick and whether all cores (processors ...
High Precision Event Timer. 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.
If the returned values in EBX and ECX of leaf 15h are both nonzero, then the TSC (Time Stamp Counter) frequency in Hz is given by TSCFreq = ECX*(EBX/EAX). On some processors (e.g. Intel Skylake ), CPUID_15h_ECX is zero but CPUID_16h_EAX is present and not zero.
However, the time stamp counter is not a procedure in itself; it is a component of a procedure. Throwing a bunch of code in that does nothing more than read out the time stamp counter does not help with understanding the point, purpose, or use of the time stamp counter, any more than code that simply loads the instruction pointer into the ...
Read 64-bit Time Stamp Counter (TSC) into EDX:EAX. [l] In early processors, the TSC was a cycle counter, incrementing by 1 for each clock cycle (which could cause its rate to vary on processors that could change clock speed at runtime) – in later processors, it increments at a fixed rate that doesn't necessarily match the CPU clock speed. [m]
Timestamping (computing) In computing, timestamping refers to the use of an electronic timestamp to provide a temporal order among a set of events. Timestamping techniques are used in a variety of computing fields, from network management and computer security to concurrency control. [1] [2] For instance, a heartbeat network uses timestamping ...
Lamport timestamp. The Lamport timestamp algorithm is a simple logical clock algorithm used to determine the order of events in a distributed computer system. As different nodes or processes will typically not be perfectly synchronized, this algorithm is used to provide a partial ordering of events with minimal overhead, and conceptually ...
A higher-valued timestamp occurs later in time than a lower-valued timestamp. Generating a timestamp. A number of different approaches can generate timestamps Using the value of the system's clock at the start of a transaction as the timestamp. Using a thread-safe shared counter that is incremented at the start of a transaction as the timestamp.
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