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CPU time (or process time) is the amount of time for which a central processing unit (CPU) was used for processing instructions of a computer program or operating system, as opposed to elapsed time, which includes for example, waiting for input/output (I/O) operations or entering low-power (idle) mode. The CPU time is measured in clock ticks or ...
Instructions per second. Instructions per second ( IPS) is a measure of a computer 's processor speed. For complex instruction set computers (CISCs), different instructions take different amounts of time, so the value measured depends on the instruction mix; even for comparing processors in the same family the IPS measurement can be problematic.
In computer science and computer programming, system time represents a computer system's notion of the passage of time. In this sense, time also includes the passing of days on the calendar . System time is measured by a system clock, which is typically implemented as a simple count of the number of ticks that have transpired since some ...
Epoch (computing) In computing, an epoch is a fixed date and time used as a reference from which a computer measures system time. Most computer systems determine time as a number representing the seconds removed from a particular arbitrary date and time. For instance, Unix and POSIX measure time as the number of seconds that have passed since ...
A picosecond (abbreviated as ps) is a unit of time in the International System of Units (SI) equal to 10 −12 or 1⁄1 000 000 000 000 (one trillionth) of a second. That is one trillionth, or one millionth of one millionth of a second, or 0.000 000 000 001 seconds. A picosecond is to one second as one second is to approximately 31,689 years.
Unix time passed 1 000 000 000 seconds on 2001-09-09T01:46:40Z. [1] It was celebrated in Copenhagen, Denmark at a party held by the Danish UNIX User Group at 03:46:40 local time. Unix time [ a ] is a date and time representation widely used in computing .
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10−18 s. An attosecond (abbreviated as as) is a unit of time in the International System of Units (SI) equal to 10 −18 or 1 ⁄ 1 000 000 000 000 000 000 (one quintillion) of a second. [ 1] An attosecond is to a second as a second is to about 31.71 billion years. [ 2] The attosecond is a tiny unit but it has various potential applications ...