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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 ...
Here, a processor may be a (single-core) CPU or one core in a multi-core CPU. Example: A software application executed on a four-core processor creates four Unix processes. If each process is able to execute on a separate processor core, computation proceeds on four processor cores simultaneously.
Front panel of an IBM 701 computer introduced in 1952. Lights in the middle display the contents of various registers. The instruction counter is at the lower left.. The program counter (PC), [1] commonly called the instruction pointer (IP) in Intel x86 and Itanium microprocessors, and sometimes called the instruction address register (IAR), [2] [1] the instruction counter, [3] or just part of ...
Computer processing efficiency, measured as the power needed per million instructions per second (watts per MIPS) Instructions per second (IPS) is a measure of a computer's processor speed.
16 KiB per core 2×1 MiB – 2×2 MiB N/A Pentium Dual-Core: E2xxx E3xxx E5xxx T2xxx T3xxx Allendale Penryn Wolfdale Yonah: 2006–2009 1.6 GHz – 2.93 GHz Socket 775 Socket M Socket P Socket T: 45 nm, 65 nm 10 W – 65 W 2 533 MHz, 667 MHz, 800 MHz, 1066 MHz 64 KiB per core 1 MiB – 2 MiB N/A Intel Pentium (2009) E2xx0 E5xxx E6xxx T2xxx T3xx ...
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The average of Cycles Per Instruction in a given process (CPI) is defined by the following weighted average: := () = () Where is the number of instructions for a given instruction type , is the clock-cycles for that instruction type and = is the total instruction count.