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Idle is a state that a computer processor is in when it is not being used by any program. Every program or task that runs on a computer system occupies a certain amount of processing time on the CPU. If the CPU has completed all tasks it is idle. Modern processors use idle time to save power.
Because of the idle process's function, its CPU time measurement (visible through, for example, Windows Task Manager) may make it appear to users that the idle process is monopolizing the CPU. However, the idle process does not use up computer resources (even when stated to be running at a high percent). Its CPU time "usage" is a measure of how ...
Mode protection may extend to resources beyond the CPU hardware itself. Hardware registers track the current operating mode of the CPU, but additional virtual-memory registers, page-table entries, and other data may track mode identifiers for other resources. For example, a CPU may be operating in Ring 0 as indicated by a status word in the CPU ...
The idle wait is necessary when the access is to a ready list for a low level scheduling operation. The idle wait is not necessary but convenient in the case of a critical section for synchronization/IPC operations, which require less time than a context switch (executing another process to avoid idle wait). Idle wait is instead not convenient ...
CPU GPU Memory support TDP Junction temp. range (°C) Cores Clock rate Cache Model Config [i] Clock (GHz) Processing power [ii] Base Boost L1 L2 L3; V1202B: February 2018 GloFo 14LP: 2 (4) 2.3 3.2 64 KB inst. 32 KB data per core: 512 KB per core: 4 MB Vega 3 192:12:16 3 CU 1.0 384 DDR4-2400 dual-channel: 12–25 W 0–105 V1404I: December 2018 ...
Prefetch data to all levels of the cache hierarchy. [b] PREFETCHT1 m8: 0F 18 /2: Prefetch data to all levels of the cache hierarchy except L1 cache. [b] PREFETCHT2 m8: 0F 18 /3: Prefetch data to all levels of the cache hierarchy except L1 and L2 caches. [b] SFENCE: NP 0F AE F8+x [c] Store Fence. [d] SSE2 (non-SIMD) LFENCE: NP 0F AE E8+x [c]
In many applications, the CPU and other components are idle much of the time, so idle power contributes significantly to overall system power usage. When the CPU uses power management features to reduce energy use, other components, such as the motherboard and chipset, take up a larger proportion of the computer's energy.
Intel Haswell Core i7-4771 CPU, sitting atop its original packaging that contains an OEM fan-cooled heatsink. This generational list of Intel processors attempts to present all of Intel's processors from the 4-bit 4004 (1971) to the present high-end offerings. Concise technical data is given for each product.