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Active-state power management (ASPM) is a power management mechanism for PCI Express devices to garner power savings while otherwise in a fully active state. Predominantly, this is achieved through active-state link power management; i.e., the PCI Express serial link is powered down when there is no traffic across it.
When enabled via the AHCI controller, this allows the SATA host bus adapter to enter a low-power state during periods of inactivity, thus saving energy. The drawback to this is increased periodic latency as the drive must be re-activated and brought back on-line before it can be used, and this will often appear as a delay to the end-user.
ASPM may refer to: ASPM, a human gene; Active State Power Management, a computer power management protocol; Aviation System Performance Metrics, ...
Advanced Configuration and Power Interface (ACPI) is an open standard that operating systems can use to discover and configure computer hardware components, to perform power management (e.g. putting unused hardware components to sleep), auto configuration (e.g. Plug and Play and hot swapping), and status monitoring. It was first released in ...
Power management happens in two ways; through the above-mentioned function calls from the APM driver to the BIOS requesting power state changes, and automatically based on device activity. In APM 1.0 and APM 1.1, power management is almost fully controlled by the BIOS. In APM 1.2, the operating system can control PM time (e.g. suspend timeout).
The power management for microprocessors can be done over the whole processor, or in specific components, such as cache memory and main memory. With dynamic voltage scaling and dynamic frequency scaling , the CPU core voltage , clock rate , or both, can be altered to decrease power consumption at the price of potentially lower performance.
In Honduras, the business-lending arm of the World Bank aligned itself with a key player in a land dispute that has left more than 130 people dead, including Gregorio Chávez, a preacher who went out to tend his garden one day and didn’t come back. In the last decade, the International Finance Corp.’s lending and influence has soared, even as it has embraced financing methods that shield ...
injection of reactive power into transmission lines causes losses that waste power, forcing an increase in power supplied by the prime mover. Use of specialized voltage control devices in the grid also improves the power system stability by reducing the fluctuations of the rotor angle of a synchronous generator (that are caused by generators ...