High physical memory usage is often a consequence of using too many demanding apps, but can also be the result of a bug in a process that would normally be far less resource-intensive. Slow processing can stem from a variety of different causes, some of which will be more difficult to fix than others. But in the vast majority of cases, if you’re wondering how to lower CPU usage, the process is actually as simple as pressing Control + Shift + ESC. Once you’ve confirmed that you do indeed have an overheating CPU, then it’s time to try and identify what the cause could be. The possible problems may reside on the software or hardware side of your PC, so there’s quite a bit to get through.
Typically, the operating system will catch and handle this exception. A software interrupt is requested by the processor itself upon executing particular instructions or when certain conditions are met.
After servicing a device, the processor may again poll and, if necessary, service other devices before exiting the ISR. A level-triggered interrupt is requested by holding the interrupt signal at its particular active logic level. A device invokes a level-triggered interrupt by driving the signal to and holding it at the active level.
Therefore, normally interrupts remain disabled inside the handler until the handler exits, where the RETI instruction will eventually re-enable further interrupts. For most interrupt handlers, this is the desired behaviour, for some it is even required in order to prevent infinitely recursive interrupts (like UART interrupts, or level-triggered external interrupts). If you set the interrupt enable flag within the current interrupt as well, then you can allow further interrupts that are higher priority than the one being executed. This "interrupt of an VLC download interrupt" is called a nested interrupt.
It’s ultimately the software that can allow or disallow nested interrupts. Constantly scanning your hard drive for potential threats can take up a surprising amount of CPU power, especially if you’re using an older device or OS.
It negates the signal when the processor commands it to do so, typically after the device has been serviced. Software interrupts may also be unexpectedly triggered by program execution errors. These interrupts typically are called traps or exceptions. For example, a divide-by-zero exception will be "thrown" if the processor executes a divide instruction with divisor equal to zero.
Every software interrupt signal is associated with a particular interrupt handler. Some interrupt signals are not affected by the interrupt mask and therefore cannot be disabled; these are called non-maskable interrupts . NMIs indicate high priority events which cannot be ignored under any circumstances, such as the timeout signal from a watchdog timer. The AVR hardware clears the global interrupt flag in SREG before entering an interrupt vector.
If the device starts lagging at random times, it might be the result of an antivirus that’s eating into your processor load. To stop it, use your antivirus’s scheduling function to make sure it only scans your device during times that you aren’t likely to use it.
It is handled by stopping execution of the original service routine and storing another sequence of registers on the stack. Interrupts can be nested to any depth, limited only by the amount of memory available for the stack. You didn’t supply enough information – the CPU itself is only part of the story.