If this were a quad-core machine, I might suspect OneDrive was completely using a single CPU. In this example, it’s OneDrive - or rather, the OneDrive service - that’s the biggest current user of CPU: 26.4%. This will sort the list of running software in order of decreasing processor usage. Not only will you see many more programs listed, you’ll see the system resources each is using.Ĭlick on the “CPU” column header. 3 We want to know about everything, including the software making up Windows itself.Ĭlick on More details near the bottom of the window. The initial view may be exceptionally unhelpful.īy default, Task Manager only displays those programs you’ve explicitly run. Right-click on the clock and click on Task Manager. In Windows 10 2, Task Manager helps us determine what program is hogging the CPU. Sometimes, it’s a bug or a sign of some other problem. Sometimes, it’s the right thing to do what you’ve asked the program to do requires all available computing power. On the other hand, if the software was written to utilize all available CPUs - “multi-threaded” software - it’s not uncommon for a CPU hog to fully utilize all the available CPUs. You might see a solid 25% CPU usage on a quad-core computer, for example. If the software was written assuming a single CPU - so-called “single-threaded” software - you’ll see one core of a multi-core processor fully used 1 while the other cores remain available for other things. Exactly how that manifests on modern multi-core machines depends on how the software was written. When one program needs all of the CPU’s attention, other programs that also need the CPU might not get enough time to do their work. The magic is that the computer is constantly switching back and forth between all those things so quickly that it looks like they’re all happening at once. A dual-core machine can do exactly and only two things at a time, a quad-core can do four, and so on.īe it one core or dozens, to you and me it looks like one computer doing several things at once - many more things than it has cores. More precisely, each computer’s core can only do one thing at a time. Multitasking is a lieĪll evidence to the contrary, computers can only do one thing at a time. Windows Task Manager can show you who’s using all the CPU. When a task performs intense calculations, or just has a bug, it can “hog” or use all your CPU, preventing other tasks from running smoothly or at all. It seems like more because they’re switching between tasks faster than we can see. Computer CPU cores can only do one thing at a time.
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