I have a M620 and M640 i7 laptops. In virutal box, I can get the M640 to give me only 2 CPU’s for divide between guest (XP) and host (W7). On the M620, I can use 4 CPU’s on the guest of 8 available CPU’s. Both machines are the same Lenovo T510, and both show 2 CPU’s/4 threads on the processor spec’s.
The problem is with CPU usage. On the machine with only one CPU available, I max out CPU usage at 100% which completely hangs Windows Explorer with W7 operations. I don’t have the problem with the M620 machine, I can run duel processes on the XP and W7 without issue.
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I am running Ubuntu 18 on a System76 Oryx Pro 4 with an i7 8th gen 6 cores.
As you can see from the following image, when all CPUs usage is <= 6%, all CPUs run at a frequency of 800MHz.
However, as soon as I run an infinite while loop in a terminal which causes only CPU5 usage to increase to 100%, all CPUs (even those with 0% usage) scale to 4,100 MHz which is the maximum CPU freq.
Is this the expected behavior? Also, is there any way that the behavior can be changed so that only the frequency of the CPU with 100% usage increases to the top speed.
There is a lot of research about techniques that try to reuse the previous result of an instruction, either memory loads or arithmetic, such as dynamic instruction reuse, value prediction, based on the concept of value locality.
What I wonder if there is any commercial CPU from Intel/AMD/ARM that actually uses any of these techniques, or are they still far away from being implemented in CPUs?
I mostly see these techniques as the runtime, CPU version of compiler optimizations such as common-subexpression elimination, loop invariant code motion, redundant load removal, catching cases that cannot be handled due to pointer aliasing, side-effects, etc.