The speed of a computer processor, or CPU, is determined by the Clock Cycle, which is the amount of time between two pulses of an oscillator. Generally speaking, the higher number of pulses per second, the faster the computer processor will be able to process information. The clock speed is measured in Hz, typically either … Read more
Here are theoretical max FLOPs counts (per core) for a number of recent processor microarchitectures and explanation how to achieve them. In general, to calculate this look up the throughput of the FMA instruction(s) e.g. on https://agner.org/optimize/ or any other microbenchmark result, and multiply (FMAs per clock) * (vector elements / instruction) * 2 (FLOPs … Read more
GPU get their speed for a cost. A single GPU core actually works much slower than a single CPU core. For example, Fermi GTX 580 has a core clock of 772MHz. You wouldn’t want your CPU with such a low core clock nowadays… The GPU however has several cores (up to 16) each operating in … Read more
The difference is whether the time is spent in user space or kernel space. User CPU time is time spent on the processor running your program’s code (or code in libraries); system CPU time is the time spent running code in the operating system kernel on behalf of your program.
A core is usually the basic computation unit of the CPU – it can run a single program context (or multiple ones if it supports hardware threads such as hyperthreading on Intel CPUs), maintaining the correct program state, registers, and correct execution order, and performing the operations through ALUs. For optimization purposes, a core can … Read more