The first thing to understand is that normal Python code cannot use GPU acceleration, only programs designed for the GPU can be run on the GPU. Hardware acceleration must be implemented in hardware language.
GPU concept correlation
Graphics Processing Unit (GPU) : a visual processor or Graphics display card.
GPU is responsible for rendering 2D, 3D and VR effects, mainly focusing on computer graphics and image field. Gpus have since been found to be well suited for parallel computing, speeding up modern scientific computing and moving beyond games and video.
No matter CPU or GPU, it is necessary to use Core (ALU+ register) to do arithmetic logic operation when performing calculation.
A core can only perform a certain task sequentially. In order to process more tasks in parallel at the same time, chip companies have developed a multi-core architecture. As long as there is no dependence between each other, each core does its own thing and the multi-cores do not interfere with each other, the effect of parallel computing can be achieved.
The limitations of the CPU
A PC CPU has only 2 to 8 cores, and a data server only has 20 to 40 cores, while a GPU has thousands of cores.
However, the CPU and GPU core are not the same, the GPU core can only focus on certain features of the task, while the CPU core has a wider range of computing power.
The CPU is more general, playing a role of coordination and management, while the GPU is limited to computing specific tasks.
The CPU reads and writes data from Main Memory and interacts with the GPU through the Bus.
In addition to many computing cores, gpus also have their own independent storage, called video memory.
GPU core in the calculation, can only directly read and write data from the video memory, programmers need to specify in the code which data need to be copied between memory and video memory, these data transmission is on the bus, so the bus (NVLink technology, PCI-E technology…) Transmission speed and bandwidth can also be bottlenecks for some computing tasks.
Because CPU and GPU are separate, in Nvidia's design philosophy, CPU and main memory are called hosts and GPU is called Device.
Use a combination of CPU and GPU to speed up computation, also known as heterogeneous computing.
The Summit, the world's no. 1 supercomputer, uses 9,216 IBM POWER9 cpus and 27,648 Nvidia Tesla Gpus.
When GPU is introduced, the calculation process becomes:
Class and copy the necessary data to the graphics memory of the GPU device.
The CPU invokes the GPU function to enable multiple GPU cores to compute at the same time.
CPU and GPU perform asynchronous computing.
Copy the GPU calculation result back to the host to obtain the calculation result.
The basic flow of CUDA programming is as follows:
Class and copy the necessary data to the graphics memory of the GPU device.
CUDA kernel functions are called with some granularity of parallelism using an execution configuration.
The CPU and GPU perform asynchronous computing.
Copy the GPU calculation results back to the host.
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