why HD Graphics 630 run classification slower than i5 7500 CPU?

[mahaoyanghb]

my environment: windows 10 enterprise cpu: i5 7500 3.4GHz 4Core graphics: HD Graphics 630

I download this code ,and compile it by instruction in this website. I add some code to measure forward time by clock() function. clock_t start, finish;

start = clock(); for (int i = 0; i < 10;i++) { classifier.Classify(img); } finish = clock(); std::cout << "cost " << difftime(finish,start)/10<<" ms"<< std::endl;

after I compared GPU mode and CPU mode, I found that classification.exe runs 10 times slower in graphics mode than in CPU mode . CPU : 8ms HD Graphics: 80ms

HD graphics card should run faster than CPU , shouldn't it ? why it runs much more slow?

remark: OpenCL is downloaded from intel I have checked caffe recognize the true opencl dir. the only change is I remove the HAS_HALF_SUPPORT definition , because clblas.h don't have half precision functions.

does anybody know the reason? Thank you very much!