CPU Usage not improved

[yingemmachen]

Hi,

I used parallel_for in my visual c++ program. When I ran the program, the windows task manager showed that the total threads increased while the CPU usage did not change much (still about 15%).

Do you have any suggestion why this happens? My pc has intel core i7 CPU.

thanks,

Ying

[TimP]

As you are using TBB, you would probably get more expert help on that forum than here.

[yingemmachen]

Thanks. I am new here. Could you please tell me what forum I should post questions about TBB?

[TimP]

http://software.intel.com/en-us/forums/intel-threading-building-blocks/

[Alexander_Agathos]

You should take a look at this example :

http://msdn.microsoft.com/en-us/library/dd728073.aspx

It is a matrix multiplication. It says that that the function to be parallelized is of crucial importance in load balancing. Make some examples of your own.

Edit : Well PPL is also a joint work with Intel. Ok. Next time it would be great specifying the version of VS you are using. Cheers.