OpenMP-Stack overflow

[ali_z_]

Hi,
I'm trying to compare the cpu time when using the !$ open mp in nested loops compared to the one without it. 
I'm using MVS2012 with intel composer xe.
Problem is when i disable the process openmp directives in Language the code runs fine but the !$ open mp loop takes the same cpu time compared to normal loop and slightly higher. When switching the process openMP directives to Generate parallel code i get the stack overflow. The code is attached to this post. I'll be thankful if you can guide me to how to use the open mp properly with mvs/intel composer xe.  

Thanks in advance !

[Xiaoping_D_Intel · Accepted solution]

After enlarge the stack size to 20MB by setting "Project Properties -> Linker -> System -> Stack Reserve Size" to 20000000 the program can run without error. Detail info about stack size on Windows can be found at https://msdn.microsoft.com/en-us/library/8cxs58a6.aspx

Setting the number of bytes to allocate for each OpenMP* thread to use as the private stack for the thread can use environment variable "OMP_STACKSIZE". Detail about it can be found under the compiler user's guide and reference "Supported Environment Variables" topic.

Thanks,

Xiaoping Duan

Intel Customer Support

[ali_z_]

Many thanks, i appreciate it !