ysh329 / openmp-101 Goto Github PK

I have been writing a code and have tried to parallelize it using #pragma omp parallel for. Everything works fine till about 100000 iterations but whe i increase the number of iterations to about 200000, it compiles without errors but while running shows the error "segmentation fault(core dumped) " immidiately.
I have been told that it might be local/global variable issue of the iteration variables but i think it is unlikely because it runs just fine if the number of iteration is lesser.
Also i have been told that it might be stack issue which i have no idea about

OpenMP简易教程 - 百度文库
https://wenku.baidu.com/view/21348f16a21614791711280b.html

Veinin/POSIX-threads-programming-tutorials: Summaries and notes on pthreads programming.
https://github.com/Veinin/POSIX-threads-programming-tutorials

Hello Sir/ Madam
We are from a research group at Iowa State University, USA. We want to do a survey on Github developers on the methods they used for paralleling their code. To do the survey, We want to ask three questions:

1. Have you ever tried to add pragma for that 'for' loop?.

2. How much confidence do you have about the correctness of this implementation? You can choose from 1-5 with 1 as the lowest confidence score and 5 as the highest confidence.

3. (Optional) Do you actually run (interpret the code with compilation and pass input/get output) the code? Yes/No

• If yes, can you provide the information of what are the input and expected output of this program (the input that caused the program to run through this for-loop).

The for loop is from line 63 of file https:/github.com/ysh329/OpenMP-101/blob/master/pi/my_pi.c
Here is a part of the code:

nan
for (i = start_step_num; i < finish_step_num; ++i)
{
x = (i + 0.5) * step;
sum = sum + (4.0 / (1.0 + (x * x)));
}

Sincerely thanks