On Thursday, 28 March 2024 at 14:07:43 UTC, Salih Dincer wrote:
On Thursday, 28 March 2024 at 11:50:38 UTC, rkompass wrote:
Turning back to this: Are there similarly simple libraries for
C, that allow for
parallel computation?
You can achieve parallelism in C using libraries such as
OpenMP, which provides a set of compiler directives and runtime
library routines for parallel programming.
Here’s an example of how you might modify the code to use
OpenMP for parallel processing:
```c
. . .
#pragma omp parallel for reduction(+:result)
for (int s = ITERS; s >= 0; s -= STEPS) {
result += leibniz(s);
}
. . . ```
To compile this code with OpenMP support, you would use a
command like gcc -fopenmp your_program.c. This tells the GCC
compiler to enable OpenMP directives. The #pragma omp parallel
for directive tells the compiler to parallelize the loop, and
the reduction clause is used to safely accumulate the result
variable across multiple threads.
SDB@79
Nice, thank you.
It worked endlessly until I saw I had to correct the `for` to
`for (int s = ITERS; s > ITERS-STEPS; s--)`
Now the result is:
```
3.1415926535897936
Execution time: 0.212483 (seconds).
```
This result is sooo similar!
I didn't know that OpenMP programming could be that easy.
Binary size is 16K, same order of magnitude, although somewhat
less.
D advantage is gone here, I would say.
