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r.sim: Replace custom chunk computation with OpenMP for loop #7995

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Merged
wenzeslaus merged 1 commit into from
Oct 2, 2026
Merged

r.sim: Replace custom chunk computation with OpenMP for loop #7995

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15 changes: 2 additions & 13 deletions raster/r.sim/simlib/hydro.c
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Original file line number Diff line number Diff line change
Expand Up @@ -150,21 +150,10 @@ void main_loop(const Setup *setup, const Geometry *geometry,
nwalka = 0;
sim->nstack = 0;

#pragma omp parallel firstprivate(l, lw, k) reduction(+ : nwalka)
#pragma omp parallel firstprivate(l, k) reduction(+ : nwalka)
{
#if defined(_OPENMP)
int steps = (sim->nwalk + omp_get_num_threads() - 1) /
omp_get_num_threads();
int tid = omp_get_thread_num();
int min_loop = tid * steps;
int max_loop = ((tid + 1) * steps) > sim->nwalk
? sim->nwalk
: (tid + 1) * steps;

for (lw = min_loop; lw < max_loop; lw++) {
#else
#pragma omp for schedule(static)
for (lw = 0; lw < sim->nwalk; lw++) {
#endif
if (sim->w[lw].m > EPS) { /* check the walker weight */
++(nwalka);
l = (int)((sim->w[lw].x + stxm) / geometry->stepx) -
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