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MPI1/AMR validation fix #679

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MPI1/AMR validation fix #679

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d58654f
Removed ``first_through`` entirely from ``timestep.c``.
yapolyak Sep 14, 2026
84ae77c
Explicitly initialized send_buf and recv_buf to NULL
yapolyak Sep 14, 2026
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9 changes: 4 additions & 5 deletions MPI1/AMR/timestep.c
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Original file line number Diff line number Diff line change
Expand Up @@ -83,7 +83,7 @@ void get_BG_data(int load_balance, DTYPE *in_bg, DTYPE *ing_r, int my_ID, long e

long send_vec[8], *recv_vec, offset, i, j, p, acc_send, acc_recv;
int *recv_offset, *recv_count, *send_offset, *send_count;
DTYPE *recv_buf, *send_buf;
DTYPE *recv_buf = NULL, *send_buf = NULL;

if (load_balance == no_talk) {
/* in case of no_talk we just copy the in-rank data from BG to refinement */
Expand Down Expand Up @@ -318,8 +318,7 @@ void time_step(int Num_procs,
MPI_Request request_bg[8],
MPI_Request request_r[4][8],
MPI_Comm comm_r[4],
MPI_Comm comm_bg,
int first_through) {
MPI_Comm comm_bg) {

int g, i, j, ii, jj, kk, sub_iter;

Expand Down Expand Up @@ -405,9 +404,9 @@ void time_step(int Num_procs,
}
}

if (!(iter%period) || first_through) {
if (!(iter%period)) {
/* a specific refinement has come to life */
g=(iter/period)%4; first_through=0;
g=(iter/period)%4;

get_BG_data(load_balance, in_bg, in_r[g], my_ID, expand, Num_procs,
L_width_bg, L_istart_bg, L_iend_bg, L_jstart_bg, L_jend_bg,
Expand Down