mg2d: relax the condition on residual convergence

Apparently in certain cases the residual can briefly grow, even though
the process converges after.

1 files changed, 1 insertions, 1 deletions

diff --git a/mg2d.c b/mg2d.c
index 453a9c4..0cb9dd8 100644
--- a/mg2d.c
+++ b/mg2d.c
@@ -548,7 +548,7 @@ int mg2d_solve(MG2DContext *ctx)
         mg2di_log(&priv->logger, MG2D_LOG_VERBOSE,
                   "finished toplevel iteration %d, residual %g -> %g (%g)\n",
                   i, res_prev, res_cur, res_prev / res_cur);
-        if (res_cur / res_prev > 1.0) {
+        if (res_cur / res_prev > 1e1) {
             mg2di_log(&priv->logger, MG2D_LOG_ERROR, "A multigrid iteration diverged\n");
             ret = MG2D_ERR_DIVERGE;
             goto fail;