Improve logging of vectorization strategy

python/dune/perftool/sumfact/vectorization.py

@@ -176,9 +176,9 @@ def decide_vectorization_strategy():
     qp, sfdict = level1_optimal_vectorization_strategy(active_sumfacts, width)
 
     set_quadrature_points(qp)
-
-    logger.debug("decide_vectorization_strategy: Decided for the following strategy:"
-                 "\n".join(stringify_vectorization_strategy((qp, sfdict))))
+    logger.debug("decide_vectorization_strategy: Decided for the following strategy:" +
+                 "\n  " +
+                 "\n  ".join(stringify_vectorization_strategy((qp, sfdict))))
 
     # We map inactive sum factorization kernels to 0
     sfdict = add_to_frozendict(sfdict, {sf: 0 for sf in inactive_sumfacts})