Add import time tests for arpack.

benchmarks/arpack/arpack_import.py

@@ -0,0 +1,11 @@
+import time
+
+start = time.perf_counter()
+import numpy as np
+import scipy.sparse as sparse
+import scipy.sparse.linalg as sla
+
+from test_data import discrete_laplacian
+stop = time.perf_counter()
+print(stop - start)
+

benchmarks/arpack/arpack_vec_import.py

@@ -0,0 +1,17 @@
+import os
+import sys
+import time
+
+start = time.perf_counter()
+from parla.multiload import multiload, multiload_contexts
+
+nworkers = int(sys.argv[1])
+
+for i in range(nworkers):
+    with multiload_contexts[i] as VEC:
+        #print("start setup for VEC {}".format(i), file = sys.stderr)
+        import numpy as np
+        import scipy.sparse as sparse
+        import scipy.sparse.linalg as sla
+stop = time.perf_counter()
+print(stop - start)