update README (#243)

README.md

@@ -27,6 +27,12 @@ See the [Getting Started](https://hatchet.readthedocs.io/en/latest/getting_start
 
 Examples of performance analysis using hatchet are available [here](https://hatchet.readthedocs.io/en/latest/advanced_examples.html).
 
+### Contributing
+
+Hatchet is an open source project. We welcome contributions via pull requests
+and questions, feature requests or bug reports via issues.
+
+You can also reach the hatchet developers by email at: [hatchet-help@listserv.umd.edu](mailto:hatchet-help@listserv.umd.edu).
 
 ### Authors
 

hatchet/cython_modules/subtract_metrics.pyx

@@ -1,17 +1,22 @@
-import cython
-
-# @cython.boundscheck(False)
-def subtract_exclusive_metric_vals(long nid, long parent_nid, double[:] metrics, long num_stmt_nodes, long stride):
-  cdef long ref_nid = nid
-  cdef long ref_pnid = parent_nid
-
-  # compiler directive
-  with cython.boundscheck(False):
-  # we are modifying metrics in place here
-  # since they are passed by refrence via their
-  # memory
-    for i in range(num_stmt_nodes):
-      metrics[ref_pnid-1] -= metrics[ref_nid-1]
-
-      ref_nid += stride
-      ref_pnid += stride
+# Copyright 2017-2020 Lawrence Livermore National Security, LLC and other
+# Hatchet Project Developers. See the top-level LICENSE file for details.
+#
+# SPDX-License-Identifier: MIT
+
+import cython
+
+# @cython.boundscheck(False)
+def subtract_exclusive_metric_vals(long nid, long parent_nid, double[:] metrics, long num_stmt_nodes, long stride):
+  cdef long ref_nid = nid
+  cdef long ref_pnid = parent_nid
+
+  # compiler directive
+  with cython.boundscheck(False):
+  # we are modifying metrics in place here
+  # since they are passed by refrence via their
+  # memory
+    for i in range(num_stmt_nodes):
+      metrics[ref_pnid-1] -= metrics[ref_nid-1]
+
+      ref_nid += stride
+      ref_pnid += stride