allow disable resource_monitor appending with nipype option

Author: oesteban

doc/users/config_file.rst

@@ -162,6 +162,11 @@ Execution
     being used by an interface. Requires ``resource_monitor`` to be ``true``.
     (default value: ``1``)
 
+*resource_monitor_append*
+    Append to an existing ``resource_monitor.json`` in the workflow ``base_dir``.
+    (unset by default, possible values: ``true``, ``false``,
+    will append unless explicitly set to ``false``).
+
 Example
 ~~~~~~~
 

nipype/pipeline/engine/utils.py

@@ -1298,7 +1298,7 @@ def write_workflow_prov(graph, filename=None, format='all'):
     return ps.g
 
 
-def write_workflow_resources(graph, filename=None, append=True):
+def write_workflow_resources(graph, filename=None, append=None):
     """
     Generate a JSON file with profiling traces that can be loaded
     in a pandas DataFrame or processed with JavaScript like D3.js
@@ -1307,6 +1307,10 @@ def write_workflow_resources(graph, filename=None, append=True):
     if not filename:
         filename = os.path.join(os.getcwd(), 'resource_monitor.json')
 
+    if append is None:
+        append = str2bool(config.get(
+            'execution', 'resource_monitor_append', 'true'))
+
     big_dict = {
         'time': [],
         'name': [],