Add an option to specify time format

str(float) prints 16 decimal places, which is too verbose and much more
than the precision in the profiles. Print 7 digits by default and allow
setting the format with --time-format.

gprof2dot.py

@@ -44,6 +44,7 @@
 
 
 MULTIPLICATION_SIGN = chr(0xd7)
+timeFormat = "%.7g"
 
 
 def times(x):
@@ -52,6 +53,9 @@ def times(x):
 def percentage(p):
     return "%.02f%%" % (p*100.0,)
 
+def fmttime(t):
+    return timeFormat % t
+
 def add(a, b):
     return a + b
 
@@ -112,7 +116,7 @@ def __str__(self):
         return 'unspecified event %s' % self.event.name
 
 
-class Event(object):
+class Event:
     """Describe a kind of event, and its basic operations."""
 
     def __init__(self, name, null, aggregator, formatter = str):
@@ -124,12 +128,6 @@ def __init__(self, name, null, aggregator, formatter = str):
     def __repr__(self):
         return self.name
 
-    def __eq__(self, other):
-        return self is other
-
-    def __hash__(self):
-        return id(self)
-
     def null(self):
         return self._null
 
@@ -159,9 +157,9 @@ def format(self, val):
 # Used only when totalMethod == callstacks
 TOTAL_SAMPLES = Event("Samples", 0, add, times)
 
-TIME = Event("Time", 0.0, add, lambda x: '(' + str(x) + ')')
+TIME = Event("Time", 0.0, add, lambda x: '(' + fmttime(x) + ')')
 TIME_RATIO = Event("Time ratio", 0.0, add, lambda x: '(' + percentage(x) + ')')
-TOTAL_TIME = Event("Total time", 0.0, fail)
+TOTAL_TIME = Event("Total time", 0.0, fail, fmttime)
 TOTAL_TIME_RATIO = Event("Total time ratio", 0.0, fail, percentage)
 
 labels = {
@@ -175,7 +173,7 @@ def format(self, val):
 totalMethod = 'callratios'
 
 
-class Object(object):
+class Object:
     """Base class for all objects in profile which can store events."""
 
     def __init__(self, events=None):
@@ -184,12 +182,6 @@ def __init__(self, events=None):
         else:
             self.events = events
 
-    def __hash__(self):
-        return id(self)
-
-    def __eq__(self, other):
-        return self is other
-
     def __lt__(self, other):
         return id(self) < id(other)
 
@@ -3632,7 +3624,7 @@ def naturalJoin(values):
 def main(argv=sys.argv[1:]):
     """Main program."""
 
-    global totalMethod
+    global totalMethod, timeFormat
 
     formatNames = list(formats.keys())
     formatNames.sort()
@@ -3697,6 +3689,10 @@ def main(argv=sys.argv[1:]):
         action="store_true",
         dest="show_samples", default=False,
         help="show function samples")
+    optparser.add_option(
+        '--time-format',
+        default=timeFormat,
+        help="format to use for showing time values [default: %default]")
     optparser.add_option(
         '--node-label', metavar='MEASURE',
         type='choice', choices=labelNames,
@@ -3785,6 +3781,7 @@ def main(argv=sys.argv[1:]):
         theme.skew = options.theme_skew
 
     totalMethod = options.totalMethod
+    timeFormat = options.time_format
 
     try:
         Format = formats[options.format]