diff --git a/README.md b/README.md
index 2655879..5e9bfa9 100644
--- a/README.md
+++ b/README.md
@@ -20,7 +20,8 @@ It can:
   * prune nodes and edges below a certain threshold;
   * use an heuristic to propagate time inside mutually recursive functions;
   * use color efficiently to draw attention to hot-spots;
-  * work on any platform where Python and Graphviz is available, i.e, virtually anywhere.
+  * work on any platform where Python and Graphviz is available, i.e, virtually anywhere;
+  * compare two graphs with identical structures for the analysis of performance metrics such as time or function calls.
 
 **If you want an interactive viewer for the graphs generated by _gprof2dot_, check [xdot.py](https://github.com/jrfonseca/xdot.py).**
 
@@ -129,7 +130,24 @@ Options:
                         variety to lower percentages.  Values > 1.0 give less
                         variety to lower percentages
   -p FILTER_PATHS, --path=FILTER_PATHS
-                        Filter all modules not in a specified path
+                       Filter all modules not in a specified path
+  --compare             Compare two graphs with identical structure. With this
+                        option two files should be provided.gprof2dot.py
+                        [options] --compare [file1] [file2] ...
+  --compare-tolerance=TOLERANCE
+                        Tolerance threshold for node difference
+                        (default=0.001%).If the difference is below this value
+                        the nodes are considered identical.
+  --compare-only-slower
+                        Display comparison only for function which are slower
+                        in second graph.
+  --compare-only-faster
+                        Display comparison only for function which are faster
+                        in second graph.
+  --compare-color-by-difference
+                        Color nodes based on the value of the difference.
+                        Nodes with the largest differences represent the hot
+                        spots.
 ```
 
 ## Examples
@@ -244,6 +262,32 @@ Example usage:
         py-spy record -p <pidfile> -f raw -o out.collapse
         gprof2dot.py -f collapse out.collapse | dot -Tpng -o output.png
 
+## Compare Example
+
+This image illustrates an example usage of the `--compare` and `--compare-color-by-difference` options.
+
+![Compare](./images/compare_diff.png)
+
+Arrow pointing to the right indicate node where the function performed faster
+in the profile provided as the second one (second profile), while arrow
+pointing to the left indicate node where the function was faster in the profile
+provided as the first one (first profile).
+
+### Node
+
+    +-----------------------------+
+    |        function name          \
+    | total time %  -/+ total_diff   \
+    | ( self time % ) -/+ self_diff  /
+    | total calls1 / total calls2   /
+    +-----------------------------+
+
+Where
+- `total time %` and `self time %` come from the first profile
+- `diff` is calculated as the absolute value of `time in the first profile - time in the second profile`.
+
+> **Note** The compare option has been tested for pstats and callgrind profiles.
+
 ## Output
 
 A node in the output graph represents a function and has the following layout:
diff --git a/gprof2dot.py b/gprof2dot.py
index 35c2d69..dfde3ab 100755
--- a/gprof2dot.py
+++ b/gprof2dot.py
@@ -57,6 +57,26 @@ def add(a, b):
 def fail(a, b):
     assert False
 
+# To enhance readability, labels are rounded to the number of decimal
+# places corresponding to the tolerance value.
+def round_difference(difference, tolerance):
+    n = -math.floor(math.log10(tolerance))
+    return round(difference, n)
+
+
+def rescale_difference(x, min_val, max_val):
+    return (x - min_val) / (max_val - min_val)
+
+
+def min_max_difference(profile1, profile2):
+    f1_events = [f1[TOTAL_TIME_RATIO] for _, f1 in sorted_iteritems(profile1.functions)]
+    f2_events = [f2[TOTAL_TIME_RATIO] for _, f2 in sorted_iteritems(profile2.functions)]
+    if len(f1_events) != len(f2_events):
+        raise Exception('Number of nodes in provided profiles are not equal')
+    differences = [abs(f1_events[i] - f2_events[i]) * 100 for i in range(len(f1_events))]
+
+    return min(differences), max(differences)
+
 
 tol = 2 ** -23
 
@@ -3252,6 +3272,122 @@ def wrap_function_name(self, name):
     show_function_events = [TOTAL_TIME_RATIO, TIME_RATIO]
     show_edge_events = [TOTAL_TIME_RATIO, CALLS]
 
+    def graphs_compare(self, profile1, profile2, theme, options):
+        self.begin_graph()
+
+        fontname = theme.graph_fontname()
+        fontcolor = theme.graph_fontcolor()
+        nodestyle = theme.node_style()
+
+        tolerance, only_slower, only_faster, color_by_difference = (
+            options.tolerance, options.only_slower, options.only_faster, options.color_by_difference)
+        self.attr('graph', fontname=fontname, ranksep=0.25, nodesep=0.125)
+        self.attr('node', fontname=fontname, style=nodestyle, fontcolor=fontcolor, width=0, height=0)
+        self.attr('edge', fontname=fontname)
+
+        functions2 = {function.name: function
+                      for _, function in sorted_iteritems(profile2.functions)}
+        if color_by_difference:
+            min_diff, max_diff = min_max_difference(profile1, profile2)
+        for _, function1 in sorted_iteritems(profile1.functions):
+            labels = []
+
+            name = function1.name
+            try:
+                function2 = functions2[name]
+            except KeyError:
+                raise Exception(f'Provided profiles does not have identical '
+                                f'structure, function that differ {name}')
+            if self.wrap:
+                name = self.wrap_function_name(name)
+            labels.append(name)
+            weight_difference = 0
+            shape = 'box'
+            orientation = '0'
+            for event in self.show_function_events:
+                if event in function1.events:
+                    event1 = function1[event]
+                    event2 = function2[event]
+
+                    difference = abs(event1 - event2) * 100
+
+                    if event == TOTAL_TIME_RATIO:
+                        weight_difference = difference
+                        if difference >= tolerance:
+                            if event2 > event1 and not only_faster:
+                                shape = 'cds'
+                                label = (f'{event.format(event1)} +'
+                                         f' {round_difference(difference, tolerance)}%')
+                            elif event2 < event1 and not only_slower:
+                                orientation = "90"
+                                shape = 'cds'
+                                label = (f'{event.format(event1)} - '
+                                         f'{round_difference(difference, tolerance)}%')
+                            else:
+                                # protection to not color by difference if we choose to show only_faster/only_slower
+                                weight_difference = 0
+                                label = event.format(function1[event])
+                        else:
+                            weight_difference = 0
+                            label = event.format(function1[event])
+                    else:
+                        if difference >= tolerance:
+                            if event2 > event1:
+                                label = (f'{event.format(event1)} +'
+                                         f' {round_difference(difference, tolerance)}%')
+                            elif event2 < event1:
+                                label = (f'{event.format(event1)} - '
+                                         f'{round_difference(difference, tolerance)}%')
+                        else:
+                            label = event.format(function1[event])
+
+                    labels.append(label)
+
+            if function1.called is not None:
+                labels.append(f"{function1.called} {MULTIPLICATION_SIGN}/ {function2.called} {MULTIPLICATION_SIGN}")
+
+            if color_by_difference and weight_difference:
+                # min and max is calculated whe color_by_difference is true
+                weight = rescale_difference(weight_difference, min_diff, max_diff)
+
+            elif function1.weight is not None and not color_by_difference:
+                weight = function1.weight
+            else:
+                weight = 0.0
+
+            label = '\n'.join(labels)
+
+            self.node(function1.id,
+                      label=label,
+                      orientation=orientation,
+                      color=self.color(theme.node_bgcolor(weight)),
+                      shape=shape,
+                      fontcolor=self.color(theme.node_fgcolor(weight)),
+                      fontsize="%f" % theme.node_fontsize(weight),
+                      tooltip=function1.filename,
+                      )
+
+            calls2 = {call.callee_id: call for _, call in sorted_iteritems(function2.calls)}
+            for _, call1 in sorted_iteritems(function1.calls):
+                call2 = calls2[call1.callee_id]
+                labels = []
+                for event in self.show_edge_events:
+                    if event in call1.events:
+                        label = f'{event.format(call1[event])} / {event.format(call2[event])}'
+                        labels.append(label)
+                weight = 0 if color_by_difference else call1.weight
+                label = '\n'.join(labels)
+                self.edge(function1.id, call1.callee_id,
+                          label=label,
+                          color=self.color(theme.edge_color(weight)),
+                          fontcolor=self.color(theme.edge_color(weight)),
+                          fontsize="%.2f" % theme.edge_fontsize(weight),
+                          penwidth="%.2f" % theme.edge_penwidth(weight),
+                          labeldistance="%.2f" % theme.edge_penwidth(weight),
+                          arrowsize="%.2f" % theme.edge_arrowsize(weight),
+                          )
+        self.end_graph()
+
     def graph(self, profile, theme):
         self.begin_graph()
 
@@ -3543,9 +3679,36 @@ def main(argv=sys.argv[1:]):
         '-p', '--path', action="append",
         type="string", dest="filter_paths",
         help="Filter all modules not in a specified path")
+    optparser.add_option(
+        '--compare',
+        action="store_true",
+        dest="compare", default=False,
+        help="Compare two graphs with identical structure. With this option two files should be provided."
+             "gprof2dot.py [options] --compare [file1] [file2] ...")
+    optparser.add_option(
+        '--compare-tolerance',
+        type="float", dest="tolerance", default=0.001,
+        help="Tolerance threshold for node difference (default=0.001%)."
+             "If the difference is below this value the nodes are considered identical.")
+    optparser.add_option(
+        '--compare-only-slower',
+        action="store_true",
+        dest="only_slower", default=False,
+        help="Display comparison only for function which are slower in second graph.")
+    optparser.add_option(
+        '--compare-only-faster',
+        action="store_true",
+        dest="only_faster", default=False,
+        help="Display comparison only for function which are faster in second graph.")
+    optparser.add_option(
+        '--compare-color-by-difference',
+        action="store_true",
+        dest="color_by_difference", default=False,
+        help="Color nodes based on the value of the difference. "
+             "Nodes with the largest differences represent the hot spots.")
     (options, args) = optparser.parse_args(argv)
 
-    if len(args) > 1 and options.format != 'pstats':
+    if len(args) > 1 and options.format != 'pstats' and not options.compare:
         optparser.error('incorrect number of arguments')
 
     try:
@@ -3567,6 +3730,11 @@ def main(argv=sys.argv[1:]):
     if Format.stdinInput:
         if not args:
             fp = sys.stdin
+        elif options.compare:
+            fp1 = open(args[0], 'rt', encoding='UTF-8')
+            fp2 = open(args[1], 'rt', encoding='UTF-8')
+            parser1 = Format(fp1)
+            parser2 = Format(fp2)
         else:
             fp = open(args[0], 'rb')
             bom = fp.read(2)
@@ -3577,17 +3745,25 @@ def main(argv=sys.argv[1:]):
                 encoding = 'utf-8'
             fp.seek(0)
             fp = io.TextIOWrapper(fp, encoding=encoding)
-        parser = Format(fp)
+            parser = Format(fp)
     elif Format.multipleInput:
         if not args:
             optparser.error('at least a file must be specified for %s input' % options.format)
-        parser = Format(*args)
+        if options.compare:
+            parser1 = Format(args[-2])
+            parser2 = Format(args[-1])
+        else:
+            parser = Format(*args)
     else:
         if len(args) != 1:
             optparser.error('exactly one file must be specified for %s input' % options.format)
         parser = Format(args[0])
 
-    profile = parser.parse()
+    if options.compare:
+        profile1 = parser1.parse()
+        profile2 = parser2.parse()
+    else:
+        profile = parser.parse()
 
     if options.output is None:
         output = open(sys.stdout.fileno(), mode='wt', encoding='UTF-8', closefd=False)
@@ -3603,7 +3779,14 @@ def main(argv=sys.argv[1:]):
     if options.show_samples:
         dot.show_function_events.append(SAMPLES)
 
-    profile.prune(options.node_thres/100.0, options.edge_thres/100.0, options.filter_paths, options.color_nodes_by_selftime)
+    if options.compare:
+        profile1.prune(options.node_thres/100.0, options.edge_thres/100.0, options.filter_paths,
+                      options.color_nodes_by_selftime)
+        profile2.prune(options.node_thres/100.0, options.edge_thres/100.0, options.filter_paths,
+                      options.color_nodes_by_selftime)
+    else:
+        profile.prune(options.node_thres/100.0, options.edge_thres/100.0, options.filter_paths,
+                      options.color_nodes_by_selftime)
 
     if options.list_functions:
         profile.printFunctionIds(selector=options.list_functions)
@@ -3622,7 +3805,10 @@ def main(argv=sys.argv[1:]):
             sys.exit(1)
         profile.prune_leaf(leafIds, options.depth)
 
-    dot.graph(profile, theme)
+    if options.compare:
+        dot.graphs_compare(profile1, profile2, theme, options)
+    else:
+        dot.graph(profile, theme)
 
 
 if __name__ == '__main__':
diff --git a/images/compare_diff.png b/images/compare_diff.png
new file mode 100644
index 0000000..bee9b88
Binary files /dev/null and b/images/compare_diff.png differ
diff --git a/tests/compare/callgrind/test/test1.callgrind b/tests/compare/callgrind/test/test1.callgrind
new file mode 100644
index 0000000..f2348f6
--- /dev/null
+++ b/tests/compare/callgrind/test/test1.callgrind
@@ -0,0 +1,2570 @@
+# callgrind format
+version: 1
+creator: callgrind-3.19.0
+pid: 527763
+cmd:  /usr/bin/date
+part: 1
+
+
+desc: I1 cache: 
+desc: D1 cache: 
+desc: LL cache: 
+
+desc: Timerange: Basic block 0 - 156688
+desc: Trigger: Program termination
+
+positions: line
+events: Ir
+summary: 610235
+
+
+ob=(5) /usr/bin/date
+fl=(5) ???
+fn=(862) 0x00000000004022f0
+0 5
+cfn=(866) 0x0000000000402280
+calls=1 0 
+0 8
+0 3
+
+fn=(814) 0x0000000000409180
+0 10
+cob=(3) /usr/lib64/libc-2.17.so
+cfi=(3) ???
+cfn=(808) __freading
+calls=2 0 
+0 16
+0 2
+0 10
+cob=(3)
+cfi=(3)
+cfn=(826) fflush
+calls=2 0 
+0 249
+cob=(1) /usr/lib64/ld-2.17.so
+cfi=(1) ???
+cfn=(224) _dl_runtime_resolve
+calls=1 0 
+0 768
+0 6
+
+fn=(358) 0x0000000000409770
+0 6
+cob=(3)
+cfi=(3)
+cfn=(230) __cxa_atexit
+calls=1 0 
+0 66
+cob=(1)
+cfi=(1)
+cfn=(224)
+calls=1 0 
+0 867
+0 5
+
+fn=(542) 0x00000000004047f0
+0 107
+cob=(3)
+cfi=(3)
+cfn=(632) fputc
+calls=7 0 
+0 273
+cob=(1)
+cfi=(1)
+cfn=(224)
+calls=1 0 
+0 778
+0 11
+0 359
+cob=(3)
+cfi=(3)
+cfn=(580) strftime
+calls=2 0 
+0 427
+cob=(1)
+cfi=(1)
+cfn=(224)
+calls=1 0 
+0 807
+0 6
+0 60
+cob=(3)
+cfi=(3)
+cfn=(604) fwrite
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+0 776
+0 6
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+cob=(3)
+cfi=(3)
+cfn=(632)
+calls=1 0 
+0 39
+0 1
+0 137
+cob=(3)
+cfi=(3)
+cfn=(730) __strlen_sse2_pminub
+calls=1 0 
+0 14
+cob=(1)
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+0 778
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+fn=(782) 0x0000000000402c50
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+
+fn=(244) 0x0000000000402310
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+
+fn=(234) 0x00000000004096f0
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+cfn=(236) 0x0000000000401620
+calls=1 0 
+0 6
+0 7
+cfn=(244)
+calls=1 0 
+0 15
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+
+fn=(410) 0x0000000000404810
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+cfn=(416) clock_gettime
+calls=1 0 
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+0 866
+0 5
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+
+fn=(784)
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+0 4186
+0 24
+
+fn=(216) 0x000000000040224a
+0 11
+cob=(3)
+cfi=(3)
+cfn=(228) (below main)
+calls=1 0 
+0 103221
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+0 934
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+fn=(262) 0x0000000000401ac0
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+fn=(204) init_cacheinfo
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+
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+fn=(328) ptmalloc_init.part.7
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+
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+
+fn=(354) strdup
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+
+fn=(372)
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+
+fn=(452) _IO_new_file_init_internal
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+0 1180
+
+fn=(858)
+0 23
+cfn=(42)
+calls=1 0 
+0 2
+0 89
+cfn=(860) _dl_sort_fini
+calls=1 0 
+0 231
+0 2
+cfn=(44)
+calls=1 0 
+0 2
+0 68
+cob=(4)
+cfi=(4)
+cfn=(874)
+calls=1 0 
+0 72
+cob=(5)
+cfi=(5)
+cfn=(862)
+calls=1 0 
+0 16
+0 18
+cob=(2)
+cfi=(2)
+cfn=(894)
+calls=1 0 
+0 3
+cob=(2)
+cfi=(2)
+cfn=(872)
+calls=1 0 
+0 3
+0 63
+
+fn=(66) mmap
+0 553
+
+fn=(96) read
+0 10
+
+fn=(104) close
+0 15
+
+fn=(110) _dl_dst_count
+0 14
+cfn=(64)
+calls=2 0 
+0 170
+0 20
+
+fn=(128) mprotect
+0 25
+
+fn=(140) init_tls
+0 11
+cfn=(28) calloc
+calls=1 0 
+0 91
+0 1
+0 37
+cfn=(142) _dl_determine_tlsoffset
+calls=1 0 
+0 56
+0 1
+cfn=(144) _dl_allocate_tls_storage
+calls=1 0 
+0 455
+0 16
+
+fn=(18) _dl_process_tunable_env_entries
+0 1577
+
+fn=(36)
+0 3088
+cfn=(66)
+calls=9 0 
+0 297
+0 1552
+
+fn=(92)
+0 5502
+cfn=(94) open
+calls=262 0 
+0 2350
+0 804
+cfn=(96)
+calls=2 0 
+0 10
+0 28
+cfn=(22)
+calls=2 0 
+0 173
+0 18
+cfn=(22)
+calls=2 0 
+0 160
+0 248
+cfn=(22)
+calls=1 0 
+0 73
+0 8
+cfn=(22)
+calls=2 0 
+0 160
+0 18
+cfn=(70)
+calls=2 0 
+0 12
+0 2
+0 2376
+cfn=(22)
+calls=1 0 
+0 88
+0 2
+
+fn=(112)
+0 28
+cfn=(88)
+calls=2 0 
+0 55969
+0 6
+
+fn=(134) _dl_check_all_versions
+0 40
+cfn=(136) _dl_check_map_versions
+calls=4 0 
+0 3493
+0 35
+
+fn=(146) _dl_relocate_object
+0 16013
+cfn=(148) _dl_lookup_symbol_x
+calls=94 0 
+0 56609
+0 3061
+cob=(3)
+cfi=(3)
+cfn=(168)
+calls=1 0 
+0 15
+cob=(3)
+cfi=(3)
+cfn=(166)
+calls=1 0 
+0 22
+cob=(3)
+cfi=(3)
+cfn=(164)
+calls=1 0 
+0 8
+cob=(3)
+cfi=(3)
+cfn=(162)
+calls=1 0 
+0 12
+cob=(3)
+cfi=(3)
+cfn=(160)
+calls=1 0 
+0 5
+cob=(3)
+cfi=(3)
+cfn=(156)
+calls=1 0 
+0 22
+cob=(3)
+cfi=(3)
+cfn=(154)
+calls=1 0 
+0 12
+0 319
+cfn=(128)
+calls=4 0 
+0 20
+0 307
+cfn=(148)
+calls=6 0 
+0 3132
+0 281
+
+fn=(64)
+0 24998
+
+fn=(122) _dl_cache_libcmp
+0 665
+
+fn=(38) memcpy
+0 9096
+
+fn=(48) _dl_discover_osversion
+0 21
+cfn=(50) uname
+calls=1 0 
+0 5
+0 59
+
+fn=(62)
+0 792
+cfn=(64)
+calls=66 0 
+0 24716
+0 330
+cfn=(12)
+calls=66 0 
+0 13733
+0 198
+cfn=(32)
+calls=66 0 
+0 2436
+0 66
+0 858
+cfn=(38)
+calls=66 0 
+0 7410
+
+fn=(102) memset
+0 2122
+
+fn=(136)
+0 164
+cfn=(90)
+calls=7 0 
+0 510
+0 162
+cfn=(138) match_symbol
+calls=6 0 
+0 1152
+0 6
+cfn=(138)
+calls=2 0 
+0 302
+0 344
+cfn=(28)
+calls=3 0 
+0 129
+0 3
+0 721
+
+fn=(4) _dl_setup_hash
+0 92
+
+fn=(12)
+0 37799
+
+fn=(52) _dl_init_paths
+0 14
+cfn=(54) _dl_important_hwcaps
+calls=1 0 
+0 346
+0 3
+cfn=(32)
+calls=1 0 
+0 34
+0 1
+0 15
+cfn=(32)
+calls=1 0 
+0 34
+0 1
+0 84
+cfn=(12)
+calls=1 0 
+0 10951
+0 28
+cfn=(38)
+calls=1 0 
+0 1243
+0 77641
+cfn=(32)
+calls=1 0 
+0 34
+0 1
+0 10
+cfn=(58)
+calls=1 0 
+0 257804
+0 16
+
+fn=(56)
+0 23243
+
+fn=(108) _dl_map_object_deps
+0 265
+cfn=(110)
+calls=2 0 
+0 204
+0 20
+cfn=(80)
+calls=2 0 
+0 56119
+0 235
+cfn=(32)
+calls=2 0 
+0 68
+0 2
+0 20
+cfn=(38)
+calls=2 0 
+0 41
+0 10
+cfn=(38)
+calls=2 0 
+0 41
+0 73
+cfn=(32)
+calls=1 0 
+0 34
+0 1
+0 88
+cfn=(102)
+calls=1 0 
+0 14
+0 107
+cfn=(102)
+calls=2 0 
+0 18
+0 320
+cfn=(38)
+calls=1 0 
+0 28
+0 7
+
+fn=(84)
+0 60
+
+fn=(94)
+0 2355
+
+fn=(172) _dl_allocate_tls_init
+0 61
+cfn=(56)
+calls=1 0 
+0 23
+0 4
+cfn=(102)
+calls=1 0 
+0 150
+0 16
+
+fn=(176) _dl_unload_cache
+0 7
+cfn=(178) munmap
+calls=1 0 
+0 5
+0 3
+
+fn=(24) _dl_new_object
+0 45
+cfn=(12)
+calls=3 0 
+0 325
+0 57
+cfn=(28)
+calls=3 0 
+0 182
+0 3
+0 36
+cfn=(38)
+calls=3 0 
+0 150
+0 201
+cfn=(12)
+calls=2 0 
+0 282
+0 64
+cfn=(56)
+calls=2 0 
+0 133
+0 180
+cfn=(32)
+calls=2 0 
+0 68
+0 2
+0 10
+
+fn=(74) _dl_count_modids
+0 4
+
+fn=(132)
+0 6
+cfn=(134)
+calls=1 0 
+0 3568
+0 4
+
+fn=(144)
+0 7
+cfn=(36)
+calls=1 0 
+0 78
+0 1
+0 315
+cfn=(28)
+calls=1 0 
+0 43
+0 1
+0 10
+
+fn=(150) do_lookup_x
+0 20311
+cfn=(90)
+calls=72 0 
+0 2994
+0 8356
+cfn=(152)
+calls=115 0 
+0 19154
+0 575
+
+fn=(70)
+0 402
+
+fn=(98)
+0 36
+cfn=(72)
+calls=2 0 
+0 16
+0 10
+cfn=(100) _fxstat
+calls=2 0 
+0 20
+0 113
+cfn=(24)
+calls=2 0 
+0 1494
+0 721
+cfn=(126) _dl_next_tls_modid
+calls=1 0 
+0 6
+0 68
+cfn=(66)
+calls=2 0 
+0 68
+0 128
+cfn=(102)
+calls=2 0 
+0 1908
+0 98
+cfn=(66)
+calls=4 0 
+0 124
+0 570
+cfn=(104)
+calls=1 0 
+0 5
+0 2
+cfn=(104)
+calls=1 0 
+0 5
+0 30
+cfn=(4)
+calls=2 0 
+0 46
+0 35
+cfn=(40) _dl_add_to_namespace_list
+calls=2 0 
+0 84
+0 20
+cfn=(128)
+calls=1 0 
+0 5
+0 47
+cfn=(66)
+calls=1 0 
+0 31
+0 6
+
+fn=(860)
+0 39
+cfn=(102)
+calls=1 0 
+0 14
+0 29
+cfn=(102)
+calls=2 0 
+0 18
+0 131
+
+fn=(2) _dl_start
+0 605
+cfn=(4)
+calls=1 0 
+0 23
+0 17
+cfn=(6)
+calls=1 0 
+0 503071
+0 64
+
+fn=(44)
+0 10
+
+fn=(78) handle_ld_preload
+0 2417
+cfn=(80)
+calls=1 0 
+0 3965
+0 22
+cfn=(38)
+calls=1 0 
+0 129
+0 4
+
+fn=(224)
+0 500
+cfn=(226) _dl_fixup
+calls=20 0 
+0 15629
+0 300
+
+fn=(14)
+0 17
+
+fn=(22)
+0 14325
+
+fn=(50)
+0 5
+
+fn=(54)
+0 96
+cfn=(32)
+calls=1 0 
+0 34
+0 1
+0 162
+cfn=(56)
+calls=1 0 
+0 22
+0 5
+cfn=(56)
+calls=1 0 
+0 22
+0 4
+
+fn=(226)
+0 940
+cfn=(148)
+calls=20 0 
+0 14232
+0 442
+cob=(3)
+cfi=(3)
+cfn=(728)
+calls=1 0 
+0 7
+cob=(3)
+cfi=(3)
+cfn=(272)
+calls=1 0 
+0 6
+0 2
+
+fn=(16)
+0 35
+cfn=(18)
+calls=1 0 
+0 1577
+0 7
+cfn=(20) _dl_next_ld_env_entry
+calls=1 0 
+0 188
+0 4
+cfn=(20)
+calls=2 0 
+0 1347
+0 170
+cfn=(24)
+calls=1 0 
+0 244
+0 10
+cfn=(40)
+calls=1 0 
+0 34
+0 138
+cfn=(46)
+calls=1 0 
+0 7
+0 227
+cfn=(4)
+calls=1 0 
+0 23
+0 5
+cfn=(48)
+calls=1 0 
+0 85
+0 78
+cfn=(22)
+calls=1 0 
+0 120
+0 9
+cfn=(22)
+calls=1 0 
+0 26
+0 14
+cfn=(22)
+calls=1 0 
+0 80
+0 7
+cfn=(52)
+calls=1 0 
+0 348260
+0 3
+cfn=(72)
+calls=1 0 
+0 17
+0 57
+cfn=(74)
+calls=1 0 
+0 4
+0 19
+cfn=(106)
+calls=1 0 
+0 9
+0 19
+cfn=(108)
+calls=1 0 
+0 57715
+0 102
+cfn=(130)
+calls=1 0 
+0 3608
+0 5
+cfn=(140)
+calls=1 0 
+0 668
+0 35
+cfn=(172)
+calls=1 0 
+0 254
+0 5
+cfn=(174) _dl_sysdep_start_cleanup
+calls=1 0 
+0 1
+0 6
+cfn=(72)
+calls=1 0 
+0 8
+0 3
+cfn=(76) _dl_debug_state
+calls=1 0 
+0 1
+0 2
+cfn=(176)
+calls=1 0 
+0 15
+0 18
+cfn=(78)
+calls=1 0 
+0 6537
+0 11
+cfn=(76)
+calls=1 0 
+0 1
+0 14
+cfn=(146)
+calls=1 0 
+0 6275
+0 96
+cfn=(146)
+calls=3 0 
+0 73563
+0 54
+cfn=(170) _dl_add_to_slotinfo
+calls=1 0 
+0 24
+0 1
+
+fn=(100)
+0 30
+
+fn=(126)
+0 6
+
+fn=(174)
+0 1
+
+fn=(0) 0x0000000000001140
+0 2
+cfn=(2)
+calls=1 0 
+0 503780
+0 14
+cfn=(182)
+calls=1 0 
+0 2265
+0 3
+cob=(5)
+cfi=(5)
+cfn=(216)
+calls=1 0 
+0 104171
+
+fn=(42)
+0 10
+
+fn=(90)
+0 602
+cfn=(46)
+calls=86 0 
+0 609
+0 1047
+cfn=(46)
+calls=90 0 
+0 1042
+0 696
+
+fn=(114)
+0 505
+cfn=(56)
+calls=65 0 
+0 5769
+0 3770
+cfn=(56)
+calls=260 0 
+0 5525
+0 1040
+cfn=(56)
+calls=260 0 
+0 5980
+0 3120
+cfn=(92)
+calls=260 0 
+0 10920
+0 5729
+cfn=(116) _xstat
+calls=260 0 
+0 3185
+0 3968
+
+fn=(124) strdup
+0 5
+cfn=(12)
+calls=1 0 
+0 34
+0 3
+cfn=(32)
+calls=1 0 
+0 34
+0 1
+0 9
+cfn=(38)
+calls=1 0 
+0 27
+
+fn=(138)
+0 728
+cfn=(46)
+calls=8 0 
+0 646
+0 80
+
+fn=(178)
+0 5
+
+fn=(28)
+0 64
+cfn=(32)
+calls=8 0 
+0 373
+0 8
+
+fn=(40)
+0 21
+cfn=(42)
+calls=3 0 
+0 6
+0 70
+cfn=(44)
+calls=2 0 
+0 4
+0 13
+cfn=(44)
+calls=1 0 
+0 2
+0 2
+
+fn=(118)
+0 155
+cfn=(122)
+calls=8 0 
+0 593
+0 39
+cfn=(120) _dl_sysdep_read_whole_file
+calls=1 0 
+0 94
+0 10
+cfn=(22)
+calls=1 0 
+0 112
+0 15
+cfn=(22)
+calls=1 0 
+0 165
+0 18
+cfn=(122)
+calls=1 0 
+0 72
+0 42
+cfn=(12)
+calls=1 0 
+0 69
+0 21
+cfn=(38)
+calls=1 0 
+0 27
+0 2
+cfn=(124)
+calls=1 0 
+0 113
+0 8
+
+fn=(46)
+0 1727
+cfn=(47) strcmp'2
+calls=176 0 
+0 12993
+0 660
+
+fn=(47)
+0 12619
+cfn=(47)
+calls=1633 0 
+0 70620
+0 374
+
+fn=(76)
+0 2
+
+fn=(82)
+0 8
+
+fn=(116)
+0 3185
+
+fn=(120)
+0 11
+cfn=(94)
+calls=1 0 
+0 5
+0 7
+cfn=(100)
+calls=1 0 
+0 10
+0 8
+cfn=(104)
+calls=1 0 
+0 5
+0 13
+cfn=(66)
+calls=1 0 
+0 33
+0 2
+
+fn=(142)
+0 56
+
+fn=(20)
+0 1535
+
+fn=(86)
+0 9
+cfn=(88)
+calls=1 0 
+0 3895
+0 3
+
+fn=(148)
+0 18296
+cfn=(150)
+calls=120 0 
+0 51390
+0 4287
+
+fn=(170)
+0 24
+
+totals: 610235
diff --git a/tests/compare/callgrind/test/test2.callgrind b/tests/compare/callgrind/test/test2.callgrind
new file mode 100644
index 0000000..085c692
--- /dev/null
+++ b/tests/compare/callgrind/test/test2.callgrind
@@ -0,0 +1,2570 @@
+# callgrind format
+version: 1
+creator: callgrind-3.19.0
+pid: 526975
+cmd:  /usr/bin/date
+part: 1
+
+
+desc: I1 cache: 
+desc: D1 cache: 
+desc: LL cache: 
+
+desc: Timerange: Basic block 0 - 156738
+desc: Trigger: Program termination
+
+positions: line
+events: Ir
+summary: 610544
+
+
+ob=(1) /usr/lib64/ld-2.17.so
+fl=(1) ???
+fn=(16) dl_main
+0 35
+cfn=(18) _dl_process_tunable_env_entries
+calls=1 0 
+0 1577
+0 7
+cfn=(20) _dl_next_ld_env_entry
+calls=1 0 
+0 188
+0 4
+cfn=(20)
+calls=2 0 
+0 1347
+0 170
+cfn=(24) _dl_new_object
+calls=1 0 
+0 244
+0 10
+cfn=(40) _dl_add_to_namespace_list
+calls=1 0 
+0 34
+0 138
+cfn=(46) strcmp
+calls=1 0 
+0 7
+0 227
+cfn=(4) _dl_setup_hash
+calls=1 0 
+0 23
+0 5
+cfn=(48) _dl_discover_osversion
+calls=1 0 
+0 85
+0 78
+cfn=(22) bcmp
+calls=1 0 
+0 120
+0 9
+cfn=(22)
+calls=1 0 
+0 26
+0 14
+cfn=(22)
+calls=1 0 
+0 80
+0 7
+cfn=(52) _dl_init_paths
+calls=1 0 
+0 348260
+0 3
+cfn=(72) _dl_debug_initialize
+calls=1 0 
+0 17
+0 57
+cfn=(74) _dl_count_modids
+calls=1 0 
+0 4
+0 19
+cfn=(106) access
+calls=1 0 
+0 9
+0 19
+cfn=(108) _dl_map_object_deps
+calls=1 0 
+0 57715
+0 102
+cfn=(130) _dl_receive_error
+calls=1 0 
+0 3608
+0 5
+cfn=(140) init_tls
+calls=1 0 
+0 668
+0 35
+cfn=(172) _dl_allocate_tls_init
+calls=1 0 
+0 254
+0 5
+cfn=(174) _dl_sysdep_start_cleanup
+calls=1 0 
+0 1
+0 6
+cfn=(72)
+calls=1 0 
+0 8
+0 3
+cfn=(76) _dl_debug_state
+calls=1 0 
+0 1
+0 2
+cfn=(176) _dl_unload_cache
+calls=1 0 
+0 15
+0 18
+cfn=(78) handle_ld_preload
+calls=1 0 
+0 6537
+0 11
+cfn=(76)
+calls=1 0 
+0 1
+0 14
+cfn=(146) _dl_relocate_object
+calls=1 0 
+0 6275
+0 96
+cfn=(146)
+calls=3 0 
+0 73563
+0 54
+cfn=(170) _dl_add_to_slotinfo
+calls=1 0 
+0 24
+0 1
+
+fn=(102) memset
+0 2122
+
+fn=(136) _dl_check_map_versions
+0 164
+cfn=(90) _dl_name_match_p
+calls=7 0 
+0 510
+0 162
+cfn=(138) match_symbol
+calls=6 0 
+0 1152
+0 6
+cfn=(138)
+calls=2 0 
+0 302
+0 344
+cfn=(28) calloc
+calls=3 0 
+0 129
+0 3
+0 721
+
+fn=(74)
+0 4
+
+fn=(132) version_check_doit
+0 6
+cfn=(134) _dl_check_all_versions
+calls=1 0 
+0 3568
+0 4
+
+fn=(144) _dl_allocate_tls_storage
+0 7
+cfn=(36) __libc_memalign
+calls=1 0 
+0 78
+0 1
+0 315
+cfn=(28)
+calls=1 0 
+0 43
+0 1
+0 10
+
+fn=(150) do_lookup_x
+0 20311
+cfn=(90)
+calls=72 0 
+0 2994
+0 8356
+cfn=(152) check_match.9525
+calls=115 0 
+0 19154
+0 575
+
+fn=(8) brk
+0 12
+
+fn=(50) uname
+0 5
+
+fn=(54) _dl_important_hwcaps
+0 96
+cfn=(32) malloc
+calls=1 0 
+0 34
+0 1
+0 162
+cfn=(56) mempcpy
+calls=1 0 
+0 22
+0 5
+cfn=(56)
+calls=1 0 
+0 22
+0 4
+
+fn=(84) __sigsetjmp
+0 60
+
+fn=(94) open
+0 2355
+
+fn=(172)
+0 61
+cfn=(56)
+calls=1 0 
+0 23
+0 4
+cfn=(102)
+calls=1 0 
+0 150
+0 16
+
+fn=(176)
+0 7
+cfn=(178) munmap
+calls=1 0 
+0 5
+0 3
+
+fn=(18)
+0 1577
+
+fn=(78)
+0 2417
+cfn=(80) _dl_catch_error
+calls=1 0 
+0 3965
+0 22
+cfn=(38) memcpy
+calls=1 0 
+0 129
+0 4
+
+fn=(6) _dl_sysdep_start
+0 988
+cfn=(8)
+calls=1 0 
+0 12
+0 6
+cfn=(10) init_cpu_features.constprop.0
+calls=1 0 
+0 122
+0 4
+cfn=(12) strlen
+calls=1 0 
+0 41
+0 3
+cfn=(14) sbrk
+calls=1 0 
+0 17
+0 12
+cfn=(16)
+calls=1 0 
+0 501845
+0 27
+
+fn=(10)
+0 122
+
+fn=(20)
+0 1535
+
+fn=(42) rtld_lock_default_lock_recursive
+0 10
+
+fn=(98) _dl_map_object_from_fd
+0 36
+cfn=(72)
+calls=2 0 
+0 16
+0 10
+cfn=(100) _fxstat
+calls=2 0 
+0 20
+0 113
+cfn=(24)
+calls=2 0 
+0 1494
+0 721
+cfn=(126) _dl_next_tls_modid
+calls=1 0 
+0 6
+0 68
+cfn=(66) mmap
+calls=2 0 
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+
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+
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+
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+
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+
+ob=(2)
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+
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+
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+
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+
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+
+totals: 610544
diff --git a/tests/compare/pstats/print/print1.pstats b/tests/compare/pstats/print/print1.pstats
new file mode 100644
index 0000000..3ff408b
Binary files /dev/null and b/tests/compare/pstats/print/print1.pstats differ
diff --git a/tests/compare/pstats/print/print2.pstats b/tests/compare/pstats/print/print2.pstats
new file mode 100644
index 0000000..47da9ef
Binary files /dev/null and b/tests/compare/pstats/print/print2.pstats differ
diff --git a/tests/test.py b/tests/test.py
index 28e51c3..a395306 100755
--- a/tests/test.py
+++ b/tests/test.py
@@ -44,6 +44,10 @@
     "xperf",
     "dtrace",
 ]
+formats_compare = [
+    "callgrind",
+    "pstats"
+]
 
 
 NB_RUN_FAILURES = 0
@@ -91,7 +95,7 @@ def diff(a, b):
     b_lines = open(b, 'rt', encoding='UTF-8').readlines()
     diff_lines = difflib.unified_diff(a_lines, b_lines, fromfile=a, tofile=b)
 
-    diff_txt= ''.join(diff_lines)
+    diff_txt = ''.join(diff_lines)
     if len(diff_txt) > 0:
         NB_DIFF_FAILURES += 1
         sys.stdout.write("Non empty diff for files %s and %s" %(a,b))
@@ -167,10 +171,41 @@ def main():
                 else:
                     diff(ref_dot, dot)
 
+    for format_compare in formats_compare:
+        subdir = os.path.join(test_dir, 'compare', format_compare)
+        for dirname in os.listdir(subdir):
+            test_subdir = os.path.join(subdir, dirname)
+            name1 = dirname + '1.'
+            name2 = dirname + '2.'
+            filename1 = name1 + format_compare
+            filename2 = name2 + format_compare
+
+            sys.stdout.write(filename1 + '\n')
+
+            profile1 = os.path.join(test_subdir, filename1)
+            profile2 = os.path.join(test_subdir, filename2)
+            dot = os.path.join(test_subdir, name1 + '.dot')
+            png = os.path.join(test_subdir, name1 + '.png')
+
+            ref_dot = os.path.join(test_subdir, name1 + '.orig.dot')
+            ref_png = os.path.join(test_subdir, name1 + '.orig.png')
+
+            if run_gprof2dot(['-f', format_compare, '-o', dot, '--compare', profile1, profile2]) != 0:
+                continue
+
+            if run(['dot', '-Tpng', '-o', png, dot]) != 0:
+                continue
+
+            if options.force or not os.path.exists(ref_dot):
+                shutil.copy(dot, ref_dot)
+                shutil.copy(png, ref_png)
+            else:
+                diff(ref_dot, dot)
+
     # test the --list-functions flag only for pstats format
     profile = os.path.join(test_dir, 'pstats', 'memtrail.pstats')
     genfileNm = os.path.join(test_dir, 'pstats', 'function-list.testgen.txt')
-    outfile =  open(genfileNm, "w")
+    outfile = open(genfileNm, "w")
     for flagVal in ("+", "execfile", "*execfile", "*:execfile", "*parse", "*parse_*"):
         run_gprof2dot(['-f', "pstats", "--list-functions="+flagVal, profile], stderr=outfile)
 
@@ -187,7 +222,7 @@ def main():
     if NB_RUN_FAILURES or NB_DIFF_FAILURES:
         print("Nb runs ending in error: %d" % NB_RUN_FAILURES)
         print("Nb diffs showing a difference: %d" % NB_DIFF_FAILURES)
-        if ( options.max_acceptable is not None
+        if (options.max_acceptable is not None
              and NB_RUN_FAILURES + NB_DIFF_FAILURES > options.max_acceptable ):
             print("Too many errors: returning non-zero code")
             sys.exit(1)