Move basic perf-test output from perftest.log to perftest.sum.

This patch does two things.
1) Add support for multiple data points.
2) Move the "report" output from perftest.log to perftest.sum.

I want to record the raw data somewhere, and a bit of statistical analysis
(standard deviation left for another day), but I also don't want
it to clutter up the basic report.
This patch takes a cue from gdb.{sum,log} and does the same thing
with perftest.{sum,log}.
Ultimately, we'll probably want to emit raw data to csv files or some
such and then do post-processing passes on that.

gdb/testsuite/ChangeLog:

	* lib/perftest/reporter.py (SUM_FILE_NAME): New global.
	(LOG_FILE_NAME): New global.
	(TextReporter.__init__): Initialize self.txt_sum.
	(TextReporter.report): Add support for multiple data-points.
	Move report to perftest.sum, put raw data in perftest.log.
	(TextReporter.start): Open sum and log files.
	(TextReporter.end): Close sum and log files.
	* lib/perftest/testresult.py (SingleStatisticTestResult.record): Handle
	multiple data-points.

3 files changed, 44 insertions, 8 deletions

diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
index e11260c..3e1ad7b 100644
--- a/gdb/testsuite/ChangeLog
+++ b/gdb/testsuite/ChangeLog
@@ -1,3 +1,15 @@
+2015-08-03  Doug Evans  <dje@google.com>
+
+	* lib/perftest/reporter.py (SUM_FILE_NAME): New global.
+	(LOG_FILE_NAME): New global.
+	(TextReporter.__init__): Initialize self.txt_sum.
+	(TextReporter.report): Add support for multiple data-points.
+	Move report to perftest.sum, put raw data in perftest.log.
+	(TextReporter.start): Open sum and log files.
+	(TextReporter.end): Close sum and log files.
+	* lib/perftest/testresult.py (SingleStatisticTestResult.record): Handle
+	multiple data-points.
+
 2015-07-31  Pedro Alves  <palves@redhat.com>
 
 	* gdb.base/attach-pie-misread.exp: Rename $res to $test_spawn_id.
diff --git a/gdb/testsuite/gdb.perf/lib/perftest/reporter.py b/gdb/testsuite/gdb.perf/lib/perftest/reporter.py
index 1f9358c..646051e 100644
--- a/gdb/testsuite/gdb.perf/lib/perftest/reporter.py
+++ b/gdb/testsuite/gdb.perf/lib/perftest/reporter.py
@@ -13,6 +13,15 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+# Text reports are written here.
+# This is the perftest counterpart to gdb.sum.
+SUM_FILE_NAME = "perftest.sum"
+
+# Raw data that went into the report is written here.
+# This is the perftest counterpart to gdb.log.
+LOG_FILE_NAME = "perftest.log"
+
+
 class Reporter(object):
     """Base class of reporter to report test results in a certain format.
 
@@ -43,22 +52,34 @@ class Reporter(object):
         """
         raise NotImplementedError("Abstract Method:end.")
 
+
 class TextReporter(Reporter):
     """Report results in a plain text file 'perftest.log'."""
 
     def __init__(self, append):
         super (TextReporter, self).__init__(Reporter(append))
+        self.txt_sum = None
         self.txt_log = None
 
-    def report(self, *args):
-        self.txt_log.write(' '.join(str(arg) for arg in args))
-        self.txt_log.write('\n')
+    def report(self, test_name, measurement_name, data_points):
+        if len(data_points) == 0:
+            self.txt_sum.write("%s %s *no data recorded*\n" % (
+                test_name, measurement_name))
+            return
+        average = sum(data_points) / len(data_points)
+        data_min = min(data_points)
+        data_max = max(data_points)
+        self.txt_sum.write("%s %s %s\n" % (
+            test_name, measurement_name, average))
+        self.txt_log.write("%s %s %s, min %s, max %s, data %s\n" % (
+            test_name, measurement_name, average, data_min, data_max,
+            data_points))
 
     def start(self):
-        if self.append:
-            self.txt_log = open ("perftest.log", 'a+');
-        else:
-            self.txt_log = open ("perftest.log", 'w');
+        mode = "a+" if self.append else "w"
+        self.txt_sum = open (SUM_FILE_NAME, mode);
+        self.txt_log = open (LOG_FILE_NAME, mode);
 
     def end(self):
+        self.txt_sum.close ()
         self.txt_log.close ()
diff --git a/gdb/testsuite/gdb.perf/lib/perftest/testresult.py b/gdb/testsuite/gdb.perf/lib/perftest/testresult.py
index cf39808..c799d38 100644
--- a/gdb/testsuite/gdb.perf/lib/perftest/testresult.py
+++ b/gdb/testsuite/gdb.perf/lib/perftest/testresult.py
@@ -35,7 +35,10 @@ class SingleStatisticTestResult(TestResult):
         self.results = dict ()
 
     def record(self, parameter, result):
-        self.results[parameter] = result
+        if parameter in self.results:
+            self.results[parameter].append(result)
+        else:
+            self.results[parameter] = [result]
 
     def report(self, reporter, name):
         reporter.start()