ocl: improved tuning script

* Backup dotfile if it exists stemming from an earlier session.
* Adjusted default DB-location for OpenTuner.

src/acc/opencl/smm/tune_multiply.py

@@ -13,6 +13,9 @@
 from opentuner import MeasurementInterface
 from opentuner import Result
 from signal import signal, SIGINT
+import tempfile
+import socket
+import shutil
 import copy
 import json
 import glob
@@ -43,6 +46,7 @@ def ilog2(n):
 class SmmTuner(MeasurementInterface):
     def manipulator(self):
         """Setup common state and define search space"""
+        dbdir = os.path.join(tempfile.gettempdir(), "opentuner.db")
         manipulator = ConfigurationManipulator()
         # parse and sanitize kernel shape argument
         if not self.args.mnk:
@@ -167,8 +171,15 @@ def manipulator(self):
             and (self.device and "" != self.device)
             and (self.size and 0 < self.size)
             and self.typeid
-        ):  # construct label used for the database session
-            if not self.args.label:  # consider to include self.device
+        ):  # setup database (DB)
+            if args.database is None:  # adjust DB-location
+                if os.path.isdir(dbdir):
+                    shutil.rmtree(dbdir)
+                os.mkdir(dbdir)
+                self.args.database = "sqlite:///" + os.path.join(
+                    dbdir, socket.gethostname() + ".db"
+                )
+            if not self.args.label:  # label for DB-session
                 self.args.label = "{}-{}-{}x{}x{}-s{}".format(
                     default_basename,
                     self.typename,
@@ -450,7 +461,21 @@ def save_final_config(self, configuration, final=True):
         )
         filedot = os.path.join(self.args.jsondir, ".{}.json".format(self.args.label))
         if self.gfsave < self.gflops:  # save intermediate result
-            self.gfsave = self.gflops
+            if 0 == self.gfsave and os.path.exists(filedot):  # backup
+                data = None
+                try:
+                    with open(filedot, "r") as file:
+                        data = json.load(file)
+                except:  # noqa: E722
+                    pass
+                gflops = data["GFLOPS"] if data and "GFLOPS" in data else 0
+                filename = os.path.join(
+                    self.args.jsondir,
+                    "{}-{}gflops.json".format(self.args.label, round(gflops))
+                    if 0 < gflops
+                    else "{}.json".format(self.args.label),
+                )
+                os.rename(filedot, filename)
             # self.manipulator().save_to_file(config, filename)
             with open(filedot, "w") as file:
                 cfg = config
@@ -459,6 +484,7 @@ def save_final_config(self, configuration, final=True):
                     del cfg["XF"]
                 json.dump(cfg, file, sort_keys=True)
                 file.write("\n")  # append newline at EOF
+            self.gfsave = self.gflops
         # check return code (consider not saving parameters)
         if 0 != result and not final:  # incorrect result
             failed = " ".join(map(str, cfgenv)).replace("OPENCL_LIBSMM_SMM_", "")
@@ -474,7 +500,7 @@ def save_final_config(self, configuration, final=True):
             filename = os.path.normpath(
                 os.path.join(
                     self.args.jsondir,
-                    "{}-{}gflops.json".format(self.args.label, round(self.gfsave)),
+                    "{}-{}gflops.json".format(self.args.label, round(self.gflops)),
                 )
             )
             if os.path.exists(filedot):
@@ -483,7 +509,7 @@ def save_final_config(self, configuration, final=True):
                     filenames.append(filename)
                     self.merge_jsons(filenames)
                 speedup = round(
-                    (self.gfsave / self.gfbase) if 0 < self.gfbase else 0, 1
+                    (self.gflops / self.gfbase) if 0 < self.gfbase else 0, 1
                 )
                 print(
                     "Result{} was written to {}".format(
@@ -780,6 +806,6 @@ def handle_sigint(self, signum, frame):
     try:
         SmmTuner.main(args)
     except Exception as e:
-        print("ERROR {}: {}!".format(type(e).__name__, e))
+        print("{}: {}".format(type(e).__name__, e))
         print("WARNING: ignored above error!")
         pass