1 files changed, 79 insertions, 0 deletions
diff --git a/tools/parallel_run.py b/tools/parallel_run.py
new file mode 100755
index 0000000000..0fc9ebd28f
--- /dev/null
+++ b/tools/parallel_run.py
@@ -0,0 +1,79 @@
+#!/usr/bin/python3
+#
+# Copyright 2019, The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""
+Run a command using multiple cores in parallel. Stop when one exits zero and save the log from
+that run.
+"""
+
+import argparse
+import concurrent.futures
+import contextlib
+import itertools
+import os
+import os.path
+import shutil
+import subprocess
+import tempfile
+
+
+def run_one(cmd, tmpfile):
+  """Run the command and log result to tmpfile. Return both the file name and returncode."""
+  with open(tmpfile, "x") as fd:
+    return tmpfile, subprocess.run(cmd, stdout=fd).returncode
+
+def main():
+  parser = argparse.ArgumentParser(
+      description="""Run a command using multiple cores and save non-zero exit log
+
+      The cmd should print all output to stdout. Stderr is not captured."""
+  )
+  parser.add_argument("--jobs", "-j", type=int, help="max number of jobs. default 60", default=60)
+  parser.add_argument("cmd", help="command to run")
+  parser.add_argument("--out", type=str, help="where to put result", default="out_log")
+  args = parser.parse_args()
+  cnt = 0
+  found_fail = False
+  ids = itertools.count(0)
+  with tempfile.TemporaryDirectory() as td:
+    print("Temporary files in {}".format(td))
+    with concurrent.futures.ProcessPoolExecutor(args.jobs) as p:
+      fs = set()
+      while len(fs) != 0 or not found_fail:
+        if not found_fail:
+          for _, idx in zip(range(args.jobs - len(fs)), ids):
+            fs.add(p.submit(run_one, args.cmd, os.path.join(td, "run_log." + str(idx))))
+        ws = concurrent.futures.wait(fs, return_when=concurrent.futures.FIRST_COMPLETED)
+        fs = ws.not_done
+        done = list(map(lambda a: a.result(), ws.done))
+        cnt += len(done)
+        print("\r{} runs".format(cnt), end="")
+        failed = [d for d,r in done if r != 0]
+        succ = [d for d,r in done if r == 0]
+        for f in succ:
+          os.remove(f)
+        if len(failed) != 0:
+          if not found_fail:
+            found_fail = True
+            print("\rFailed at {} runs".format(cnt))
+            if len(failed) != 1:
+              for f,i in zip(failed, range(len(failed))):
+                shutil.copyfile(f, args.out+"."+str(i))
+            else:
+              shutil.copyfile(failed[0], args.out)
+
+if __name__ == '__main__':
+  main()