--- /dev/null
+#!/usr/bin/env python
+
+import os
+import sys
+import argparse
+import subprocess
+
+parser = argparse.ArgumentParser()
+
+parser.add_argument('--start', type=int, default=0)
+parser.add_argument('--end', type=int, default=(1 << 32))
+parser.add_argument('command', nargs='+')
+
+args = parser.parse_args()
+
+start = args.start
+end = args.end
+
+print("Bisect Starting!")
+print("Start: %d" % start)
+print("End: %d" % end)
+
+last = None
+while start != end and start != end-1:
+ count = start + (end - start)/2
+ print("Visiting Count: %d with (Start, End) = (%d,%d)" % (count, start, end))
+ cmd = [x % {'count':count} for x in args.command]
+ print cmd
+ result = subprocess.call(cmd)
+ if result == 0:
+ print(" PASSES! Setting start to count")
+ start = count
+ else:
+ print(" FAILS! Setting end to count")
+ end = count
+
+print("Last good count: %d" % start)