diff --git a/test/speed_runner.py b/test/speed_runner.py
index 8e6bfa404..a8951fc66 100644
--- a/test/speed_runner.py
+++ b/test/speed_runner.py
@@ -8,18 +8,17 @@ def main():
   parser.add_argument('-ex', '--executable', required=True)
   args = parser.parse_args()
 
-  ndata = [10^4, 10^5, 10^6, 10^7, 10^8]
-  nrepeat = [10^2, 10^3, 10^4, 10^5]
+  ndata = [10**4, 10**5, 10**6, 10**7]
+  nrepeat = [10**4, 10**3, 10**2, 10]
 
   machines = [2,4,8,16,31]
 
-  for data in ndata:
-    for repeat in nrepeat:
-      for machine in machines:
-        host_file = os.path.join(args.host_dir, 'hosts%d' % machine)
-        cmd = 'python %s %d %s %s %d %d' % (args.submit_script, machine, host_file, args.executable, data, repeat)
-        print 'data=%d, repeat=%d, machine=%d' % (data, repeat, machine)
-        os.system(cmd)
+  for i, data in enumerate(ndata):
+    for machine in machines:
+      host_file = os.path.join(args.host_dir, 'hosts%d' % machine)
+      cmd = 'python %s %d %s %s %d %d' % (args.submit_script, machine, host_file, args.executable, data, nrepeat[i])
+      print 'data=%d, repeat=%d, machine=%d' % (data, nrepeat[i], machine)
+      os.system(cmd)
 
 if __name__ == "__main__":
   main()
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