Add an option to cmsDriver for selecting the accelerators to use

Configuration/Applications/python/ConfigBuilder.py

@@ -89,6 +89,7 @@ class Options:
 defaultOptions.nStreams = '0'
 defaultOptions.nConcurrentLumis = '0'
 defaultOptions.nConcurrentIOVs = '1'
+defaultOptions.accelerators = None
 
 # some helper routines
 def dumpPython(process,name):
@@ -2280,6 +2281,16 @@ def prepare(self, doChecking = False):
             self.process.options.numberOfStreams = int(self._options.nStreams)
             self.process.options.numberOfConcurrentLuminosityBlocks = int(self._options.nConcurrentLumis)
             self.process.options.eventSetup.numberOfConcurrentIOVs = int(self._options.nConcurrentIOVs)
+
+        if self._options.accelerators is not None:
+            accelerators = self._options.accelerators.split(',')
+            self.pythonCfgCode += "\n"
+            self.pythonCfgCode += "# Enable only these accelerator backends\n"
+            self.pythonCfgCode += "process.load('Configuration.StandardSequences.Accelerators_cff')\n"
+            self.pythonCfgCode += "process.options.accelerators = ['" + "', '".join(accelerators) + "']\n"
+            self.process.load('Configuration.StandardSequences.Accelerators_cff')
+            self.process.options.accelerators = accelerators
+
         #repacked version
         if self._options.isRepacked:
             self.pythonCfgCode +="\n"

Configuration/Applications/python/Options.py

@@ -414,3 +414,8 @@
                           default=defaultOptions.nConcurrentIOVs,
                           dest='nConcurrentIOVs'
                           )
+expertSettings.add_option("--accelerators",
+                          help="Comma-separated list of accelerators to enable; if 'cpu' is not included, the job will fail if none of the accelerators is available (default is not set, enabling all available accelerators, including the cpu)",
+                          default=None,
+                          dest='accelerators'
+                          )