[LIMA_LAUNCHER][LIMA2_TANGO] Add merged_executable option

* It is mandatory for single-process configurations

config/lima_launcher/lima2_tango/id00/simulator_ahoms0_legacy.json

@@ -8,7 +8,8 @@
         "lima2_tango": {
             "plugin": "simulator",
             "processing": "legacy",
-            "instance": "simulator_ahoms0"
+            "instance": "simulator_ahoms0",
+            "merged_executable": true
         },
         "environment": {
             "*": {

config/lima_launcher/lima2_tango/id00/simulator_sam_legacy.json

@@ -8,7 +8,8 @@
         "lima2_tango": {
             "plugin": "simulator",
             "processing": "legacy",
-            "instance": "simulator_sam"
+            "instance": "simulator_sam",
+            "merged_executable": true
         },
         "environment": {
             "*": {

scripts/lima_launcher

@@ -172,9 +172,12 @@ def lima2_get_executables(tango_config, args):
     proc = tango_config.get('processing', '')
     if not proc:
         raise ValueError('Missing lima2_tango processing definition')
-    merged = f'lima2_{plugin}_{proc}'
-    ctrl = f'lima2_{plugin}_ctrl'
-    recv = f'lima2_{plugin}_{proc}_recv'
+    merged = tango_config.get('merged_executable', False)
+    if merged:
+        ctrl = recv = f'lima2_{plugin}_{proc}'
+    else:
+        ctrl = f'lima2_{plugin}_ctrl'
+        recv = f'lima2_{plugin}_{proc}_recv'
     return dict(merged=merged, ctrl=ctrl, recv=recv)
 
 
@@ -199,9 +202,8 @@ def launch_lima2_tango(config, args):
     if remote_control or remote_recvs:
         raise ValueError('Remote servers not supported yet')
 
+    mpi_cmds = [f'-n 1 {{ctrl}} {instance}'.format(**execs)]
     if nb_recvs > 0:
-        mpi_cmds = [f'-n 1 {{ctrl}} {instance}'.format(**execs)]
-
         def get_recv_cmd(recv_config):
             nb_recvs = recv_config.get('nb_receivers', 1)
             numa_cmd = ''
@@ -213,8 +215,8 @@ def launch_lima2_tango(config, args):
             return f.format(**execs)
 
         mpi_cmds += [get_recv_cmd(c) for c in recvs_config]
-    else:
-        mpi_cmds = [f'-n 1 {{merged}} {instance}'.format(**execs)]
+    elif not execs['merged']:
+        raise ValueError('Single-processr config requires merged_executable')
 
     environ_config = config.get('environment', {})
     with Environment(environ_config, args=args) as env: