Fix monitor flush.

Only print version information for one process.

mbtrack2/__init__.py

@@ -32,6 +32,8 @@ except:
 
     dirty = False
 
+
+def print_version():
     print(("mbtrack2 version " + __version__))
     if dirty:
         print("(dirty git work tree)")
@@ -46,3 +48,13 @@ print(
         "[2] A. Gamelin, W. Foosang, and R. Nagaoka, “mbtrack2, a Collective Effect Library in Python”, presented at the 12th Int. Particle Accelerator Conf. (IPAC'21), Campinas, Brazil, May 2021, paper MOPAB070."
     )
     print("\n")
+
+
+try:
+    from mpi4py import MPI
+    comm = MPI.COMM_WORLD
+    rank = comm.Get_rank()
+    if rank == 0:
+        print_version()
+except:
+    print_version()

mbtrack2/tracking/monitors/monitors.py

@@ -197,7 +197,6 @@ class Monitor(Element, metaclass=ABCMeta):
             self.file[
                 self.group_name][key][slice_tuple] = self.__getattribute__(key)
 
-        self.file.flush()
         self.write_count += 1
 
     def to_buffer(self, object_to_save):
@@ -944,7 +943,6 @@ class WakePotentialMonitor(Monitor):
                          self.buffer_size] = self.__getattribute__("dipole_" +
                                                                    dim)
 
-        self.file.flush()
         self.write_count += 1
 
     def track(self, object_to_save, wake_potential_to_save):
@@ -1304,7 +1302,6 @@ class BunchSpectrumMonitor(Monitor):
                               self.buffer_size:(self.write_count + 1) *
                               self.buffer_size] = self.coherent_o
 
-        self.file.flush()
         self.write_count += 1
 
     def get_incoherent_spectrum(self, positions):