Perf test: don't send ack msg after recv cp data

mpi/src/mpi_failure_tolerance/starpu_mpi_checkpoint.c

@@ -232,7 +232,7 @@ int starpu_mpi_submit_checkpoint_template(starpu_mpi_checkpoint_template_t cp_te
 					// The callback needs to do nothing. The cached one must release the handle.
 					_recv_internal_data_stats(arg);
 					starpu_data_dup_ro(&arg->copy_handle, arg->handle, 1);
-					starpu_data_acquire_cb(arg->copy_handle, STARPU_R, _recv_internal_dup_ro_cb, arg);
+					//starpu_data_acquire_cb(arg->copy_handle, STARPU_R, _recv_internal_dup_ro_cb, arg);
 					// The callback need to store the data and post ack send.
 				}
 				break;