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2019-05-20 01:05:12 -0500 marked best answer controller_spawner node missing

I want to simulate many uavs in gazebo, when I launched 20uavs in gazebo, I found 17th-20th uav can't be controlled. I checked the rqt_graph and found that the node /gazebo had subscribed all uavs' topic (/pose_action) but the last four. So I want to know is there any limitation on topics a node can subscribe?

update1: I found 17th-20th uavs didn't have the topic "cmd_vel". On the other hand, I checked the rqt_graph and found that the node /gazebo had subscribed all uavs' topic (/command/pose) but the last four. I checked the log and found that the four uavs' log had the following warning:

Controller Spawner couldn't find the expected controller_manager ROS interface.

But other uavs all correctly load controller_manager and upload the controller. I had tried many times and sometimes there were 5 wrong and sometimes 3 and etc. Why some of them can't?

update2: I also found the four uavs' node (controller_spawner) were not created.

2018-04-12 09:26:58 -0500 edited question controller_spawner node missing

controller_spawner node missing I want to simulate many uavs in gazebo, when I launched 20uavs in gazebo, I found 17th-2

2018-04-12 09:25:33 -0500 received badge  Organizer (source)
2018-04-12 09:24:18 -0500 commented question Controller Spawner couldn't find the expected controller_manager ROS interface.

OK, thank you.

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2018-04-12 09:22:21 -0500 edited question controller_spawner node missing

controller_spawner node missing I want to simulate many uavs in gazebo, when I launched 20uavs in gazebo, I found 17th-2

2018-04-12 09:22:21 -0500 received badge  Editor (source)
2018-04-12 09:17:52 -0500 edited question controller_spawner node missing

How many topics can a node subscribe? I want to simulate many uavs in gazebo, when I launched 20uavs in gazebo, I found

2018-04-12 09:13:17 -0500 commented question Controller Spawner couldn't find the expected controller_manager ROS interface.

Yeah, it's the same problem but I found it is not the number of topics that matters, so I think it is a new problem. May

2018-04-12 08:32:53 -0500 asked a question Controller Spawner couldn't find the expected controller_manager ROS interface.

Controller Spawner couldn't find the expected controller_manager ROS interface. I want to simulate many uavs in gazebo,

2018-04-11 21:43:36 -0500 received badge  Supporter (source)
2018-04-11 21:42:58 -0500 commented question /cmd_VEL topic is missing

I had the same problem when I tried to simu multi-uav with hector. Some of the uavs' "cmd_vel" were missing while the ot

2018-04-11 07:08:38 -0500 commented answer controller_spawner node missing

@gvdhoorn, it is not always 16. If we want to simu 30 uavs, there are just 9 or 14 or 11 etc uavs connected.

2018-04-11 07:05:24 -0500 commented answer controller_spawner node missing

Thank you but it toled me "lsof: WARNING: can't stat() tracefs file system /sys/kernel/debug/tracing ,Output information

2018-04-10 13:59:04 -0500 received badge  Notable Question (source)
2018-04-10 06:29:18 -0500 commented answer controller_spawner node missing

I had changed the ulimit by ulimit -n 20480 before, it seemingly didn't work. Besides, when I try lsof -P {PID} , it say

2018-04-10 06:29:02 -0500 commented answer controller_spawner node missing

I had changed the ulimit by ulimit -n 20480 before, it seemingly didn't work. Besides, when I try lsof -P {PID} , it say

2018-04-10 06:26:38 -0500 commented answer controller_spawner node missing

I had changed the ulimit by ulimit -n 20480 before, it seemingly didn't work. Besides, when I try lsof -P {PID} , it say

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2018-04-10 03:27:17 -0500 received badge  Popular Question (source)
2018-04-09 22:18:33 -0500 asked a question controller_spawner node missing

How many topics can a node subscribe? I want to simulate many uavs in gazebo, when I launched 20uavs in gazebo, I found

2017-11-17 07:32:37 -0500 asked a question About hector_quadrotor

About hector_quadrotor I met with a problem when I tried to follow the tutorial http://wiki.ros.org/hector_quadrotor/Tut