Public bug reported:
neutron-openvswitch-agent' rpc_loop loops every 2 seconds by default.
In every loop, the function invocation will do every time: _agent_has_updates
-> polling_manager.is_polling_required -> self._monitor.has_updates ->
self.is_active() -> self.pid -> utils.get_root_helper_child_pid ->
find_child_pids -> execute 'ps --ppid <pid> -o pid=' command.
The command ('ps --ppid <pid> -o pid=') execution is heavy especially for high
load server, I have 800 HA vRouters in my network node. Every time I use top
command to see server load, I will always find ps process with high CPU usage,
and the every rpc_loop will takes 8+ seconds according to the
neutron-openvswitch-agent log.
So we need to find a way to avoid this invocation.
In class AsyncProcess, we can get the pid when spawn the child process
to avoid getting pid every time using ps command.
** Affects: neutron
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1663465
Title:
[performance improvement] update neutron-openvswitch-agent's
AsyncProcess
Status in neutron:
New
Bug description:
neutron-openvswitch-agent' rpc_loop loops every 2 seconds by default.
In every loop, the function invocation will do every time: _agent_has_updates
-> polling_manager.is_polling_required -> self._monitor.has_updates ->
self.is_active() -> self.pid -> utils.get_root_helper_child_pid ->
find_child_pids -> execute 'ps --ppid <pid> -o pid=' command.
The command ('ps --ppid <pid> -o pid=') execution is heavy especially for
high load server, I have 800 HA vRouters in my network node. Every time I use
top command to see server load, I will always find ps process with high CPU
usage, and the every rpc_loop will takes 8+ seconds according to the
neutron-openvswitch-agent log.
So we need to find a way to avoid this invocation.
In class AsyncProcess, we can get the pid when spawn the child process
to avoid getting pid every time using ps command.
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https://bugs.launchpad.net/neutron/+bug/1663465/+subscriptions
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