nodebb slows down

[sanatisharif]

I just changed Varnish configuration.I added these three blocks:
at the begining:

sub vcl_init {                                                                                                                                                    
    new nodebb = directors.round_robin();                                                                                                                         
    nodebb.add_backend(nodebb01);                                                                                                                                 
    nodebb.add_backend(nodebb02);                                                                                                                                 
    nodebb.add_backend(nodebb03);                                                                                                                                 
}  

and in the middle:

# Pipe websocket connections directly to Node.js                                                                                                            
      if (req.http.Upgrade ~ "(?i)websocket") {                                                                                                                   
         set req.backend_hint = nodebb.backend();                                                                                                                 
         return (pipe);                                                                                                                                           
      } 

set req.backend_hint = forum;                                                                                                                     
			if (req.url ~ "^/socket.io/") {                                                                                                               
			  set req.backend_hint = nodebb.backend();                                                                                                    
			  return (pipe); # return pass seems not working for websockets                                                                               
			} 

[julian]

What's the swap config like on your machine?

[sanatisharif]

@julian I don't know, please tell me how can I know that?
We are using debian 8 on SSD hard drive with 16GB memory and 24 core(intel xenon) cpu that serve multiple php websites and only one nodejs app (=NodeBB) .

I have checked the server usage we are using 8G memory and 50% cpu usage at most!(in worse case )

[julian]

@sanatisharif That is quite peculiar. I have not seen these symptoms before. NodeBB has always been fairly snappy and does not slow down with time...

[sanatisharif]

@julian maybe nodebb acts like this because of varnish configs.

I have changed it to hash directors instead of round_robin with 'client.identifier' as ID some of our problems gone but users complicate that some times our comunity is very slow!

sub vcl_init {                                                                                                                                                    
    new nodebb = directors.hash();                                                                                                                         
    nodebb.add_backend(nodebb01);                                                                                                                                 
    nodebb.add_backend(nodebb02);                                                                                                                                 
    nodebb.add_backend(nodebb03);                                                                                                                                 
}

set req.backend_hint = nodebb.backend(client.identity);

[sanatisharif]

Also when I checked varnish log dozens of request will be passed(MISS) so we can have better config for varnish.

[julian]

@sanatisharif said in nodebb slows down:

We are using debian 8 on SSD hard drive with 16GB memory and 24 core(intel xenon) cpu that serve multiple php websites and only one nodejs app (=NodeBB) .

How many NodeBB processes are you running? Are they utilising a lot of CPU?

[sanatisharif]

@julian said in nodebb slows down:

@sanatisharif said in :

We are using debian 8 on SSD hard drive with 16GB memory and 24 core(intel xenon) cpu that serve multiple php websites and only one nodejs app (=NodeBB) .

How many NodeBB processes are you running? Are they utilising a lot of CPU?

I don't know, please tell me how can I know that?

[julian]

You can check top for that.

[accalia]

@sanatisharif said in nodebb slows down:

I don't know, please tell me how can I know that?

$> top

this will give you a bunch of statistics about the system, including that's running and how much CPU it is taking.

to find out how many processes of nodejs are running i would recommend using

#> ps aux |grep node

this will spit our information about all processes that have "node" in their command line. you'll probably get a few false positives but you should be able to identify how many of those are nodebb easily enough.