CPU Usage when acceptNewConnections

Fun Bobby · Post by **Fun Bobby** » 08 Sep 2010, 13:52

Hi there,

visual vm shows me that most cpu usage (>50%) happens in it.gotoandplay.smartfoxserver.SmartFoxServer.acceptNewConnections().

Can you tell me what happens here behind the scenes? Or does it enclude further methods calls.

Best regards,

BigFIsh · Post by **BigFIsh** » 08 Sep 2010, 19:24

You could try increasing your SysHandlerThreads by 1 as I think the 'connection' stuff is handled by the System Handler. More info via http://www.smartfoxserver.com/docs/docP ... Safety.htm

Post by **Lapo** » 09 Sep 2010, 21:33

Visual VM sorts all methods by their resource usage. The fact that one particular method is taking 50% does not present any particular problem, unless you are investigating a performance issue.
Also these values vary a lot depending on what the server is doing at the moment of the measurement.

It's like saying that, under your OS (maybe Win or MacOS), Skype is taking 2% of the CPU on a total of 4% of busy CPU. That's 50% of the CPU, but it's not a problem.

Fun Bobby · Post by **Fun Bobby** » 12 Sep 2010, 16:36

@lapo: yes thatÂ´s clear. but we have some load on the servers and iÂ´m trying to reduce it. So i am just want to now what is going on there in detail on what can be done to optimize this.

Post by **Lapo** » 14 Sep 2010, 09:30

That's the process that "welcomes" the users that are connecting. There's not much to be optimized there.
Are you sure that's the process that takes more CPU than anything else? I find this very weird. How long did you monitor the JVM? What's the load on the server?
Is this a dedicated machine or does it run more services?( Http, DBase etc... )

Fun Bobby · Post by **Fun Bobby** » 23 Sep 2010, 15:08

it is a dedicated maschine running only the sfs server with 12 cpuÂ´s.
the load on the server is about 0.8-1.2

here is a snapshot of the vm after about 20min sampling

Post by **Lapo** » 24 Sep 2010, 13:43

the load on the server is about 0.8-1.2

What do you mean by load? Do you refer to CPU usage or what else?

Fun Bobby · Post by **Fun Bobby** » 24 Sep 2010, 18:45

yes i mean 80%-120% from the theoretical 1200% of the 12 cpus

Post by **Lapo** » 25 Sep 2010, 06:28

It would help a lot if instead of providing small bits of information you could explain clearly what the problem is. At this point I am a little lost at understanding what we are looking for.

If your CPU uses less than 10% of it's overall capacity it is clear that it's not not running out of resources.
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